Virgo Logbook

Virgo Runs (O3)

magazzu - 15:06 Saturday 02 November 2019 (47515)

Operator Report - Morning shift

ITF found in Science, it unlocked at 9:47 UTC ( see attached plot #1 ). Relocked at the second attempt, back in Science mode from 10:26 UTC.
During the shift the Horizon suffered a series of drops that seems related to the PSTAB ( see attached plot #2 ).
ITF left locked.

Guard Tour
6:12 UTC - 6:43 UTC;
8:11 UTC - 8:38 UTC;
10:25 UTC - 10:58 UTC;
12:36 UTC - 13:04 UTC.

Sub-system reports

DAQ
- LockMoni restarted at 9:49 UTC after the unlock to update its configuration.
- lvalert_virgo restarted at 11:05 UTC after a crash.

Images attached to this report

47515_1572703063_20191102 PSTAB noise.gif

Comments to this report:

narnaud - 17:17 Saturday 02 November 2019 (47516)

DAQ
(...)
- lvalert_virgo restarted at 11:05 UTC after a crash.

That must have been a temporary connection problem between VPM and the server: lvalert_virgo is running since yesterday morning:

Process uptime: 1 day and 7h39m39s
/virgoLog/VirgoOnline/lvalert_virgo/lvalert_virgo_2019-11-01-08h37m02-UTC.log

cleva - 15:10 Monday 04 November 2019 (47533)

- The Pstab is requested to provide a large correction and ends up in saturations which trigger some glitches and possibly some horizon drops (see HF_CORR on plot1)

- The beam misalignment on the PMC is likely to increase the power fluctuations managed by the Pstab (see plot2)

Images attached to this comment