Reports until 20:33, Monday 27 November 2017
H1 SUS
betsy.weaver@LIGO.ORG - posted 20:33, Monday 27 November 2017 - last comment - 09:01, Tuesday 28 November 2017(39540)
More alignment time spent, little progress

Betsy, Keita, Kissel, Cheryl

We spent all morning aligning the PSL beam from the IMs through the MC bypass, PR3, PR2, PRM, BS, ITMs, and back reflections from the ITMs reverse to PRM.  We broke for a late lunch only to come back and find things misaligned again for unknown reasons.  We spent a few more afternoon hours on this but will have to restart again tomorrow, since it seems we need to align the entire chain of 12+ suspensions in one foul swoop and we ran out of steam today.

 

Also to note, PR3 was fussy to use today - we couldn't get it to damp in all 6 DOFs and think we tracked it down to strange BIO settings which may or may not be stuck.  Didn't have time to diagnose...

Comments related to this report
jeffrey.kissel@LIGO.ORG - 09:01, Tuesday 28 November 2017 (39541)
Link 

D. Barker, J. Kissel, R. McCarthy, V. Sandberg

Problem with PR3 is confirmed to be a stuck relay switch on the T3 OSEM of PR3. See 39527 and/or FRS ticket 9497.

Richard confirms that this requires a swap of the coil driver, so we've elected to punt the fix until later, since we have a functional solution.