H1 had a ~46Hr lock that ended toward the end of Jim's shift. He noted DRMI was looking pretty ugly. I waited DRMI a little, but eventually gave Sheila's new PRMI procedure a try, but POP18 & POP90 remained at a flat zero and PRMI never locked. So went through the Initial Alignment procedure (I went slow & took notes since this is something we do rarely.). Alignment was and getting to NOMINAL_LOW_NOISE were straightforward.
- H1 was down for ~2hrs (6:30 - 8:34).
- 1hr was alignment (PRMI & Initial), and 1hr was locking
- H1 currently in Observation at ~75Mpc
Reason for Lockloss?
I saw nothing obvious from seismic signals when I walked in, everything quiet! Jim mentioned ASAir/OMC video spots took an odd move prior to lockloss. H1 was trending down over 6hrs before the lockloss, and Jim mentioned this could be the RF45 issue which has been coming up.
Initial Alignment Notes:
-
ALS locking, no issues
- Comm beatnote ~4.7dBm
- video0 was super slow! So, it was slow to watch control signals settle (video0 was rebooted after getting to Observation Mode)
Accidental Slip Out Of Observation Mode: 9:04:15 - 9:04:33
While making the entry above and updating the Initial Alignment wiki, I wanted to look at a pull-down of an ISC Guardian node. Clicking on the ALS_YARM node pull-down dropped H1 out of Observation & into Commissioning. (after cursing, I quickly checked things and took H1 back to Observation)
(I didn't bother touching the Observatory Mode button during this short slip.)