find_dty_for_beam_xy#

anri.geom.find_dty_for_beam_xy(v_sample, k_in_lab, omega, wedge, chi, y0)[source]#

Find the dty value required to make the beam intersect a specific point v_sample at a given omega.

This is only valid for the scanning case (beam can be approximated as a ray).

Parameters:

  • v_sample (Array) – [3] Vector in sample coordinates

  • k_in_lab (Array) – [3] Incoming wave-vector in lab frame

  • omega (float) – Omega motor value (degrees)

  • wedge (float) – Wedge motor value (degrees)

  • chi (float) – Chi motor value (degrees)

  • y0 (float) – The true value of dty when the rotation axis (untilted by wedge, chi) intersects the beam

Returns:

dty_required (float) – dty value that brings v_sample into beam at angle omega