ess.freia.mcstas.wfm_choppers

ess.freia.mcstas.wfm_choppers()

Construct the fixed WFM cascade used by the initial FREIA simulations.

Returns three bandwidth disks and five pulse-shaping/frame-overlap disks, each of the latter with seven openings. Settings are independent of the input file; a fresh set of disks is returned on each call.

Positions are in the simulation’s global frame, with the source at the origin. The analytical cascade projects them onto the z axis, approximating the curved guide and finite beam width by a central ray.

Return type:

DiskChoppers[TypeVar(RunType)]