Sheila, Naoki, Vicky, Camilla
As we continue to see the nominal SQZ angle change lock-to-lock (attached BLRMs). We edited SQZ_MANAGER to scan sqz angle (takes 120s) every time the SQZ locks, i.e. every time we go into NLN.
In SQZ_MANAGER we have:
- Added a state FC_WAIT_FDS after SQZ ASC, which asks the FC to lock and waits up to 5 minutes (this used to be done in nominal state FDS).
- Changed the next nominal state to SCAN_SQZANG (120s scan to get best squeezing at 350Hz BLRMs, may still need improvements).
- This can be bypassed if we don't like this addition be removing the weighting from '('FC_WAIT_FDS', 'FREQ_DEP_SQZ', 3)'
- I added an LO_checker_FDS() to FC_WAIT_FDS and FDS to come back to FDS_READY_IFO if the LO unlocks to avoid copy-pasting code everywhere.
- SCAN_SQZANG still has paths to/from FDS so we can still request it whenever.
- Old and new graphs attached. svn commit 27520.
We tested this taking SQZ_MANAGER down and back up, it went though SCAN_SQZANG as expected and improved the SQZ by 1dB, range improved by ~10MPc.
We'll want to monitor that the change as SCAN_SQZANG may not give us the best angle at the start of the lock when SQZ is very variable. We expect this won't delay us going into observing as only added 120s and ISC_LOCK is often still waiting for ADS to converge during this time.
I have removed this change of path by removing thew weighting as we can see last night SCAN_SQZANG at the start of the lock took us to a bad squeezing once thermalized.
We weren't seeing this changing angular dependence as much before 77133 with the older PSAMS settings (8.8V,-0.7V) or (7.2V, -0.72V). Current (7.5V,0.5V). We think we should revert to the older setting.
