DMSC Integration Testing

Test: nexusfiles-scipp|dream|dream_read_choppers_to_disk_choppers|pulse_shaping_chopper1

2026-09-25 00:23:22 [ 21474 ]: failed

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7efc09c67e00>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022379.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7efc631e85e0>
check_disk_chopper = <function _check_disk_chopper at 0x7efc0b731940>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-24 10:10:44 [ 21461 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f8a7cb1dca0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022299.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f8ad620c5e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f8a7e721940>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-24 00:25:25 [ 21459 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f745cc6d670>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022249.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f74b62cc5e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f745ec75940>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-23 16:26:12 [ 21457 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f39476c2ae0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022209.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f39a713c5e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f394f305940>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-23 16:14:27 [ 21456 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f701ce95550>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022209.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f70788b85e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f7020c61800>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-23 13:44:08 [ 21452 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fcdecc9bec0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022189.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fce462105e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fcdee641940>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-23 00:17:46 [ 21450 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f991b31ce60>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022119.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f996ef02e80>
check_disk_chopper = <function _check_disk_chopper at 0x7f991cac58a0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 16:48:29 [ 21447 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7ff51f54f560>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022069.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7ff578aa45e0>
check_disk_chopper = <function _check_disk_chopper at 0x7ff520c8da80>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 16:05:46 [ 21446 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fb55bef3710>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022069.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fb5b54cc5e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fb55d9f5a80>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 15:53:18 [ 21445 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fa1d7374620>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022059.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fa2309005e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fa1d8ab1940>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 12:13:17 [ 21443 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fa2e90ebdd0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022039.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fa33c5eee80>
check_disk_chopper = <function _check_disk_chopper at 0x7fa2ea3498a0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 12:20:56 [ 21442 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f9bf663d100>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022039.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f9bf9bd9580>
check_disk_chopper = <function _check_disk_chopper at 0x7f9bf7d45620>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 12:10:56 [ 21441 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f30447be210>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022039.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f304830d580>
check_disk_chopper = <function _check_disk_chopper at 0x7f3046b4d4e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 10:30:33 [ 21437 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f9c3a710a70>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022029.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f9c3dd51580>
check_disk_chopper = <function _check_disk_chopper at 0x7f9c3c2554e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 10:04:39 [ 21436 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f4fcf3c65d0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022029.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f4fd2831580>
check_disk_chopper = <function _check_disk_chopper at 0x7f4fd0b354e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 09:31:52 [ 21435 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fb74c21e9f0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00022029.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fb75f0f5580>
check_disk_chopper = <function _check_disk_chopper at 0x7fb75d861620>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-22 00:17:42 [ 21424 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f43e9c974a0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021969.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f43ec7714e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f43eae89440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-21 12:42:20 [ 21409 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fdcb816f9b0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021905.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fdd13194540>
check_disk_chopper = <function _check_disk_chopper at 0x7fdcbb511580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:162: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:30: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-21 12:32:23 [ 21408 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f43d8000110>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021905.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f43db6ed4e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f43d98a5440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-21 10:53:17 [ 21405 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f1f76bd9370>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021895.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f1f79e0d4e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f1f78315580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-21 00:17:57 [ 21403 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fed33889af0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021835.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fed36d314e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fed34ead440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-20 00:18:41 [ 21401 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f7277e2eff0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021695.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f727b60d4e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f727999d440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-19 00:17:36 [ 21400 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fbf162c0560>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021555.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fbf18d514e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fbf16efd580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-18 16:26:07 [ 21398 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f8184fdab70>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021515.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f81885854e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f818690d440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-18 00:18:06 [ 21379 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fea438ea6c0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021415.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fea474f94e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fea45895580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-17 00:17:58 [ 21370 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f108bd5b500>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021275.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f108f7214e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f108da6d580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-16 00:19:47 [ 21361 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f0ae74a9100>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00021125.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f0aeab314e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f0ae8c8d440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-15 00:18:46 [ 21359 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fe34fea8b00>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020985.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fe352b014e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fe350ff5580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-14 11:34:05 [ 21340 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f770a5d5ac0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020915.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f770d0554e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f770b635580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-14 11:02:30 [ 21337 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f881df65550>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020895.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f8821b294e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f881fea5580>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-14 09:49:37 [ 21336 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f99990d66f0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020895.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f999c5314e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f999a6f5440>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-14 09:39:08 [ 21335 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fdaa19a2d50>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020895.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fdacd7d23e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fdaa34877e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-14 00:24:07 [ 21334 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f07ab10e420>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020835.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f07d75ca3e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f07ad76f6a0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-13 00:20:24 [ 21333 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7fe80dae69f0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020705.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7fe83910a3e0>
check_disk_chopper = <function _check_disk_chopper at 0x7fe80f43b7e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-12 00:17:36 [ 21332 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f94bdaeeed0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020565.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f94ebdee3e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f94bf1e77e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-11 00:17:56 [ 21313 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f1054010200>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020409.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f10855ea3e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f10560bf7e0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:352: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:686: DimensionError

2026-09-10 00:18:51 [ 21280 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:676: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f33562453d0>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020269.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f3381dca3e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f33569d16c0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:343: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:676: DimensionError

2026-09-08 18:27:10 [ 21262 ]: failed

View job log here

scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:676: DimensionError

Full output

chopper_name = 'pulse_shaping_chopper1'
workflow = <sciline.pipeline.Pipeline object at 0x7f4e7160a000>
coda_nexus_file_path = PosixPath('/ess/data/coda/999999/raw/coda_dream_999999_00020196.hdf')
to_disk_choppers = <function _to_disk_choppers at 0x7f4ea4cea3e0>
check_disk_chopper = <function _check_disk_chopper at 0x7f4e742296c0>

    @pytest.mark.parametrize(
        "chopper_name",
        [
            "T0_chopper",
            "band_chopper",
            "overlap_chopper",
            "pulse_shaping_chopper1",
            "pulse_shaping_chopper2",
        ],
    )
    def test_dream_read_choppers_to_disk_choppers(
        chopper_name: str,
        workflow: sciline.Pipeline,
        coda_nexus_file_path: Path,
        to_disk_choppers: Callable,
        check_disk_chopper: Callable,
    ) -> None:
        workflow[Filename[SampleRun]] = coda_nexus_file_path
        choppers = workflow.compute(RawChoppers[SampleRun])
    
>       disk_choppers = to_disk_choppers({chopper_name: choppers[chopper_name]})
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/dream/dream_load_nexus_test.py:170: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/nexusfiles-scipp/conftest.py:89: in _to_disk_choppers
    key: DiskChopper.from_nexus(
.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:343: in from_nexus
    frequency = _get_0d_variable(chopper, 'rotation_speed_setpoint')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

dg = {'beam_position': <scipp.Variable> ()    float64            [deg]  0, 'type': <DiskChopperType.single: 'Chopper type s...       [m]  (0, 0.7, -70.405), 'transform': <scipp.Variable> ()  translation3              [m]  (0, 0.7, -70.405), ...}
name = 'rotation_speed_setpoint'

    def _get_0d_variable(
        dg: Mapping[str, sc.Variable | sc.DataArray], name: str
    ) -> sc.Variable:
        if (val := dg.get(name)) is None:
            raise ValueError(f"Chopper field '{name}' is missing")
    
        msg = (
            "Chopper field '{name}' must be a scalar variable, {got}. "
            "See the chopper user-guide for more information: "
            "https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html"
        )
    
        if isinstance(val, sc.DataArray):
            val = val.data
        if not isinstance(val, sc.Variable):
            raise TypeError(msg.format(name=name, got=f'got a {type(val)}'))
        val = val.squeeze()
        if val.ndim != 0:
>           raise sc.DimensionError(
                msg.format(name=name, got=f'got a {val.ndim}d variable')
            )
E           scipp._scipp.core.DimensionError: Chopper field 'rotation_speed_setpoint' must be a scalar variable, got a 1d variable. See the chopper user-guide for more information: https://scipp.github.io/scippneutron/user-guide/chopper/processing-nexus-choppers.html

.tox/nexusfiles-scipp-dream/lib/python3.12/site-packages/scippneutron/chopper/disk_chopper.py:676: DimensionError