Reports of 63325
Vacuum (West input)
Vacuum - 18:28 Friday 05 June 2026 (69176) Print this report
WI tower venting
Venting process is ongoing.
Detector Operation (Operations Report)
gkaitatzis - 18:23 Friday 05 June 2026 (69175) Print this report
Comment to Operator Report - Daily shift (69169)

The problem of the PDU server was that the TANGO PDU server was also up and running and was interfering with the current server. Tango instance has been stopped, problem resolved.

Detector Operation (Operations Report)
menzione - 16:31 Friday 05 June 2026 (69169) Print this report
Operator Report - Daily shift

ITF DOWN in UPGRADING mode.

Palnned activities:

  • WI controls opened from remote by Boschi (13:15 UTC)
  • WI venting (started at 13:30UTC)
  • BPL Commissioning (in progress...)
  • TCS Chiller assembly & test (in progress...)
  • NI PAY assembly concluded (L. Naticchioni, E. Benedetti, H. Vocca, F. Travasso, A. Piluso, M. Montani, F. Piergiovanni)
  • 13:12 UTC - PduServer process restarted via VPM following the procedure descripted in the entry.
Images attached to this report
Comments to this report:
gkaitatzis - 18:23 Friday 05 June 2026 (69175) Print this report

The problem of the PDU server was that the TANGO PDU server was also up and running and was interfering with the current server. Tango instance has been stopped, problem resolved.

Environmental Monitoring (Environmental Monitoring)
fiori - 15:14 Friday 05 June 2026 (69174) Print this report
Comment to magnetic comb since April 20th (69040)

This morning at around 1AM UTC the external magnetometer detected a decrease (but not disappearence) of the comb noise intensity.

Images attached to this comment
Environmental Monitoring (Environmental Monitoring)
fiori, quemener, tringali, washimi - 15:08 Friday 05 June 2026 (69170) Print this report
Comment to magnetic comb since April 20th (69040)

We investigated further the 1Hz comb noise, which is still present.

Last Friday (May 29) we performed some measurements with one Bartington 3D Magnetometer and the portable spectrum analyzer CoCo80x.

First we found that the noise was present and quite intense close to the vacuum pipe of the W arm. Figure 1 shows the probe position in the first measurement: its tip was approximately 1 cm from the chamber at 900W and so approximately 0.6m from the tube center, the X axis was oriented along the tube, Y was vertical and Z was radial to the tube. In this position, the 1Hz comb field is oriented mainly along Y, being consistent with the field radiated by a current flowing along the tube. This is shown in Figure 2. The intensity is similar to what measured by similar sensors positioned close to vac chambers in CEB: that is a few nT/sqrt for the 1 Hz peak - compare with Figure 3 which uses the same 20s fft window.

The same Figure 2 shows recordings when the same probe was positioned by doubling the distance from the tube center: the field orientation is as well along Y and the intensity approximately halves. This looks consistent with a field being emitted by the beam tube. We then positioned the probe on the tunnel floor (which is the 3rd plot in Figure 2): the intensity is rougly the came but now the B field vector is oriented at 45 deg in the plane perpendicular to the tube, which also looks consistent with a field emitted by the tube.  Yet, when positioning the probe close to the tunnel roof a large signal is noticed (Figure 4). No measured amplification at the ethernet switch box and cables running along the tunnel wall.

We then repeated the measurement close to the tube at 1800W and 2700W: the emitted comb is there with similar intensity and orientation characteristics (Figure 5). This seems to contraddict the hypothesis that the noisy current is generated in CEB and decays flowing outwards along the tubes. While at 1800W we also sniffed the vacuum pump station as well as cables but found no amplification. At 2700W we also took again a measurement close to the tunnel roof, this time being outside. Interestingly the noise disappeared from the probe when positioning the probe in the middle of the nearby road (green track in Figure 5).

We finally took some measurements in the central external area: Figure 6. The comb is present! The signal is particularly intense close to the methan gas pipe tube nearby the guardiania. Il looks that one such pipe runs inside the EGO site along the South fence. We also moved in the external road and towards the location (approx. 100m before the EGO gate) where the SNAM company performed heavy works between February 5th untill the first week of April (Thank you Maria fro recording the dates). The noise level is more or less the same when moving the probe on a tripod at 1.5m above the ground (Figure 6).

Our suspect is that the source of the noise might be related to galvanic anticorrosion currents in the methan pipes, which in the past produced a non stationary 5Hz comb: https://logbook.virgo-gw.eu/virgo/?r=55542. This time instead the noise  is very stationary: the comb is extremely narrow and consistent with a GPS synch device.

A more stringent proof could come from measuring a few km away from EGO, in the locations explored in the past.

Images attached to this comment
AdV-DAQ (Data collection)
masserot, mours - 15:07 Friday 05 June 2026 (69173) Print this report
trend100s buffer use the 1TB disk

The FbTrend100s server configuration has been updated to use the  1TB disk available :

  • server restarted at  2026-06-05-12h56m07-UTC

 

AdV-PAY (NI and WI Payloads)
L. Naticchioni, E. Benedetti, H. Vocca, F. Travasso, A. Piluso, M. Montani, F. Piergiovanni - 12:44 Friday 05 June 2026 (69171) Print this report
NI mirror suspended, NI Payload partially assembled, CP structure assembled.
On June 4th, we completed the NI mirror monolithic suspension: the mirror is suspended with the HR face pointing down by 2 mrad. On the 5th, we assembled most of the payload structure (see attached pictures). We left the mirror suspended in the CB clean room. In parallel, the new CP suspension system is assembled and under test, with the CP held by the new blocking system (see the last attached picture).
Images attached to this report
AdV-SBE (EIB-SAS commissioning)
bulten, berni - 17:48 Thursday 04 June 2026 (69168) Print this report
SBE horizontal positioning
in the afternoon, after work on the bench, I tried to move the bench into the correct position with the microsprings. vertically the bench was pretty well aligned but horizontally not; ty was off by about 2.2 mrad. I could not zero Ty, z, and x simultaneously because I needed the microspring for horizontal 2 to go more backward. At software position 0, it will automatically move to the other side. The best I can do is either have Ty and x correct, but then z offset is around 0 instead of the required -165 micrometer, or get z correct but then Ty is 300 microrad off (negative). It took a long time to find a position in which the loop did close; typically it trips when going over 10 V or so so it tripped while the pid loop was still ramping, on actuator 2. I found a setting that the loop just barely closes.

We need to manually rebalance the EIB horizontally. I hope I can do that from remote, with local help, but I will discuss this later. It involves either manually rotating the microspring for horizontal 2 (if it is not at the end switch) or moving cables around so that the torque in Ty from the cables is changed.
Detector Operation (Operations Report)
berni - 17:04 Thursday 04 June 2026 (69158) Print this report
Operator Report - Daily shift

ITF DOWN in UPGRADING mode.

Activities communicated in control room:

 

SBE

SBE expert working from remote to restore and close the loop for EIB.

 

Software

BACnetServer found frozen: it was alive but  it was providing data. To restart it I had to manually kill it and then restart it from VPM.

AdV-EGO (Contamination Control)
menzione, zaza, ciardelli - 15:55 Thursday 04 June 2026 (69166) Print this report
NI - CO2 cleaning

This morning  (08:00 - 10:00 UTC) we performed the cleaning of NI tower with CO2 system.

Vacuum (North input)
Vacuum, Nardecchia - 15:25 Thursday 04 June 2026 (69164) Print this report
NI tower ZnSe viewport installation

this morning we replaced the two ZnSe disks recently found to be defective, elog_69077 . The spare disks had been inspected by Suzanne elog_69088. The two new viewports will have then to be He-tested for leaks when back under vacuum. Note: the larger ZnSe disk is the one numbered #03 , the smaller size disk is the number #3.

Images attached to this report
Injection system (General activities)
rcaval - 15:18 Thursday 04 June 2026 (69165) Print this report
Comment to INJ - ALS upgrades (68993)

A 18 kohm resistor has been inserted in series on each signal driving the piezo (X, Y), with the goal of insterting a low-pass filter (cut-off frequency = 3Hz) on the correction signal sent to the piezo limiting the bandwidth and filtering out the amplifier noise.

AdV-TCS (CO2 viewports)
melo, pasqualetti, erbanni, francescon, nardecchia - 13:51 Thursday 04 June 2026 (69162) Print this report
Comment to ZnSe viewport Inspections (69088)

Today we inspected the small NI viewport that was removed. During visual inspection of the ZnSe viewport after removal from the NI tower, a large number of reflective particulate-like features were observed on the optical surface exposed to the vacuum side while installed. The particles appeared as bright metallic/glitter-like flakes distributed across the central aperture and surrounding areas of the window. The distribution of the flakes was concentrated over a significant fraction of the clear aperture. Similar particulate debris was recovered from the surrounding handling surface. These observations are indicative of coating degradation and delamination from the ZnSe substrate (Figs. 1 and 2). Fig. 3 shows the air side of the viewport, which did not underwent the delamination process. The particles attached to this side seen on the photo are coming from the tissue that was contaminated from the vacuum side where the viewport was handled. 

The spare viewports that are going to be installed were also inspected by eye and both of them seems perfectly fine. Figs. 4 and 5 show both sides of the small viewport and Fig. 6 and 7 show both sides of the big viewport.

 

Images attached to this comment
Safety (General safety)
Clean_Operation - 12:53 Thursday 04 June 2026 (69163) Print this report
Comment to NI tower activity (69159)
Activity is concluded normally, we left the NI tpwer.
Safety (General safety)
Clean Operation - 12:52 Thursday 04 June 2026 (69159) Print this report
NI tower activity
Today at 10h we enter the NI tower in order to perform the CO2 cleaning process.
People involved: M.Ciardelli, N.Menzione, C.Zaza.
Comments to this report:
Clean_Operation - 12:53 Thursday 04 June 2026 (69163) Print this report
Activity is concluded normally, we left the NI tpwer.
Injection system (General activities)
lagabbe, melo, derossi, spinicelli, ruggi, pinto - 10:14 Thursday 04 June 2026 (69161) Print this report
Comment to Measurement of the sensing matrix of BPL (69150)

The "tranfer function" measured in the previous logbook entry is the tranfer function from a noise injected before the driving matrix and after the filter, to the normalized signal of the quadrants. So when we inject a noise on one of the TILT/SHIFT signal, this noise is only visible on the corresponding quadrant signal. In the example given in the  logbook entry, the noise is injected on TILT_X signal, and arrives on the far-field quadrant horizontally. The next image is a scheme of the BPL loop with the injected signal :
69161_1780560290_BPC_loop.png

Another remark: EIB was not suspeded when preforming all the measurements. So they have to be repeated with the EIB suspended, which may affect the measured sensing matrix, and so the corresponding driving matrix.

Images attached to this comment
AdV-PAY (NI and WI Payloads)
L. Naticchioni, E. Benedetti, H. Vocca, F. Travasso - 10:08 Thursday 04 June 2026 (69160) Print this report
NI payload ready for mirror suspension in CB clean room
Yesterday (3/6/26), the payload assembly structure was cleaned and leveled to allow for the mirror suspension scheduled today (4/6/26). Marionette nominal position and alignment recovered as usual.
Images attached to this report
Injection system (General activities)
lagabbe, melo, derossi, spinicelli, ruggi, pinto - 17:40 Wednesday 03 June 2026 (69157) Print this report
Comment to Measurement of the sensing matrix of BPL (69150)

The sensing and driving matrices measured in the precedent post 69150 were wrong, due to an error on the threshold on the phase that separates the positive from the negative responses between the piezo and the quadrants. The new matrices were computed:
sensing_matrix =
   -0.6230   -0.0278    0.0033    0.0012
    0.0233   -0.3838   -0.0010   -0.0059
   -0.5035   -0.0063   -0.4332   -0.0151
    0.0154    0.3421    0.0166   -0.2886

driving_matrix =
   -1.5909   -0.1001    1.8540   -0.0972
    0.1081   -2.5520    0.0166   -3.0190
   -0.0128    0.0071   -2.2893   -0.1237
   -0.0080    0.0517    0.1270   -3.3971
 
Using the new driving matrix, we managed to lock the BPL loop in drift control (f < 5 Hz). And then in broadband.
When the BPL is locked in broadband, a 122 Hz signal appeard on the QPD signal spectrums.
 69157_1780499525_BPL.png
 
In order to measure the open loop transfer function, the BPL loop was open and a colored noise signal with a 0.001 V amplitude was injected on the channels:

  • TILT_X_CORR 13:42:00 UTC
  • TILT_Y_CORR 13:45:30 UTC
  • SHIFT_X_CORR 13:48:40 UTC
  • SHIFT_Y_CORR 13:52:00 UTC

To see the transfer function at low frequency, a 0.03 V signal at frequency < 20 Hz was injected on the same channels at the times:

  • TILT_X_CORR 14:27:00 UTC
  • TILT_Y_CORR 14:30:00 UTC
  • SHIFT_X_CORR 14:32:30 UTC
  • SHIFT_Y_CORR 14:36:00 UTC

 The shape of the open loop transfer functions from the CORR signal to the corresponding of the quadrant signals are similar. The following plot is a  transfer function from TILT_X_CORR signal to QF_h_norm during a low frequency injection:
69157_1780501191_BPL_TILT_plant.jpg
 
The 122 Hz noise was due to a saturation of the control loop, so the loop filter was changed. The QPDs signal spectrums in closed loop, with the old and with the new filter are shown in the following plot:
 69157_1780500318_BPL_CL.png
The 122 Hz signal disapeared.

Images attached to this comment
Detector Operation (Operations Report)
zaza - 16:31 Wednesday 03 June 2026 (69154) Print this report
Operator Report - Daily shift

ITF DOWN in UPGRADING mode.
Operations carried out throughout the day:

  • FCIM test by HVAC: conditioning turned off for 24 hours
  • FCIM_SBE and FCEM_SBE position loops closed (likely opened by yesterday's earthquake in Calabria)
  • MC loops were also open and when closing them they showed high corrections. After a quick evaluation (Pinto, see #69153), given the fact that motor UI was not responding, I called Boschi. He noticed an issue with TANGO, problem fixed by Carbognani (server restarted)
  • MC IP centered (#69156, Boschi)
  • SAT PDU sockets signals have been showing alternating missing data since the computing shutdown on Apr 7th, SUS and DAQ problems have been ruled out (Boschi, Masserot). I notified service. Work in progress
  • DET vacuum chamber external inspection (VAC group)
  • BPL commissioning (INJ group, Pinto, Ruggi)
  • Infrastructure assessment in TCS chiller room to remove the door as part of AUX cooling system upgrade after past weeks' floor renovation (Fabozzi, Marano)
  • NI CP mount assembly (Naticchioni, Benedetti)
     
AdV-SAT (Suspension control upgrade)
Boschi - 12:15 Wednesday 03 June 2026 (69156) Print this report
Comment to MC controls and motors interface not working (69153)

Motor interfaces were not working since the relative TANGO servers were down. I recentererd the IP using the centering script. Now F0 positions should be fine.

AdV-SAT (Suspension control upgrade)
pinto - 10:40 Wednesday 03 June 2026 (69155) Print this report
Comment to MC controls and motors interface not working (69153)

When Cecilia tried to close the controls through the operator interface, the setpoints both of TOP stage and BOTTOM stage changed with respect to the used values, see fig.1. This issue has already been observed in 68701.

F0_X_SET: from -2000 to -450

MAR_TX_SET: from -104 to -20.5

MAR_TY_SET: from 163.5 to 144.

Maybe the setpoints have been changed without saving the values in DSP card and have been overwritten to older values.

Correct setpoints have still to be 'recovered'.

Images attached to this comment
AdV-SAT (Suspension control upgrade)
pinto, zaza - 10:05 Wednesday 03 June 2026 (69153) Print this report
MC controls and motors interface not working

On june 2nd at 14.52 UTC the control of MC suspensions opened. Now the top stage controls can't be closed again since the suspension is far away from the setpoints, it should be recovered maybe through the motors, but the motor UI is not working. Experts should address  the issue.

Comments to this report:
pinto - 10:40 Wednesday 03 June 2026 (69155) Print this report

When Cecilia tried to close the controls through the operator interface, the setpoints both of TOP stage and BOTTOM stage changed with respect to the used values, see fig.1. This issue has already been observed in 68701.

F0_X_SET: from -2000 to -450

MAR_TX_SET: from -104 to -20.5

MAR_TY_SET: from 163.5 to 144.

Maybe the setpoints have been changed without saving the values in DSP card and have been overwritten to older values.

Correct setpoints have still to be 'recovered'.

Images attached to this comment
Boschi - 12:15 Wednesday 03 June 2026 (69156) Print this report

Motor interfaces were not working since the relative TANGO servers were down. I recentererd the IP using the centering script. Now F0 positions should be fine.

Vacuum (General_status)
Vacuum - 18:53 Tuesday 02 June 2026 (69151) Print this report
Activities of 01Jun and 02Jun
Today morning maintenance activity: liquid nitrogen tanks refilled.

Yesterday 1st Jun we performed a leak test session on the IB tower, to investigate about the presence of a small leak.The following areas were checked: upper viroles, inlet beam rectangular viewports (assisted by Spinicelli), minilinks to SIB2, IB cryovalve actuator.
- no leak was detected (the He LD background signal was 1.5E-9 mbar·l/s)
- to be continued: feedthroughs, pump, pump backing line.
Injection system (General activities)
lagabbe, spinicelli, ruggi - 18:37 Monday 01 June 2026 (69150) Print this report
Measurement of the sensing matrix of BPL

To measure the sensing and driving matrix of BPL, a sinusoidal signal at 2 Hz, with 0.2 V amplitude was injected on channels:

  • PZT_EIB_M1BH_CORR
  • PZT_EIB_M1BV_CORR
  • PZT_LB_M14H_CORR
  • PZT_LB_M14V_CORR

Directly on the piezo correction signal. The BPL loop was open while injecting noise.

The signals were injected respectively at GPS times [1464363022, 1464363121, 1464363296, 1464363397] , each injection lasted for 60 s.

The channels QF_h_norm, QF_v_norm, QN_h_norm and QN_v_norm were monitored to see the effect of each piezo on each quadrant.

Piernicola's matlab script "Sensing_matrix_BPL.m" was used to compute the matrices:


sensing_matrix =

   -0.6230   -0.0278    0.0033    0.0012
    0.0233   -0.3838    0.0010   -0.0059
   -0.5035    0.0063    0.4332    0.0151
    0.0154    0.3421    0.0166    0.2886


driving_matrix =

   -1.6099   -0.1078   -1.8808    0.3216
    0.1242   -2.6459    0.0738    3.1261
    0.0118    0.0090    2.3271   -0.1449
    0.0085   -0.0545   -0.1126    3.5359

However, the loop does not close. We tried to adjust the setpoint of the piezo (TILT/SHIFT_X/Y_CORR_SET) so as the norm signal of the QPDs come close to 0, and tried several values of the DRIFT_FILTER gain but we did not succeed.

Paolo got a similar driving matrix, the values of the set point has to be studied more deeply.

 

Comments to this report:
lagabbe, melo, derossi, spinicelli, ruggi, pinto - 17:40 Wednesday 03 June 2026 (69157) Print this report

The sensing and driving matrices measured in the precedent post 69150 were wrong, due to an error on the threshold on the phase that separates the positive from the negative responses between the piezo and the quadrants. The new matrices were computed:
sensing_matrix =
   -0.6230   -0.0278    0.0033    0.0012
    0.0233   -0.3838   -0.0010   -0.0059
   -0.5035   -0.0063   -0.4332   -0.0151
    0.0154    0.3421    0.0166   -0.2886

driving_matrix =
   -1.5909   -0.1001    1.8540   -0.0972
    0.1081   -2.5520    0.0166   -3.0190
   -0.0128    0.0071   -2.2893   -0.1237
   -0.0080    0.0517    0.1270   -3.3971
 
Using the new driving matrix, we managed to lock the BPL loop in drift control (f < 5 Hz). And then in broadband.
When the BPL is locked in broadband, a 122 Hz signal appeard on the QPD signal spectrums.
 69157_1780499525_BPL.png
 
In order to measure the open loop transfer function, the BPL loop was open and a colored noise signal with a 0.001 V amplitude was injected on the channels:

  • TILT_X_CORR 13:42:00 UTC
  • TILT_Y_CORR 13:45:30 UTC
  • SHIFT_X_CORR 13:48:40 UTC
  • SHIFT_Y_CORR 13:52:00 UTC

To see the transfer function at low frequency, a 0.03 V signal at frequency < 20 Hz was injected on the same channels at the times:

  • TILT_X_CORR 14:27:00 UTC
  • TILT_Y_CORR 14:30:00 UTC
  • SHIFT_X_CORR 14:32:30 UTC
  • SHIFT_Y_CORR 14:36:00 UTC

 The shape of the open loop transfer functions from the CORR signal to the corresponding of the quadrant signals are similar. The following plot is a  transfer function from TILT_X_CORR signal to QF_h_norm during a low frequency injection:
69157_1780501191_BPL_TILT_plant.jpg
 
The 122 Hz noise was due to a saturation of the control loop, so the loop filter was changed. The QPDs signal spectrums in closed loop, with the old and with the new filter are shown in the following plot:
 69157_1780500318_BPL_CL.png
The 122 Hz signal disapeared.

Images attached to this comment
lagabbe, melo, derossi, spinicelli, ruggi, pinto - 10:14 Thursday 04 June 2026 (69161) Print this report

The "tranfer function" measured in the previous logbook entry is the tranfer function from a noise injected before the driving matrix and after the filter, to the normalized signal of the quadrants. So when we inject a noise on one of the TILT/SHIFT signal, this noise is only visible on the corresponding quadrant signal. In the example given in the  logbook entry, the noise is injected on TILT_X signal, and arrives on the far-field quadrant horizontally. The next image is a scheme of the BPL loop with the injected signal :
69161_1780560290_BPC_loop.png

Another remark: EIB was not suspeded when preforming all the measurements. So they have to be repeated with the EIB suspended, which may affect the measured sensing matrix, and so the corresponding driving matrix.

Images attached to this comment
Detector Operation (Operations Report)
gherardini - 16:45 Monday 01 June 2026 (69149) Print this report
Operator Report - Daily shift
Activities communicated to the control room:

- SIB1 tower vacuum leak test, from 13:15UTC to 14:30UTC;
- BPL loop commissioning, in progress;
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