sheila.dwyer@LIGO.ORG - posted 19:22, Saturday 13 August 2016 - last comment - 16:55, Sunday 14 August 2016(29089)
BS oplev glitches
Our DRMI lock times have been a little long in the last 2 days, it seems like the beam splitter optical lever is glitching. The attached screenshot shows a PRMI lock where the BS oplev damping is on for the first minute, you can glitches in both POP90 and POP18, when the oplev damping gain is ramped to 0 the glitches go away although there are some oscillations in the build up. Turning the oplev back on brings back the glitches.
Images attached to this report
Comments related to this report
The BS oplev was getting worse and making locking worse, so we went to the floor and adjusted the knob a little but (about 1/10 th of a turn clockwise). It seems to be better but is probably worth checking on tuesday.