cheryl.vorvick@LIGO.ORG - posted 17:27, Saturday 05 December 2015 - last comment - 20:24, Saturday 05 December 2015(23977)
H1 forensics - optical lever sum values for BS and ETMs and ITMs - glitching?
two plots attached: Dec. 1st and Dec. 5th - all while H1 is locked in Low Noise
Dec. 1st plot shows BS optical lever sum glitching by 200+ counts.
Dec. 5th plot of the same signals shows ETMY optical lever sum glitching 50-70 counts, and ETMX optical lever sum gltiching 200+ counts, but BS sum is now quiet and +/-25 counts from the mean sum value.
Is this glitching, or an artifact of something else, and could this be effecting the IFO's locking?
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Red herring... Variation in signal is a small percentage of the sum.