corey.gray@LIGO.ORG - posted 12:56, Saturday 05 December 2015 - last comment - 15:23, Saturday 05 December 2015(23974)
Mid Shift Summary: Mysterious Lockloss
19:56UTC (11:56amPST) H1 dropped out & no obvious reason why.
19:58 - 20:30 Lock Acquisition Part 1
Problems getting through CHECK_IR (about 3-4 attempts), but finally made it past this step.
Tried locking DRMI, but alignment looked bad. Tried locking PRMI, but no lock within 8min. Started Initial Alignment (took about 23min). Now giving Locking another go.
20:30-20:53 Initial Alignment
20:54 - current: Lock Acquisition Part 2
Comments related to this report
corey.gray@LIGO.ORG - 15:23, Saturday 05 December 2015 (23976)
After several attempts at locking DRMI, tried locking PRMI, but this also did not lock.
Attempted another alignment. ALS was already good, obviously. BUT for INPUT_ALIGN, the Xarm would not lock (had flashes up to 0.8). I raised the gain from 0.05 up to 0.2, and it would lock, but after taking back to 0.05, it would drop out of lock. I continued alignment without OFFLOADING for INPUT ALIGN.
Here I am back to locking, but it does not look great. Stuck in CHECK IR. I am going to find by hand, but when I look at the AS Port camera, I see the spot swinging in pitch every few seconds.
LVEA useism has been high for last 6hrs. It's currently at 0.9um/s. Not the worst period of useism, but certainly similar to other times when we had issues locking. (see plot of last 55 days).
Also running with all BSCs in their standard 45mHz configuration, EXCEPT for ETMx which Jim alogged about earlier.
Woes Continue
LVEA useism has been high for last 6hrs. It's currently at 0.9um/s. Not the worst period of useism, but certainly similar to other times when we had issues locking. (see plot of last 55 days).
Also running with all BSCs in their standard 45mHz configuration, EXCEPT for ETMx which Jim alogged about earlier.