We re-enabled FC beam spot control, by enabling inputs to the H1:SQZ-FC_ASC_INJ_ANG_{P,Y} filter banks. Seemed to just work (see attached screenshot) - moves ZM3 to control the spot on the green QPD in filter cavity transmission (SQZ-FC_TRANS_A on SQZT8). Have not yet checked the centering, last done in May 2024 (see 77942 , 69276 , 69374 , 73777).
QPD offsets are set in the FC_ASC_INMATRIX filter banks, last column and row.
I set the flag in sqzparams.py (use_fc_beamspot_control = True), and reloaded SQZ_FC guardian so it will be used in the next locks.
Disabled FC beam spot control (use_fc_beamspot_control = False) and loaded SQZ_FC guardian. We can try that again later, beam should be closer to centered now.
FC had a hard time locking in this past lock (ending ~0100 UTC), so that lock didn't have squeezing injected. We first used sliders to set ZMs2-3 and FC1-2 back according to M1_DAMP_{P/Y}_INMONs, to a time during the last lock. FC alignment was still bad with slides set back (bad green tem00 trans, green vco not catching the lock stably).
Then see the attached scope for the QPD alignment that worked. Overall what we should have done: 1) bringing SQZ_MANAGER through DOWN first (I think that fixed something). 2) Setting ZM3+FC1 according to RLF QPDs in HAM7, then set FC2 according to green trans QPD (FC_QPD_TRANS_A) on SQZT8. Biggest move was moving FC2 Y by about +20 on the slider, which is a really big change for this one. With setting SUS back based on top mass osems, then green FC_REFL looked bad, and FC couldn't hand off the IR lock successfully. With the alignment looking good on all QPD's, the FC alignment looks stable (both FC_GR_TRANS and FC_GR_REFL), and I think FC should lock next time.
