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Reports until 05:35, Wednesday 25 December 2019
H1 General
yannick.lecoeuche@LIGO.ORG - posted 05:35, Wednesday 25 December 2019 (54106)
Post EQ alignment changes

At Cheryl's request, I've plotted the alignment of IM 1-3 OSEMs and IM4 transmission to look for alignment changes after our 6.3 EQ near Vancouver. The first plot shows the ISC_LOCK state, and the timespan covers two locklosses, the first being due to maintenance and the second due to the EQ. There are two vertical lines denoting spots where the IFO is unlocked but the optics should be damped.

It seems there were some large shifts in the IM alignment values, which may have contributed to our noisy re-locking process and our slightly decreased range (though microseism is also up a bit).

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