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Reports until 09:19, Friday 09 June 2017
H1 General
corey.gray@LIGO.ORG - posted 09:19, Friday 09 June 2017 - last comment - 10:53, Friday 09 June 2017(36755)
H1 Trouble Progressing Beyond DRMI....

Do not really want to try an INITIAL ALIGNMENT, but have struggled a little for the last ~40min getting H1 to progress much beyond DRMI.

It's made it as far as DHARD WFS once, but all other times have been in and around DRMI, and when it drops out, it does so somewhat violently (AS camera spot swings wildly and the AS90_OVER_POP90 channel [gray on StripTool in front] has been huge.  

Just tried going step by step after DRMI & dropped out (wildly again) in the CARM_ON_TR step.  

Will try one more time and then will try an INITIAL ALIGNMENT.

Comments related to this report
jenne.driggers@LIGO.ORG - 10:53, Friday 09 June 2017 (36756)

Corey was also struggling with initial alignment.  It turns out this is the first time we've run an initial alignment since Wed evening, when I reset the green PZT pointing and green ITM camera setpoints. 

These seemed to be working okay for the Xarm, but not at all for the Yarm - the AS camera looked terrible, and moving the optics such that the camera error signal was small brought the green transmitted power down.  So, Vaishali and I undid those changes and put the initial alignment setpoints back to what they were before Wed.  We're doing this for both arms, since it doesn't make sense to have different alignments for the different arms.  Since we had to do it for the Yarm, we're also doing it for the Xarm.

Things are looking better now, so Corey is continuing with initial alignment.

EDIT: It occurs to me (just after it's too late for this lock, since we started increasing power) that I should have reset the green initial alignment setpoints at 2W, like DC readout.  Instead, I had done it while at full power on Wed night after the IFO was warm and toasty.  That's probably why the setpoints were not good for initial alignment this morning.  Ooopsies, sorry.  The current setpoints are close enough that the IFO is fine coming up without any help, so we'll leave it alone for now, and reset the initial alignment setpoints at 2W next time it's convenient.

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