Reports until 17:20, Tuesday 03 September 2019
H1 SQZ
sheila.dwyer@LIGO.ORG - posted 17:20, Tuesday 03 September 2019 (51724)
Squeezer knocks us out of observing

The squeezer took H1 out of obseverving and the guardian could not relock the CLF loop.  The attached screenshot shows that there was extra intensity noise out of the laser at this time, shown in the attached screenshot.  I turned on the noise eater, the noise went away, we were able to relock the squeezer, and when turning the noise eater off again we stayed locked. 

Keita and Daniel trended the power out of the fiber from the PSL and saw that the polarization changed around 9 am local time, near the start of maintence. We used the half wave plate on the pico motor to restore the power on the fiber beatnote.  

Back in observing now.

Images attached to this report