aLIGO LHO Logbook

H1 PSL

peter.king@LIGO.ORG - posted 06:56, Tuesday 20 September 2016 - last comment - 11:28, Tuesday 20 September 2016(29824)

laser trip

This laser tripped this morning at around 03:00.  Found the NPRO power supply was off.  Suspected problem is either
a mains power glitch or the UPS for the NPRO power supply had a hiccup.

System came up okay except for the ISS, which I am guessing is related to changes made to the sensors as described
by Keita in a previous entry.

Comments related to this report

peter.king@LIGO.ORG - 06:59, Tuesday 20 September 2016 (29825)

Link

Attached is a plot of the temperature rise of the laser heads when the laser tripped.  The sudden rise in
temperature corresponds to when the laser tripped.

Images attached to this comment

thomas.shaffer@LIGO.ORG - 09:20, Tuesday 20 September 2016 (29830)

Link

Richard had me trend the PEM power channels and it definitely looks like there was something going on around that time. Oddly, I couldn't trend the full data though, it just gave me a line. So this is second trends of the mean.

Images attached to this comment

matthew.evans@LIGO.ORG - 11:28, Tuesday 20 September 2016 (29836)

Link

"System came up okay except for the ISS, which I am guessing is related to changes made to the sensors as described
by Keita in a previous entry."

This change was to the out of loop PD (PDA) and was not the cause of the ISS problems. The change was also reverted last night, so the ISS still needs fixing.