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Virgo Runs (O3)
Nenci - 23:00 Sunday 21 July 2019 (46447) Print this report
Operator Report - Afternoon shift

During the shift the ITF unlocked three times, always due to the IMC trasmission. The unlock occurred at 15:01 UTC isn't as the usual "fast unlock" (see the picture attached).  When locked, the BNS Range ~46 Mpc.

Infrastructure / ACS

PyServoHVAC_DET red flags on DMS since yesterday at 21:00 UTC. I tried to disable/enable the servo and stop and restart the process PyHVAC without success, after I tried to the restart also BACNetServer. Standard state restored at 18:55UTC.

Guard Tour (UTC)
13:13 - 13:40
14:52 - 15:20
16:55 - 19:25
18:57 - 19:32

Oncall events

Electricity
(20-07-2019 06:00 - 20-07-2019 22:00) Other
Status: Ended
Description: UPS1 TB off - the expert informed us that the UPS will be restarted tomorrow afternoon and, at this moment, is not critical for the ITF.

Images attached to this report
Comments to this report:
cleva - 10:03 Monday 22 July 2019 (46449) Print this report

- the first unlock behaves as a fast unlock with the EOM_CORR saturating a +1, quite unsual

- the second unlock 21 mn later fetaures also a fast unlock with EOM stuck at +1. In the second plot the ML_AC signal has been rescaled by a factor "-6" and we guess the correpsondance with EOM_CORR signal which has lead us to think many times that the EOM_CORR voltage induces some beam jitter on the transmitted beam (through the crystals at Brewstr angle) or some RAM.

- the third unlock is due to the IMC alignement drift (third plot)

 

Images attached to this comment
ruggi - 10:49 Monday 22 July 2019 (46450) Print this report

The third unlock is probably due to a problem of BPC. It looks like a failure of the board, as already happened in the past.

Images attached to this comment
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