After an electrical cut, or just mysteriously, the fast shutter can be misaligned with respect to X-ray beam and data collection becomes impossible. There is a simple way to verify if it is the case:

  • put fluorescent screen after fast shutter into the beam: spec EXP> yagdin;
  • open Experimental hutch camera viewer here;
  • open safety shutter: button in BsxCuBE, or write 'shopen' in spec EXP;
  • open fast shutter: EXP> msopen, you should see a clear light on the fluorescent screen, close it: EXP> msclose, no light;
  • EXP> yagdout to take the fluorescen screen out of the beam.

If it is not the case, fast shutter has to be realigned: use alignment script (home search doesn't need beam)

  • EXP> home_triggered_fast_shutter

Test (msopen/msclose and ct) if behaving correctly.

Note that Fast shutter is during 'normal' operation in triggered mode (BTRIG 0 or 1 from MUSST), concequently if you want to move it as a motor (mv, dscan etc. in SPEC) one should take it out from this mode: EXP> disable_triggered_fast_shutter

Once you finish to play with 'sh' set it in position 0 (open) and put motor back into triggered mode: EXP> enable_triggered_fast_shutter