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.
Activity concluded at 11:06 UTC.
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.
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 activities comunicated to the Control Room:
07:32 - 10:49 NI payload assembly (Majorana, Pinto).
10:12 - 10:34 RFC Scan (Spinicelli from remote).
12:00 - 12:11 IMC Scan (De Rossi from remote).
12:26 - 12:55 Check of Newtonian Sensor at NEB (Tringali).
We continued to deploy the DAC1955 v3r3 firmware on all the DAC1955 boards use the SQZ system and driven by
Operations performed between 2026-07-08-11h36m47-UTC and 2026-07-08-15h54m33-UTC
Below the detailled list of the operations performed
This morning I measured the modulation index of the 6MHz and 56MHz after the work on INJ/ALS started on April.
I started scanning the RFC with the INJ in standalone at ~10.21.30UTC , by moving the MC on F0_Z axis for a 500µm displacement in 500µs , as usual.
The resulting modulation depth for the 6MHz and 56MHz are, respectively, ~0.19 and ~0.18, which correspond to the usual values.
We continued to deploy the DAC1955 v3r3 firmware on all the DAC1955 boards use the SQZ system and driven by
Operations performed between 2026-07-08-05h59m01-UTC and 2026-07-08-09h22m32-UTC
Below the detailled list of the operations performed
We continued to deploy the DAC1955 v3r3 firmware on all the DAC1955 boards use the SQZ system and driven by
Operations performed between 2026-07-08-05h14m16-UTC and 2026-07-08-05h44m40-UTC
Below the detailled list of the operations performed :
We left CEB clean room at 12:50 LT.
Erratum: The mirror used to align the master laser with the SL cavity is LB_M1, not LB_M2. Horizontally, the screw was turned anti-clockwise, and vertical screw was turned clockwise. The final linearity bandwidth after re-alignment is 1.9 MHz, not 1.0 MHz.
The method used to measure the linearity bandwidth of the slave laser is expalined in post 66249.
We are entering again the CEB clean room. 9.30 LT
We left CEB clean room at 12:50 LT.
We left the CEB clean room at 21.00 LT. Tomorrow morning we will continue.
Before measuring the locking bandwidth, the OLTF of the IMC was measured, and a 14° phase margin was measured.
We measure the locking bandwidth, which is the linearity zone between the SL cavlty length and the error signal. Initially, it was measured at 0.9 MHz
After turning the LB_M2 mirror horizonally, we managed to increase the bandwidth up to 1.3 MHz. After that, we measured the IMC OLTF again, and found a 19° phase marging.
After that, we tried to realign LB_M2 vertically, we managed to reach a 1.0 MHz bandwidth. The UGF of the IMC OLTF was 92kHz with a 23° phase margin. In order to increase the UGF, we diminished to IMC loop attenuator value from 11dB to 9dB, which increase the main gain of the loop. The new UGF is 120kHz with a 20° phase margin. The two plots shows the OLTF of the IMC with the attenuator at 11dB and at 9 dB.
Other subject: In order to stabilize the TY degree of freedom EIB, we moved the the water tubes of IPC1. It improves the TY value and releases a bit the actuator 0.
Erratum: The mirror used to align the master laser with the SL cavity is LB_M1, not LB_M2. Horizontally, the screw was turned anti-clockwise, and vertical screw was turned clockwise. The final linearity bandwidth after re-alignment is 1.9 MHz, not 1.0 MHz.
The method used to measure the linearity bandwidth of the slave laser is expalined in post 66249.