haocun.yu@LIGO.ORG - posted 19:01, Tuesday 14 June 2016 - last comment - 15:30, Wednesday 15 June 2016(27739)
Locklosses
Sheila, Haocun
We had lots of locklosses today, and some were probably caused by the side OSEM driving of the beamsplitter M1, as shown in the figures attached.
(H1:SUS-BS_M1_MASTER_OUT_SD_DQ & H1:SUS-BS_M1_DAMP_T_IN1_DQ)
Images attached to this report
Comments related to this report
It seems to have happened again at 22:20:12 UTC June 15th
Images attached to this comment
Tagging SUS and CDS.
Tonight I had a look at several other of these locklosses, and other than the one at 23:57:59 that Hoacun plotted, it seems mostly like the glitch in the side osem comes after the lockloss. Many of these locklosses seem to happen durring the CM board switching.
It does seem like it would be worth investigating this side osem issue, since we know that it causes at least some locklosses.