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Reports until 16:35, Tuesday 27 August 2024
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jenne.driggers@LIGO.ORG - posted 16:35, Tuesday 27 August 2024 - last comment - 16:59, Tuesday 27 August 2024(79748)
OMC camerea shaking again

[RyanS, TJ, Jenne]

Some (but not all) of our recent locks have had significant jittering and shaking visible on the OMC Trans camera.  Since it's happening again this lock, I took a look at some of the channels that look at the trans camera readbacks.

The y-cursors are set to the max/min values of the m-trend from right now, when the camera is shaking.  I then scrolled to the recent lock (that ended with maintenance) and show that the variance in all of these channels was much lower in that past lock.

I'm still not sure what is causing this, but at least the size of the fuzz in any of these camera channels can help us see when it is / isn't happening.  My prime suspicion is a loop oscillation in the OMC length loop (that is based entirely on non-scientific gut feelings though).

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jenne.driggers@LIGO.ORG - 16:59, Tuesday 27 August 2024 (79751)

I don't see anything suspicious in the OMC-LSC_SERVO_OUT_DQ channel (the spectrum looks the same as last lock), so likely my unscientific gut feeling is wrong. 

The camera shaking is *not* visible in the AS_AIR camera though. 

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