edmond.merilh@LIGO.ORG - posted 09:44, Sunday 05 May 2019 - last comment - 13:38, Sunday 05 May 2019(49003)
May be interesting...
13:15UTC noticed H1IFO_RANGE.adl dipped into -1 Mpc and noticed momentary noise on DARM blrms shown below different from typical glitches.
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This started about 17:45UTC: Some Squeezer Noise Eater foolishness?
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Yes, this is the squeezer again. It can be diagnosed by a big comb appearing on most of the squeezer fast channels - I usually use H1:SQZ-LASER_IR_LF_OUT_DQ (first plot). A simple way to diagnose this might be to put up a running trace of H1:SQZ-LASER_IR_LF_OUTPUT, which is a 16 Hz channel. It gets noticeably wider when the noise appears (second plot).
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This all settled down ~ 18:05UTC
Just turn the noise eater off: Squeezer Overview -> click on the laser.
Will do, DS.