Reports until 22:36, Sunday 22 July 2018
H1 AOS
sheila.dwyer@LIGO.ORG - posted 22:36, Sunday 22 July 2018 - last comment - 14:43, Thursday 26 July 2018(43010)
PRMI build ups low

Craig, Sheila, Matt, Lisa

We went through an inital alignment and locked PRMI.  The build ups are about a factor of 3 lower than what we had in May, so we tried walking the alignment around a lot.  

For the initial alignment we had to do a few things:

Once we saw that our build up was not good, we decided to try to bring the beam back onto the POP QPDs (We think that this path was not modified during the vent, we used to be on the QPDs and now we are too high).  We moved IM4 to center in pitch on POPA, and then moved the X arm to get the green and red co-aligned.  This resulted in worse build ups in PRMI. 

We can see something on the PR2 camera, which could be scatter but we can't be sure what it is.  We attempted to minimize the camera sum after Matt adjusted the mask to zoom in on these spots, but this also resulted in lower build ups. 

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craig.cahillane@LIGO.ORG - 22:56, Sunday 22 July 2018 (43011)


		
		
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sheila.dwyer@LIGO.ORG - 23:06, Sunday 22 July 2018 (43012)

We started a VCO scan in single bounce with the OMC locked at 1216361323+60

This is for a whistle investigation.  It will run for 12 hours.  If you want to stop it from moving the IMC VCO in the morning, you can quit the matlab script running on opsws13

Edit: It looks like this ran from about  6:11 UTC July 22nd to about 15:50 UTC.  

sheila.dwyer@LIGO.ORG - 14:43, Thursday 26 July 2018 (43092)

For future reference, we had a PRMI lock with the beam on the POPA QPD at 5:38:57 UTC on July 23 2018