patrick.thomas@LIGO.ORG - posted 18:26, Thursday 15 December 2016 - last comment - 19:04, Thursday 15 December 2016(32616)
constant ETMY saturations
Verbal alarms started alerting that EY was saturating at 02:04 UTC. It has continued since. Attached is a plot of the L3 ESD drive signals for the last 2 hours. They have been growing. Is this the violin mode at 4.7 kHz that Keita and Cheryl were investigating?
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02:44 UTC Out of observing. Changed gain for H1:SUS-ETMY_L2_DAMP_MODE10 from 100 to 0.02. Turned off FM1 and turned on FM9 and FM10. 4.7kHz mode has come down and saturations have stopped. 02:59 UTC Back to observing.
Accepted SDF differences attached.
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