Virgo Logbook

Virgo Runs (O3)

berni - 15:00 Tuesday 28 January 2020 (48270)

Operator Report - Morning shift

ITF found in Science mode.
At 7:06 UTC ITF in Maintenance mode; below a list of the activities comunicated to the control room:
- vacuum and cleaning operations;
- cryotrap refill;
- check of the SWEB mulstisas (see next dedicated entry); to perform this activity the beam was blocked on the bench.
At 11:55 UTC all the maintenance activities were concluded and we started the recovery of the SWEB/ISYS; recovery still in progress...

Sub-system reports

Air Conditioning
UTA DET in "portata nominale" from 9:50 UTC to 10:20 UTC.

TCS
standard checks/refill of the TCS chillers.

Images attached to this report

48270_1580219985_Screenshot_2020-01-28 Plots for logbook report.png

Comments to this report:

gosselin, derossi, chiummo - 18:03 Tuesday 28 January 2020 (48273)

This morning, on request, we blocked the beam on the laser bench in order to let people work properly on SWEB.
When restoring the system we had some troubles to close the BPC loop because the corrections were too high.
We brought them back to values close to 0 and restore the system in its norminal value.

chiummo - 18:42 Tuesday 28 January 2020 (48274)

As a general remark, please consider that blocking the YAG beam on the laser bench implies a number of operations with possible non-negligible impact on the recovery time of the ITF, including but not limited to thermal load variation on the ISYS benches, and the risk of having the control loops not immediately in the optimal working point afterward. It should be considered as an option when other operations are discarded for some reasons, i.e. when safety of humans or equipments cannot be guaranteed in a different way, and should be planned in advance when possible.