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Virgo Runs (O3)
berni - 22:59 Sunday 01 December 2019 (47828) Print this report
Operator Report - Afternoon shift

ITF found in Science mode.
It unlocked at 21:13:59 UTC and the problem seems to be due to missing data for all the ISYS signals, see plot1.
It relocked at second attempt, Science mode at 22:50 UTC.

Guard tours (times in UTC)

  • from 14:00 to 14:30;
  • from 16:10 to 16:40;
  • from 18:20 to 18:50;
  • from 20:10 to 20:40;

Air Conditioning
In the second plot you can see a trend of some relevant signals affected by the problem on the air conditioning machine occurred Friday night.

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chiummo - 9:20 Monday 02 December 2019 (47830) Print this report

Follow-up of recovery after the HVAC failure:

Room temperature in the laser lab (and hosted benches) still experiencing the tail of a long transient. BPC horizontal corrections slowly drifting to compensate for the beam drifting on the sensors (not worrying, to be monitored). PMC seems to experience a little misalignment (Laser Amplifier power slightly increasing while PMC transmission is getting slightly worse), although from the reflected power the behavior is not vey clear. To monitor a possible increase of glitches related to the PSTAB if the misalignment of the PMC gets worse.

Overall input power for the interferometer decresed by 2%, to be re-checked after the steady state of the temperature is achieved.

For the moment, no urgent actions are needed from ISYS point of view, situation still under monitoring.


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