aLIGO LHO Logbook

H1 General

jeffrey.bartlett@LIGO.ORG - posted 22:09, Wednesday 22 March 2017 - last comment - 23:03, Wednesday 22 March 2017(35028)

RF45 Noise Depressing Range

   For the past 45 minutes or so the RF45 noise has been elevated above the reference. The range is currently down into the upper 40s Mpc.

Comments related to this report

jeffrey.bartlett@LIGO.ORG - 22:52, Wednesday 22 March 2017 (35030)DetChar

Link

  Mike L. called to inquire about the RF45 issue. Per his suggestion, I've informed Keita of the situation. As there is nothing ops can do at this time, will continue to monitor.

keita.kawabe@LIGO.ORG - 23:03, Wednesday 22 March 2017 (35031)CDS, DetChar

Link

In the morning, let's replace the harmonic generator with a spare. If it still glitches it's probably not a glitchy harmonic generator.

In the past the harmonic generator was checked in the lab, but the "check" was for stationary noise and not the glitches (how can we "check" sporadic glitch that might or might not happen for a year?), and the same unit was put back in place.

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=21094