aLIGO LHO Logbook

H1 General (DetChar)

kentaro.mogushi@LIGO.ORG - posted 11:14, Monday 24 July 2017 - last comment - 15:39, Monday 24 July 2017(37740)

Thursday 20th 00:00 UTC - Sunday 23rd 23:59 UTC

The full report can be found on the detchar wiki: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20170720

Below I summarize the main highlights of this shift:

-The duty cycle was 78.5%, the range was stable around 53Mpc.
-We went to out of observation intentionally at 19:13UTC to dump violin mode on Thursday.
-The glitches around 20Hz at 10:00 UTC seem to be due to overflows in all of the test mass L2 coils
, perticularly the pitch motion of soft mode in cavity, similarly at 8:00UTC on Thursday.
-GRB alert occured at 01:49 UTC, 02:48 UTC, 04:31 UTC, 16:16 UTC and 21:11UTC.

Comments related to this report

jeffrey.kissel@LIGO.ORG - 15:39, Monday 24 July 2017 (37744)DetChar, ISC, Lockloss, SUS

Link

Note we also took the IFO out of observation at 1p PT local on Friday (Jul 21 2017 20:00:00 UTC) for planned maintenance and commissioning. Observation down time was 3 hours, and we were back up by July 22 2017 01:00 UTC.