Tonight's shift was dedicated to the ITF recovery.
We closed the PR angular loop in full bandwith in LN1, while the BS angular loop is only closed in drift control (put "1" instead of "2" in the BS.ramp_attribute("AATX(Y)_FLAG") in the ITF_LOCK.py) and we also slightly retuned the offsets.
The OMC1 lock didn't give much problems, but it was not possible to achieve the lock of the second OMC. We think it could be related to DARM handoff from B1s2 to B1: maybe, besides the "b1_pd_balance" there is some other value to be changed accordingly, but we are not sure.
SIDE notes: during the shift the ITF unlocked many times because of:
- fast unlocks
- PR misalignment
- earthquake, which excited the suspensions for about one hour
Since we couldn't reach LN3 we couldn't perform the scheduled negative DARM offset scan.