Virgo Runs (O4b)menzione - 23:05 Thursday 02 May 2024 (64158)
Print this reportOperator Report - Night shift
DRAFT - REPORT IN PROGRESS - will be finalized at the end of the shift
ITF found in Science mode (LN3_SQZ)
Virgo Runs (O4b)Sposito - 23:00 Thursday 02 May 2024 (64157)
Print this reportOperator Report - Afternoon shift
ITF found in SCIENCE.
At 16:00 UTC, P. Ruggi and D. Bersanetti performed commissioning work on the CARM loop to reduce the oscillation at 1.8 Hz. Their work continued until 19:05 UTC. From 19:07 to 19:20 UTC, a scheduled calibration took place, CALIBRATED_DF_DAILY. At 19:20 UTC, the ITF was back in science mode.
Images attached to this report
Virgo Runs (O4b)berni - 15:01 Thursday 02 May 2024 (64155)
Print this reportOperator Report - Morning shift
ITF found in Science mode.
At 8:44 UTC the DMS started to report a red flag for WI_CO2_Laser - TCS_WI_CO2_PWROUT (see entry 64156).
I contacted the TCS on-call and from remote she adjusted the WI chiller set point, then at 9:17 UTC, we set Adjusting mode and she restored the standar power; ITF back in Science mode at 9:20 UTC.
ITF still in Science at the end of the shift.
ENV
Sea and windactivity increasing.
Software
At 12:50 UTC the VPM instance became frozen; it was restarted at 12:52 UTC.
Around 08.50 UTC Francesco called me from CR, because the DMS flag of WI_CO2_Laser became red for mean_TCS_WI_CO2_PWROUT value falling down.
First of all, I recovered the WI DAS outer ring power injected inside the interferometer, rotating the corresponding waveplate (action ended around 08.57 UTC)
Then, I try to recover WI CO2 main laser state by acting on its chiller setpoint:
at 09.00 UTC WI e BCK chiller setpoint changed from 19.03°C to 19.02°C → wrong direction
09.05 UTC WI e BCK chiller setpoint changed from 19.02°C to 19.04°C
Once the situation was re-established, I also recovered the waveplate (action ended at 09.20 UTC).
In Fig. 1 the main signals are reported.
Images attached to this report
Virgo Runs (O4b)menzione - 6:52 Thursday 02 May 2024 (64154)
Print this reportOperator Report - Night shift
I found ITF in SCIENCE MODE. It remained locked for the whole shift except for one unlock, at 21:22 UTC, done by mistake.
Virgo Runs (O4b)Sposito - 22:57 Wednesday 01 May 2024 (64153)
Print this reportOperator Report - Afternoon shift
I found ITF in SCIENCE. 15:32 UTC ITF in CALIBRATION to perform the scheduled activity.
15:33-16:33 UTC CALIBRATED_DF_SENSITIVITY.
16:34-17:09 UTC CALIBRATED_DF_PCAL
17:10-17:22 UTC CALIBRATED_DF_DAILY
17:30 UTC CALIBRATION ended, back to SCIENCE
Images attached to this report
Virgo Runs (O4b)berni - 15:02 Wednesday 01 May 2024 (64152)
Print this reportOperator Report - Morning shift
ITF found in relocking; it relocked at 5:35 UTC and it remained in Science mode for the rest of the shift.
Guard tours (time in UTC)
From 6:00 to 6:30; from 8:00 to 8:30; from 10:00 to 10:30; from 12:00 to 12:30.
Images attached to this report
Virgo Runs (O4b)ruggi - 11:47 Wednesday 01 May 2024 (64150)
Print this reportComment to Operator Report - Night shift (64147)
The earthwquake produced an increase of the seismic component at 1 Hz, which is a problem since the MAR/MIR actuation splitting filters have been changed: the unlock occurred when NE MIR CORR saturated (fig 1). Usually the reason of unlock during an earthquake is the saturation of MAR correction, due to the low frequency component of the surface seismic waves. A magnitude 4 in Croatia is not strong enough to produce a large slow oscillation of the suspension able to push the MAR corrections close to 10 V (fig 2). This kind of unlock would be likely avoided finding a way to restore the old MAR/MIR allocation strategy.
Images attached to this comment
Virgo Runs (O4b)berni - 9:21 Wednesday 01 May 2024 (64149)
Print this reportComment to Operator Report - Night shift (64147)
Virgo Runs (O4b)mwas - 7:55 Wednesday 01 May 2024 (64148)
Print this reportComment to Operator Report - Night shift (64147)
The unlock at 3:41 UTC could have been due to an earthquake. There was a seismic disturbance in both NEB and WEB at about that time.
Images attached to this comment
Virgo Runs (O4b)amagazzu - 6:52 Wednesday 01 May 2024 (64147)
Print this reportOperator Report - Night shift
ITF found in LOW_NOISE_3_SQZ and in Science Mode. The ITF unlocked at 3:41 UTC, and failed the relock twice at LOCKING_CARM_NULL_3F (3:57 UTC) and ACQUIRE_LOW_NOISE_1 (4:34 UTC). Relock in progress.
ruggi - 11:47 Wednesday 01 May 2024 (64150)
Print this report
The earthwquake produced an increase of the seismic component at 1 Hz, which is a problem since the MAR/MIR actuation splitting filters have been changed: the unlock occurred when NE MIR CORR saturated (fig 1). Usually the reason of unlock during an earthquake is the saturation of MAR correction, due to the low frequency component of the surface seismic waves. A magnitude 4 in Croatia is not strong enough to produce a large slow oscillation of the suspension able to push the MAR corrections close to 10 V (fig 2). This kind of unlock would be likely avoided finding a way to restore the old MAR/MIR allocation strategy.
We started at 14:00 UTC and to not interfere with the ITF and risk to unlock, we manually injected the SQZ.
System initial status: ITF LOW NOISE 3; SQZ_MAIN @SQZ_Locked_NO_FC
14:28:26 AA loop engaged
We performed a first CC phase scan (Fig. 1-2):
14:39 CC scan started DCP = 195 Hz
15:02:21 CC scan ended (fast shutter closed), ITF in shot
15:26:15 fast shutter opened
15:36:22 ITF in SQZ phi0 = 0.65 rad
15:39:19 SQB1 TX angle set to 300 (initially at 310)
16:42:58 SQB1 X position set to -3200 (original position)
16:47:58 ITF in SQZ
After the first CC scan we realized the magnitude was similar to the last shift (entry #64094) even though there should be a higher level of injected SQZ. We decided to try to improve the magnitude by acting on SQB1_TX and SQB1_X DOFs. We worked on this from 15:39:19 to 16:42:58 UTC. Finally we left SQB1_X as it was and we changed the set point of SQB1_TX from 310 to 330 urad. The fluctuations on the magnitude are reduced (Fig. 3).
We then performed another phase scan (Fig. 4-5)
17:05 CC scan started DCP = 195 Hz
17:28 CC scan ended (fast shutter closed), ITF in shot
After the second CC scan we realized the SQZ angle is actually around 1.05 rad, so we decided to repeat the SQZ mode acquisition.
17:39:53 fast shutter opened, ITF in SQZ phi0 = 1.05 rad
17:49:08 CC loop engaged, gain=75000 (glitch between 17:54:50 and 17:56:14)
17:58:54 ITF in ASQZ phi0 = 2.75 rad
We were able to get another CC phase scan with DCP setpoint at 225 Hz (Fig. 6-7). Fig. 8 reports also the shot SQZ and ASQZ acquisitions made after the scan.
18:11 DCP value set to 225 Hz
18:44:11 ITF in shot
18:46: CC scan started DCP = 225 Hz
19:09 CC scan ended
19:15:07 ITF in ASQZ phi0 = 2.7 rad
19:22:48 ITF in SQZ phi0 = 0.95 rad
19:28 DCP value set back to 195 Hz
Images attached to this report
Virgo Runs (O4b)Montanari - 23:04 Tuesday 30 April 2024 (64143)
Print this reportOperator Report - Afternoon shift
List of activities and actions performed during the shift:
At the beginning of the shift (13:09UTC), ITF unlocked due to the increase of the power on B1 photodiode and consequently the close of the fast shutter (first plot attached)
Relock at first attempt, and coming back to SCIENCE at 13:54UTC
From 14:04UTC to 14:UTC, ITF in CALIBRATION Mode to check hrec as planned (CALIBRATED_DF_DAILY)
After that, started planned SQZ activities, so I put ITF in COMMISSIONING Mode at 14:19UTC
14:48UTC VPM restarted
19:41UTC stopped COMMISSIONING and I put back ITF in SCIENCE
20:07UTC I disengaged the squeezing and exit from SCIENCE to allow H. Valbruch to solve system issues of this morning
20:20UTC SCIENCE Mode
Guard Tour (UTC) 17:08 - 17:37 19:06 - 19:32
Sub-system reports
Vacuum
16:15UTC lost of signals from 600W Tube Station
I notified A. Pasqualetti who agreed to carried out checks probably not before next maintenance.
In according with him I shelved related flags until Thursday
Images attached to this report
AdV-ISC (LSC Noise Budget)mwas - 20:12 Tuesday 30 April 2024 (64145)
Print this reportComment to LSC noise injections results (64132)
Figure 1. The CARM noise injection caused SR to move by ~0.5urad, because it made the B1 photodiodes saturate. It needs to be understood how the CARM noise injection shape needs to be changed so it doesn't cause B1 saturations which will spoil the measurement.
Figure 2. Normal daily hrec calibration measurements (between 16:00 UTC and 16:10 UTC) are no longer kicking the SR alignment.
Images attached to this comment
Infrastructures (Air Conditioning)soldani - 16:37 Tuesday 30 April 2024 (64144)
Print this reportHVAC tuesday maintenance_30.04.2024During Tuesday maintenance, this morning: - carried out weekly checks for boiler, AHU and chillers in TB, CEB and MC - refill of the LPG tank in Central area from 8.30 to 8.45 (UTC) - carried out periodic check for AHU fan-motor belts state of tension and consunption (with external firm) with a short shut down of the involved machines:
AHU Clean rooms CEB: off at 6.40 - on 7.25 (UTC) ---> status OK AHU INJ: off at 7.30 - on at 7.45 (UTC) ---> status OK AHU DET: off at 8.53 - on at 9.08 (UTC) ---> status OK
Virgo Runs (O4b)Sposito - 15:01 Tuesday 30 April 2024 (64135)
Print this reportOperator Report - Morning shift
ITF is found in SCIENCE.
At 6:01 UTC I set the ITF in Maintenance Mode, here is the list of the activities communicated to the Control Room:
Cleaning of Central Building, Laser Lab (external firm managed by Gargiulo);
VAC Refill (Vacuum Team);
6:30 UTC Refill TCS chillers and change the filter of the aux cooling system (N. Menzione and J. Gargiulo)
Operator Periodic Tasks (see section below);
check of magnetometers at CEB (I. Fiori, M, Graziaplena)
During the night the WI CO2 laser changed the state, but ITF remained locked: Magazzu sent an email and report about the DMS flag in the Virgo logbook (64134).
During this morning maintenance activities were foreseen, so I waited at least for the taking of thermal camera images and chiller refilling before making actions for WI CO2 laser power recovery. After the chiller refilling and filter change, the WI CO2 main laser state was mainly recovered (see Fig. 1).
A further activity was foreseen during maintenance in TCS room (repair WI etalon heating belt, 64114). I waited for the end of this activity to further check CO2 powers (Gianmatteo already checked them 64135) and eventually act on waveplates.
At 09.00 UTC, with ITF in down, I checked all CO2 powers restoring the nominal ones. This activity has been completed at 09.18 UTC.
We placed the magnetic probe onto the MC tube (similar location where it had been in the past). The acquired channel is perpendicular to the tube (probe "X"). We used the same name: ENV_CEB_MAG_MC_TUBE.
Vacuum (Detection)Vacuum - 11:40 Tuesday 30 April 2024 (64140)
Print this reportDT turbo pump cooling fan replacement
This morning during the maintenance break, we replaced a fan on the DT turbomolecular pump after noticing some unusual noise, possibly due to a worn bearing. We installed a standard domestic fan, mounted on rubber pads as usual (picture attached)
Images attached to this report
Detector Characterisation (Glitches)dattilo, cavalieri - 11:35 Tuesday 30 April 2024 (64139)
Print this reportComment to New numerous glitches starting last night (64114)As a follow up of the recent investigations on the WI etalon problem, we made a check of the WI heating belt power supply. At around 08:30 UTC we went in TCS room where the power supply is located, and also looking at its analog display, we saw that it was delivering intermittently, as indicated by the LSC_WI_HB_moni signal. We replaced the power supply with a spare one of the same kind (Kert 420). During the replacement (from 08:34 to 08:40 UTC) the operator temporarily opened the WI etalon loop, as recommended by Maddalena. Now the loop seems working regularly (attached fig).
Images attached to this comment
AdV-SVS (Pre-commissioning)sorrentino - 11:28 Tuesday 30 April 2024 (64137)
Print this reportImproving MZI and OPA alignment in SQZ board
This morning I slightly tweaked the alignment of the optics showed in entry 56246 inside the AEI sqzueezer board, in order to improve the MZI contrast and the pump beam alignment on the OPA.
I worked on MZI between 7:43 and 7:47 UTC, and on OPA between 7:52 and 8:19 UTC.
The MZI at the beginning was already quite high, and I could only improve it marginally - from 68% to 73%, see first attached plot.
After tweaking the pump beam alignment, the OPA peak trasmission improved by about 5% (see second attached plot) and the main HOM in OPA scan was reduced by a comparable amount (see third attached plot).
Images attached to this report
AdV-SBE (Minitowers)bulten, was, bertolini, bersanetti, gouaty, arnaud - 10:47 Tuesday 30 April 2024 (64138)
Print this reportDMS flags added to horizontal positions SBE benchesWhen the horizontal microsprings are adjusted, or maybe when other horizontal actions on the minitower benches are performed, the DMS system does not give a warning if the position is still far off the setpoint. This happened April 16, see logbook entry 64002 from Nicolas Arnaud. After discussions, we decided to add flags to the monitoring system; we had flags for the vertical position (-30that for the relative speeds for SNEB and SWEB with respect to the superattenuators, but this requires further study to see if there are cases that the relative speed between benches is high, but none of the flags (RMS actuator voltage, bench error signal) is already triggering.
IT infrastructure (Computing)kraja, cortese - 9:56 Tuesday 30 April 2024 (64136)
Print this reportFirmware upgrade on underlying virtual infrastructure During this maintenance window we will perform some necessary upgrades on the underlaying virtual infrastructure where the fileserver are hosted. This operation is totally transparent for the hosted systems on the infrastructure, and should not impact the fileservers at all.
Virgo Runs (O4b)amagazzu - 7:01 Tuesday 30 April 2024 (64134)
Print this reportOperator Report - Night shift
ITF found in LOW_NOISE_3_SQZ and in Science Mode. It kept the lock for the whole shift.