edmond.merilh@LIGO.ORG - posted 12:40, Thursday 07 November 2019 - last comment - 16:36, Thursday 07 November 2019(53069)
Lockloss and Recovery 01:08UTC 18:09
18:09 Lockloss
Re-lock attempt -1
18:11 ALSY needed aligning
18:23 FIND_IR starting
- no diff IR- offset in TRY_QPD_B_SUM
18:35 Lockloss - trying to play catch-up with diff slider
18:39 Re-lock attempt - 2
- DRMI was very misaligned; Guardian to PRMI - no lock; 20 minute timeout as per threshold protocol
19:10 Initial Alignment
19:25 IA complete
19:27 Re-Lock attempt - 3
19:52 Lockloss @ LOWNOISE_ASC
19:53 Re-Lock attempt -4
- after 2 minute I realized there was the offset in te Y QPD BSUM again (started FIND-IR @ 19:56)
20:06 lockloss
20:07 Re-Lock attempt- 5
20:37 NLN
Lock loss 1257185391
A very fast lock loss. I didn't see anything in the ASC signals (1st attachment), then I noticed that the squeezer lost lock just before the rest of the IFO (2nd attachment). I'm not sure how to tell if the squeezer losing lock was a cause or effect though.
Anther oddity is the slight jitter in H1:SUS-ETMX_L3_MASTER_OUT channel just before the lock loss. It seems to have large amounts of drive almost .4 seconds before. Out of time time to track down from where.
One more, I looked at H1:SQZ-LO_SERVO_CTRL_OUT_DQ and it loses it before the main IFO.