travis.sadecki@LIGO.ORG - posted 19:46, Monday 06 February 2017 - last comment - 20:47, Monday 06 February 2017(33946)
Lockloss 3:45 UTC
PI modes 26 and 9 were ringing up. Changing phase and gain weren't helping, so I started to diagnose if the BP filter had the correct values. I guess I took too long trying to figure out if the setting were correct and lock was lost.
Another lockloss at 4:33 UTC due to these two PI modes. I called Terra for some help, and she seemed to think that everything I was looking at was correct. Since this was the second lockloss due to these PI modes, I granted Terra remote access to have a second set of eyes on the issue. This time, I'm going to stop at a lower power state during locking to test the responsivity of the PI damping on the modes before ringing them up more.