ITF found in LOW_NOISE_3_SQZ and in Science Mode.
At 18:30 UTC I set the ITF in CALIBRATION mode to perform the planned tasks for the afternoon:
- From 18:30 UTC, check hrec (CALIBRATED_DF_DAILY from CALI Metatron Node), concluded at 18:42 UTC;
- From 18:46 UTC, inject_lsc.py, concluded at 18:59 UTC;
ITF back in Science Mode from 19:03 UTC.
Guard Tour (UTC):
13:12 - 13:39
15:00 - 15:29
17:45 - 18:16
19:30 - 20:00
ITF Found in LOW_NOISE_3 and Science Mode.
At 16:00 UTC I set the ITF in Commissioning mode to allow the planned SQZ investigation, carried out by Zendri, Sorrentino, and De Laurentis. At 16:17 UTC, under the request of the crew, I set the ITF back in LOW_NOISE_3_SQZ to study the behavior. No sudden drops in Hrec_Range_BNS occurred during this period, so it was agreed to keel the ITF back in LOW_NOISE_3_SQZ for the time being. SQZ investigation concluded at 17:00 UTC.
At 17:07 UTC, in agreement with Tringali, I launched the planned ENV Injections with the ITF in LOW_NOISE_3_SQZ. ENV Injections concluded at 17:50 UTC, ITF back in Science Mode from 17:54 UTC. It remained in this configuration for the rest of the shift.
Guard Tour (UTC)
17:21 -
ITF found in LOW_NOISE_3_SQZ and in Science Mode.
From around 5:02 UTC the Hrec_Range_BNS started to heavily fluctuate (see attached plot #1). During the rest of the shift the Hrec_Range_BNS dropped multiple times, thanks to the investigation of Di Renzo it was found a correlation with the Squeezing (see report #64271). At 8:23 UTC I contacted the SQZ expert (De Laurentis), which started the investigation.
From 5:57 UTC to 5:59 UTC I set the ITF in Adjusting mode to allow Nardecchia to perform the planned EM RH step (see report #64269).
At 8:39 UTC, due to a new series of glitches, I put the ITF back in LOW_NOISE_3 (SQZ disengaged), ITF back in Science Mode at 8:41 UTC.
From 9:14 UTC to 9:29 UTC, under request of Sorrentino, I set the ITF back in Adjusting mode to allow further investigation on the SQZ issues, but no clear issues were identified.
From 8:55 UTC to around 12:40 UTC Hrec_Range_BNS remained stable, but from 12:40 UTC another burst of glitches occurred (see attached plot #2). SQZ investigation in progress.
ITF left in LOW_NOISE_3 and in Science Mode.
As planned, this morning at 05.59 UTC, the ETM RH powers have been changed with the iTF in 'adjusting'.
This step will be referred to as STEP 2.
All RH power values are summarized in the table below:
| RH powers Starting point/ STEP 1 / STEP 2 | NE | WE |
| +100 mW on the NE wrt STEP 1 -100 mW on the WE wrt STEP 1 | 6.9→ 7.0 W → 7.1 W [16.04 → 16.14 V → 16.25 V] | 8.4→ 8.3 W→ 8.2 W [ 17.67→ 17.57 V → 17.47 V] |
ITF found in LOW_NOISE_3_SQZ and in Science Mode. It kept the lock for the whole shift.
No DMS alarms were received during the shift.
Upon reaching the site, I've found the ITF in LOW_NOISE_3_SQZ and Science Mode.
At 14:00 UTC I set the ITF in Commissioning Mode to allow the planned activity for the afternoon (Characterization for EM RH tuning) carried out by Nardecchia, de Rossi, Melo, Gouaty (see report #64205).
At 14:17 UTC the ITF was unlocked by De Rossi and Melo by performing a kick on the end mirrors, followed by a brief period at LOCKED_ARMS_BEATING (from 14:28 UTC to 14:51 UTC).
At 16:06 UTC we reached CARM_NULL_1F, and we waited one hour before performing the OMC Scan (scan done from 16:08 UTC to 16:31 UTC, see report #64206).
After that we reached LOW_NOISE_2 at 16:50 UTC, we waited 90 minutes to take reference data.
ITF back in LOW_NOISE_3_SQZ and Science Mode from 18:31 UTC.
Guard Tour (UTC):
17:06 - 17:36
19:01 - 19:28
The goal of the shift was to characterize the ITF working point with the following RH powers:
| RH powers | NE | WE |
| Current settings | 6.9 W [V=16.04 V] | 8.4 W [V=17.67 V] |
The actions performed during the shift are listed below:
13.08 UTC: ITF relocked in LN3
14.18 UTC: ITF manually unlocked to perform input beam mode matching measurement with the free swinging technique and green laser scan (performed by Suzanne, Camilla and Matthieu).
See detailes in 64204
15.03 UTC: ITF relocked in CARM NULL 1F
16.08 UTC: OMC scan started (performed by Romain and Andrea)
16.30 UTC: OMC scan ended
16.52 UTC: ITF relocked in LN2
After 1.5 hr in LN2, at 18.20 UTC, Andrea will proceed with the lock acquisition.
The main ITF signals during this afternoon are shown in figure 1.
Figure 1 shows the scan of the OMC performed from 16h08 utc to 16h30 utc, after waiting for 1 hour in CARM_NULL_1F.
Figure 2 shows a zoom of this scan around a Free Spectral Range.
Assuming a calibration factor of about 4800 for B1_PD3, we have: ~75 mW on the first order mode, ~29 mW on the second order mode, ~200 mW on each of the third and fourth order modes, ~70 mW on each of the 5th and 6th order modes, ...
Figure 1 tries to fit the scan calibrated into MHz, the scan is not well linear so it doesn't work perfectly well. The order 2 mode is crossed at least 4 times during the scan, these are the 4 peaks highlighted, two during the time the temperature is increasing and two during the time the temperature is decreasing. The order 2 mode varies between 19mW and 41mW using the same calibration factor for B1 PD3 of 4800.
/users/mwas/OMC/OMC_scan_demod_20240507/OMC_SCAN.m
ITF found in LOW_NOISE_3_SQZ and in Science Mode. It kept the lock for the whole shift.
Sub-system reportsDAQ
From around 10:39 UTC the process ELE_QGBT was reported as not responding on VPM (Orange State) and as not working on DMS (red flag). At 10:46 UTC I restarted the process via VPM to restore the nominal condition.
The process ELE_QGBT interrogates different electrical nodes; when a node does not respond the process automatically goes into the Error state. Obviously, data related to that node is not sent to the DAQ. When the problem disappears, the process automatically goes in the Golden state (so it not necessary to restart the process from VPM) and the slow monitor date is sent again to DAQ.
Today at 10h24 LT I put in operation a new version (v6r9) of this server to try to detect nodes generating problems. In this new version when a node does not respond, the ELE_QGBT goes in Active State and not in Error State.
ITF found in LOW_NOISE_3_SQZ and in Science Mode. It kept the lock for the whole shift.
Guard Tours (UTC):
5:01 - 5:28
7:01 - 7:30
9:11 - 9:38
11:01 - 11:30
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.
No DMS alerts received during the shift.
Guard Tour (UTC):
21:06 - 21:33
23:00 - 23:30
21:34 - 22:03
03:45 - 04:17
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.
The earthquake is the following: M 4.4 - 4 km W of Rakovica, Croatia.
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.
ITF found in LOW_NOISE_3_SQZ and in Science Mode. It kept the lock for the whole shift.
Guard Tour (UTC):
21:01 - 21:29
23:02 - 23:29
01:01 - 01:29
03:01 - 03:29
TCS
At around 4:25 UTC the value of TCS_WI_CO2_PWROUT suddenly decreased (see attached plot). Expert informed via mail of the issue.
ITF found in LOW_NOISE_3_SQZ and in Science Mode.
At 18:30 UTC I set the ITF in CALIBRATION Mode to perform the planned measurements:
ITF back in Science mode from 19:16 UTC.
Guard Tour (UTC):
14:05 - 14:55
15:57 - 16:32
19:06 - 19:36
DAQ
The process FCIM_MotSwitch stopped working at around 17:41 UTC. Process restarted via VPM at 17:44 UTC.
ITF found in LOW_NOISE_3_SQZ and in Science Mode.
From 13:07 UTC to 13:08 UTC I set the ITF in ADJUSTING Mode to allow Nardecchia to turn the WI waveplate (see report #64116).
At around 17:50 UTC I was contacted by the LIGO Livingston Control Room, which reported that both LIGO ITF would postpone the planned calibrations by 24 hours. In agreement with the Commissioning coordinator, the planned Hrec calibration and LSC injections are postponed until tomorrow afternoon.
ITF left locked.
Guard Tour (UTC)
13:01 - 13:29
15:01 - 15:29
17:50 - 18:20
19:41 - 20:20
Nicola called me because the WI CO2 laser changed its state (see figure 1).
To address the change in the WI outer power, I first rotated the WI outer ring waveplate to recover the nominal power to be injected into the ITF (11.59 UTC-12.00.26 UTC ) (ITF in ‘adjusting’ mode). Then, I adjusted the WI chiller set point to return the laser to its usual operating point, in particular I decreased it by 0.01 degrees, from 19.02 to 19.01 (12.21.04 UTC). The BCK chiller set point has been changed accordingly. This action did not solve the problem; in fact, the direction turned out to be wrong.
Thus, at 12.41 UTC, I increased the chiller set point from 19.01 to 19.03 degrees.
Finally, the standard situation has been restored (see fig.2).
ITF found in LOW_NOISE_3_SQZ and in Science Mode, it kept the lock for the whole shift.
Shift in Progress
ITF found in LOW_NOISE_3_SQZ and in Science Mode, it kept the lock for the whole shift.
Guard tour (UTC):
7:02 - 7:29
9:01 - 9:27
11:01 - 11:28
DAQ
During the shift the VPM stopped working three times (9:19 UTC, 9:57 UTC, 10:52 UTC). In all cases, it was possible to restart the VPM following the procedure provided by Pacaud.
Upon reaching the site, I found the ITF locked in LOW_NOISE_3_SQZ and in Science Mode. At 22:12 UTC the Squeezing disengaged, bringing the ITF back in LOW_NOISE_3. ITF back in LOW_NOISE_3_SQZ from 22:14 UTC.
ITF left locked.
Guard Tour (UTC):
21:30 - 22:00
23:30 - 00:00
1:38 - 2:07
3:07 - 3:18
DAQ
The process ELE_QGBT was not working correctly, it was reported as not working on DMS and in Orange state on VPM. At 4:13 UTC I restarted the process to solve the issue.
Upon reaching the site, I found the ITF locked in LOW_NOISE_3 and in Science Mode. It kept the lock for the whole shift.
Guard Tour (UTC):
21:06 - 21:36
22:55 - 23:25
1:33 - 2:02
3:50 - 4:20
DAQ
The process ELE_QGBT was not working correctly, it was reported as not working on DMS and in Orange state on VPM. At 1:05 UTC I restarted the process to solve the issue.
Upon reaching the site I found the ITF relocking. After a brief alignment of the PR/SR Mirrors, LOW_NOISE_3_SQZ was reached at the first attempt at 13:50 UTC, ITF back in Science Mode from 15:32 UTC.
At 15:07 UTC I set the ITF in Commissioning Mode to allow the planned ISC activity, DIFFp set point error signal test, carried out by Mantovani. The work could not be concluded due to an unlock at 15:22 UTC due to an earthquake (M 5.6 - 9 km W of Sulusaray, Turkey, 15:11 UTC). After various attempts we were able to reach LOW_NOISE_3_SQZ at 16:53 UTC, and the second planned activity, ENV Acustic Injection, started (see report #64024).
ENV Activity concluded at 18:11 UTC and ITF back in Science Mode. A quick adjusting period, from 18:16 UTC to 18:17 UTC, was done to allow the switch off the Speaker PDU.
The ITF unlocked at 19:34 UTC, relock in progress.
Guard tour (UTC):
17:06 - 17:44
19:03 - 19:30
Upon reaching the site, I found the ITF in LOW_NOISE_3_SQZ and in Science Mode. The ITF unlocked at 15:03 UTC due to an earthquake (M 6.3 - 17 km WSW of Uwajima, Japan, 14:14 UTC), preventing the lock of the infrared cavities.
From 15:40 UTC the influence of the shaking decreased enough and it was possible to relock.
ITF back in LOW_NOISE_3_SQZ at 16:16 UTC and the planned ISC/INJ activity (see report #64007) started; work concluded at 19:13 UTC.
The ITF unlocked at 19:24 UTC, followed by various unlocks at different steps of the locking acquisition (ACQUIRE_LOW_NOISE_2, LOCKING_CARM_NULL_1F).
Relock in progress.
No DMS alerts received were received during the shift.
Guard tour (UTC)
17:01 - 17:42
19:01 - 19:28
Yesterday at 19:24 UTC the ITF unlocked because of a saturation of WE MIR actuation (fig 1). The correction was progressively increasing in the latest half an hour and it was often very close to 10 V in the latest minutes (fig 2). It was due to an increasing of ground motion between 0.5 and 1 Hz (fig 3), typically due to the weather close to the site (for instance, strong rain or particularly stormy sea). That frequency component was the main responsible of the large correction (fig 4); improving the filters at that frequency has for sure an impact at 1.8 Hz, so any change needs to be tested in terms of stability. There is also the chance that something can be improved at the level of the top stage control, but also in that case, the margin of improvement without worsening other frequency regions is small.
This morning we noticed that the WI main CO2 laser continued to be in an unstable state since last night at around 06.30 UTC, so we decided to act on WI CO2 chiller setpoint, changing it from 19.04 °C to 19.02°C (12.37 UTC, Fig. 1) in order to restore the correct power values. Also the BCK chiller set point has been changed at the same setpoint.
After this change, there have been no significant changes in the powers of the actuators, which have remained stable around their nominal values. The situation will continue to be monitored to determine whether further intervention will be necessary.
Upon reaching the site, I found the ITF relocking, but it kept unlocking during various steps of the locking acqusitition.
At 6:07 UTC I set the ITF in Maintenance Mode, here the list of the activities communicated to the Control Room:
Periodic Tasks carried out by the Operator:
| CH (W) | Inner DAS (W) | Outer DAS (W) | |
| W Pickoff | 0.295 | 0 | 0.206 |
| N Pickoff | 0.596 | 0.052 | 0.598 |
To allow the external firm to clean around EIB, the bench was blocked by De Rossi from 8:48 UTC to 9:29 UTC. Due to the ongoing activities (missing laser and PR ID loop open) it was not possible to perform the planned ALS Maintenance.
After the activity on the PR was concluded we started to relock, but the ITF kept unlocking at various steps of the locking acqusition, possibly due to the worsening of the weather.
Relock in progress.
The ITF was locked for the whole shift in LOW_NOISE_3_SQZ and in Science Mode.
Guard Tour (UTC):
21:02 - 21:31
23:10 - 23:40
00:56 - 1:27
3:15 - 3:45
The first part of the shift was dedicated to the SAT Investigation on PR glitches, carried out by Boschi, Ruggi and Dattilo. At 14:20 UTC the crew left the Central building and, after Boschi recovered the Vertical correction of the PR (from 14:50 UTC to 15:05 UTC) we started to relock.
ITF back in LOW_NOISE_3_SQZ at 16:01 UTC, Boldrini performed the planned DIFFp_TX line adjustment (see report #63885), which was concluded at 16:23 UTC.
The planned DET activity, SDB1 Y scan, carried out by Gouaty from remote, started soon after. The ITF unlocked at 17:24 UTC due to a PR Trip (see attached plot), after relocking at 18:16 UTC the work proceeded until 20:01 UTC.
At 20:02 UTC I started the daily calibration (CALIBRATED_DF_DAILY), but unlocked at 20:16 UTC at the 10th injection.
Relock in progress.
Guard Tour (UTC)
17:45 - 18:20
19:40 - 20:13
