Set A-station slit aperture

Warning

STATUS: STUB. Placeholder for the procedure that satisfies the precondition a_slits_open of Detector Z-rail alignment to the beam (detector_z_rail_alignment). To be fleshed out as the procedure is implemented.

Name

set_a_slits

Source

Not yet implemented. Future location: procedures/set_a_slits.py in the 2bm-procedures repository.

Devices

Beamline components: A-station slits — the upstream beam-shaping slits whose downstream propagation produces the ~1 × 1 mm beam at sample / detector. Blade motors and composite Size/Centre PVs documented in item_020’s A-station section.

Preconditions

Enable beamline for beam (enable_beamline).

Parameters

size_h_mm (number > 0) — horizontal aperture. Default for detector_z_rail_alignment: 0.5 mm (so that propagation to the detector produces ≈ 1 × 1 mm at the sample / detector plane).
size_v_mm (number > 0) — vertical aperture. Default: 0.5 mm.
center_h_mm / center_v_mm (optional) — re-centring.

Steps

TBD. Drive blade motors or write composite Size PVs; wait for DMOV.

Postconditions

Satisfies:: a_slits_open
Predicate:: A_slit_H_size_RBV >= 0.5 AND A_slit_V_size_RBV >= 0.5 (PV names TBD — see item_020’s A-station block).

Failure modes

TBD.