The last few days we have been struggling to find a good alignment for locking the vertex, especially SRY. We found something that worked ok a few days ago but the corner ISIs all tripped yesterday and we lost that alignment. I have been moving the input and PR2 alignment by hand for awhile trying to maximise PRMI buildups, and have eventually found something that works. SRY locks straight away now and I can go through to DRMI_WFS_OFFLOADED with no issues. The builds ups with DRMI locked are now RF18~35 and RF90~16.
Cao and I are going to work on some phase camera tests for the rest of the day. We'll need to go on ISCT1 to do some realignment quickly and to switch it off at the end of the day, but we can run the phase camera remotely now from the control room so we won't be in there long.
In https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=52528 we took some phase camera images of the 9, 45 and carrier. We noticed the carrier looked pretty messy.
Interestingly, today after doing some realignment the carrier is looking much cleaner, attached are the 9 and carrier images. I've unwrapped the phase and adjusted the camera exposure and binning to get a better SNR on the carrier.