ess.estia.conversions.theta#

ess.estia.conversions.theta(divergence_angle, sample_rotation)[source]#

Compute the reflection angle in the laboratory x-z plane.

The central reflected beam must be aligned with the detector reference direction. After alignment, the detector rotates by twice each change in sample rotation, with the other alignment rotations held fixed.

Parameters:

  • divergence_angle (Variable) – Signed angle of the outgoing ray from the detector reference direction.

  • sample_rotation (Variable) – Calibrated angle between the central reflected beam and the sample surface.

Returns:

Angle between the outgoing ray and the sample surface.