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Virgo Runs (O3)
amagazzu - 23:19 Wednesday 04 December 2019 (47855) Print this report
Operator Report - Afternoon shift

ITF found in Science Mode. It unlocked at 14:41 UTC due to saturation of the End Suspensions ( see attached plot #1 ).
Back at LOW_NOISE_3_SQZ at 15:03 UTC, Switched to Calibration mode to perform the weekly Calibrations:

From 15:03 UTC to 15:25 UTC - Angular Noise Injections;
From 15:26 UTC to 15:42 UTC - Longitudinal Noise Injections;
From 15:52 UTC to 15:55 UTC - PR optical Response Estimation;
From 15:42 UTC to 16:13 UTC - AA Tuning Test, performed by J. Brooks;
From 16:17 UTC to 17:51 UTC - CALIBRATED_DF_PCAL;

Due to a GW alert received during the last Calibration, in agreement with the Run Coordinator, I Set the ITF back in Science Mode at 17:55 UTC.
Switched to Adjusting mode from 19:10 UTC to 19:30 UTC to recovery the Vertical correction of SNEB before it would open the loops. Unfortunately during this operation the ITF unlocked at 19:30 UTC ( see attached plot #2 ).
ITF relocked at first attempt, back in Science Mode from 20:09 UTC.

Guard Tour
18:32 UTC - 19:04 UTC;
20:47 UTC - 21:14 UTC;

Other
Weekly check of the DMS shelved flags, see attached report.

Sub-system reports

ISC
In agreement with J. Brooks and M. Mantovani at 20:41 UTC I enabled the AATuning servo with 20 iterations. Loop in progress.

Oncall events

ISC
(04-12-2019 13:00 - 04-12-2019 15:20) From remote
Status: Ended
Description: Troubles on keeping ITF stable locked.
Actions undertaken: M. Mantovani investigated the issue of the locking stability of the ITF. No major issue were found.

SBE
(04-12-2019 19:15 - 04-12-2019 19:45) Operator on site with expert from remote
Status: Ended
Description: Since Yesterday afternoon the Vectical correction of SNEB increased ( see attached plot #3 ). The related flag became yellow at the beginning of the shift, reporting that the loops of the bench could open if the value became too big.
Actions undertaken: At 19:10 UTC I switched to Adjusting mode in order to move the vertical position of the bench, but when I tried to act on the motors I saw no feedback on the signals. I contacted the SBE Oncall ( A. Bertolini ) that guided me through the procedure. Using the motor #4 we were able to slowly return the value around 0, but the behavior of the movement was not linear, showing some sort of resistance ( see attached plot #4 ).

Images attached to this report
Comments to this report:
estevez, rolland - 10:13 Thursday 05 December 2019 (47858) Print this report

The GW alert received during the Calibration happened when injections on NE and WE mirror actuators were performed at the following frequencies:

NE 98.20 Hz, 908.20 Hz

WE 98.70 Hz, 908.70 Hz

Figure 1 shows at the top the injections with the CAL_*_MIR_Z_NOISE channels (the usual permanent calibration lines + the lines mentioned above), in the middle the coherence between these channels and Hrec_hoft_raw, at the bottom the coherence between these channels and Hrec_hoft. Note that there is coherence with Hrec_hoft at the injected calibration lines since the signal is very strong for calibration purpose.

Figure 2 shows the CAL_*_MIR_Z_NOISE in time from ~7 seconds before the event (GPS 1259514937) to ~3s after the event (GPS 1259514947). Note that the event happened at the end of this set of calibration injections which means that depending on the time window used the ~98 Hz and ~908 Hz lines can be constant in amplitude for one part of the window and then decrease in amplitude for the last part.

 

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