in the afternoon I worked again in the NI. I left at 19.30 LT

Between 11:00 and 13:00 utc, I tuned the offset of NCal temperature probes to have all of them at 22.5°C+-0.1°C when all rotors are off.

Then around 13:50, I switched all rotors ON to their default lines and closed the loops. 

Details:

Strictly speaking we shoud tune the parameters inside  /virgoData/VirgoOnline/SNEB_Fb.cfg and SWEB_Fb.cfg which set the parameters of the volts to temperature function.

But in good approximation, it is OK to modify the offset of the ADC to Volts conversion in /virgoData/VirgoOnline/SWEB_dbox_rack.cfg and /virgoData/VirgoOnline/SNEB_dbox_rack.cfg

For a 0.1V offset in these configurtation files we observe the following temperature changes in the sensor outputs:

The final offsets used in cfg files are then:

Since the re-opening of the IB-PR valve and the lock of the IMC, the temperature of the SIB1 bench started to increase. This is a known effect which is due to the warming of the optics by the main beam and, when the PR is parked in a "bad position" (see for exemple here and here), also to the back reflected beam from the PR, that stops on some optics/bench part instead of an apposite beam dump.

After few months of non-lock, the position of the PR could have drifted. With Paolo, we tried to bring back the PR close to its last good position and look at the SIB2_B2 photodiode to asses the aligned position (see fig. 1). We found out that the vertical position was quite off, but even after replacing the PR_Y DoF we could see any signal on B2.

However, looking at the MIR and MAR DoFs of the PR (see fig. 1), we see that for the same MAR_TX position, MIR_TX was off by ~ 150urad. This is probably due to the PR which slid on the wires during some of the test done in May. The back reflected beam was then touching the surface of the bench its, rising up its temperature.

Once found the aligned position, we left the PR with the usual misalignment and stored its new position on the PR Metatron node.

Starting from Saturday 11 july, the measured amplitudes of the 6 MHz and 56 MHz lines became noisy for an unknown reason. The 2 signals became noisy at the same time so we suspected a problem with the LNFS box that generates the two lines, while the 22MHz, generated on a different synthesizer (LNFS_2) doesn't show the same problem. 


In order to test this hypothesis, on July 15 at 9:00 UTC, the two LNFS boxes were exchanged, and the rms on the measured signal amplitude returned to normal. The rms of the 22MHz signal amplitude remained unchanged, and did not increase after the intervention.


At this point, we don't know exactly what causes the signals to become noisy.  A similar phenomenon has been already observed in the past, when the problem was associated to a temperature problem in the INJ IER. The temperature in IER rose by a few degrees and became more unstable since last month. This might be an explaination for the problem even if there is not a direct correlation observed at the moment.
 

The two LNFS boxes may be exchanged again in the future or swapped with one spare.
 

Since few week ago, after the intervention on INJ/ALS, the IMC longitudinal error signal shows a quite big offset (~ -1.8V), compared to the past( {-0.25, 0.1} ), visible as frequency to amplitude coupling on the INJ_PMC_TRA_DC_FMOD_COUPLING signal.

On Monday, we started to investigate the reason why this offset appeared.
We first checked whether the choise of the  22Mhz frequency modulation, used to lock IMC cavity, could itself be the cause of the offset. As we see in fig. 1, we started by putting at zero the IMC_OFFSET and scanning the 22Mhz on the LNFS up to few kHz of frequency shift. This resulted only in very small variations of the coupling channel.

Thus, we moved to investigate the way the beam enter the IMC cavity by acting on the BPC (with IMC_ON on 0, i.e. the BPC using its DCQPDs). As a result (fig. 2), the changes on the beam alignment improved the inejction into the RFC (visible on RFC_TRA signal), without changing the offset on the IMC longitudinal error signal.

Since July 8, 2026, the WEB external humidity and temperature sensors of the wheater station are producing wrong data.
First we did a restart of the VPM process BcMeteoWe (Detector s Environment Monitoring > Environment > BcMeteoWe) but it did not solve the issue. Then, today we went to WEB to check the console of the station, we looked at the cabling, disconnecting and reconnecting them, we also restarted the module. None of theese actions were usefull to restart the acquisition and no values of external temperature and humidity are read by the device, external pressure and wind parameters are correctly collected.

An inspection of the sensor placed on top of the building must be scheduled.
 

The swap to the emergency generator has been completed and a final test  with a sequence ~30 sec ENEL interruption -> generator intervention -> ENEL back -> generator offload has been satisfactorily performed.

Electrical situation is then back to default one.

A longer term solution for having the 2nd generator (GE 2) being able to serve both "UPS Central Building + UPS Computing Room + IPS  Central Building UTAs" and "IPS Central Building Chillers" is currently being planned (this solution is basically the first part of the generators parallelization that was already foreseen). 

ITF found DOWN and in UPGRADING Mode.
All times are UTC.
Below the list of activities comunicated to the Control Room:
07:41 - 10:03 Works in TCS Room (Ciardelli).
07:48 - 11:06 PAY IN installation in vacuum chamber (Majorana, Puppo, Pinto, and Benedetti, #69345).
07:54 - 08:40 NI PAY & tower electrical checks (Gherardini, Ricci, and Zaza in the tower, while Dattilo outside the tower, #69344, #69347, #69348). Tower electrical checks successfull.
The test of the backup generator has been performed twice in the afternoon (14:06, and 15:30), the IPS is now stable again and no other tests involving the shutting off of the IPS are needed. The setup of the Technical Building is back at the standard configuration using another generator #69351.
The activity in the CEB Clean Room is proceeding. 
 

Sub-system reports
SBE
SQB1: Recovered Vertical Position with Motor 3 rotating left, and Motor 4 rotating right.
DMS
TCS > Chillers: Shelved all DMS flags until the TCS AUX Lasers Cooling System will be installed.

Activity concluded at 11:06 UTC.

Zaza, Gherdardini, and Ricci will enterer the Clean Rooms and the base towers for NI Electrical Checks. Dattilo will stay outside Clean Rooms.

Majorana, Pinto will enter in the CEB Clean Rooms and in the NI tower since 08:00 LT.
Puppo and Benedetti will enter only in the CEB Clean Rooms since 8:30 LT.

We left the CEB clean rooms at 18.05 LT.

Last week the motor of one of the 500 KVA diesel generator (GE 1) hosted in the Technical Building and serving the Central Building + Computing room on UPS and Central Building UTAs on IPS was identified as faulty. 

Since it seems that motor repair could be lenghty the immediate solution being pursued at the moment is the renting of an emergency generator to be positioned in the vicinity of the TB that would replace the malfunctioning one and bringing back the standard situation.

This emergency generator has been already shipped onsite (See Fig. 1) and the electrical swap is currently foreseen for tomorrow, Tuesday June 14. The swap itself will not imply IPS interruptions but a test must be done on generator intervention so a ~30 sec ENEL interruption will be simulated.