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.

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

• rtpc3 :  the 11 DAC1955 boards have been updated
  • Tolm output data flow is reduced from 37.7MB/s to  12.MB/s

Operations performed between  2026-07-08-11h36m47-UTC and   2026-07-08-15h54m33-UTC

• all the loops were opened during the time of the operations
• we checked that all the DAC1955 Tolm packets are well received by the expected DAC1955  board
• the SQB1 LC loops were successfully closed after the update . The SBE ones were not closed before the upgrade
• The FCEM LC and SBE loops were successfully closed after the update
• The FCIM LC and SBE loops were successfully closed after the update

Below the detailled list of the operations performed

• Use DaqBox v17r11 for SQB2_dbox_bench, SQB2_dbox_rack, FCEM_dbox and FCIM_dbox
• SQB2_LC server : 3 DAC1955 boards
  • SQB2_DAC_PSD                 : DAC1955_SN161 - DBOX_SN108 - SQB2_dbox_bench     : rtpc3
  • SQB2_DAC_LC_LVDT_in    : DAC1955_SN049 - DBOX_SN107 - SQB2_dbox_bench     : rtpc3
  • SQB2_DAC_LC_LVDT_out  : DAC1955_SN150 - DBOX_SN096 - SQB2_dbox_rack        : rtpc3
  • We checked  that the Tolm packects are correctly received by the DAC boards
  • the SQB2_LC loops were successfully closed after the upgrade
• SQB2_SBE and EQB2_QD servers : 2 DAC1955 boards
  •  SQB2_DAC_SBE0             : DAC1955_SN152 -  DBOX_SN095 - SQB2_dbox_rack        : rtpc3
    • SQB2_SBE server    : ch00-ch03 : 4 channels
    • EQB2_QD server      : ch04-ch05 : 2 channels
  • EQB2_DAC_IR_GALVO      : DAC1955_SN122 - DBOX_SN110 - SQB2_dbox_rack        : rtpc3 : all the channels are managed by the EQB2_QD server 
  • We checked  that the Tolm packects are correctly received by the DAC boards
  • It remains to check that the galvo loops are still running correctly
• FCEM_LC and FCEM_SBE servers: 2 DAC1955 boards
  • FCEM_DAC_LC0                 : DAC1955_SN013 - DBOX_SN068 - FCEM_dbox             : rtpc3  : all the channels are managed by the FCEM_LC server 
  • FCEM_DAC_SBE0              : DAC1955_SN127 - DBOX_SN069 - FCEM_dbox             : rtpc3  : shared DAC board
    • FCEM_SBE server : ch00-ch03 : 4 channels
    • FCEM_LC server  : ch04-ch07 : 4 channels
  • We checked  that the Tolm packects are correctly received by the DAC boards
  • The FCEM LC and SBE loops were successfully colsed after the upgrade
• FCIM_LC and FCIM_SBE servers : 2 DAC1955 boards
  • FCIM_DAC_LC0                   : DAC1955_SN143 - DBOX_SN024 - FCIM_dbox              : rtpc3 : all the channels are managed by the FCIM_LC server 
  • FCIM_DAC_SBE0                : DAC1955_SN125 - DBOX_SN073 - FCIM_dbox              : rtpc3  : shared DAC board
    • FCIM_SBE server : ch00-ch03 : 4 channels
    • FCIM_LC server  : ch04-ch07 : 4 channels
  • We checked  that the Tolm packects are correctly received by the DAC boards
  • The FCIM LC and SBE loops were successfully colsed after the upgrade
• Unused DAC1955 boards : 2 boards
  • FCEB_DAC_00                     : DAC1955_SN014 - DBOX_SN045 - FCEM_dbox             : rtpc3 
  • FCIB_DAC_00                      : DAC1955_SN033 - DBOX_SN112 - FCIM_dbox               : rtpc3 

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

• the rtpc2 : the 9 DAC1955 boards are updated
  • Tolm output data flow is reduced from 37.7MB/s to  8.4MB/s

Operations performed between 2026-07-08-05h59m01-UTC  and  2026-07-08-09h22m32-UTC

• all the loops were opened during the time of the operations
• we checked that all the DAC1955 Tolm packets are well received by the expected DAC1955  board
• the SQB2 LC and SBE loops were successfully closed after the update

Below the detailled list of the operations performed

• Use DaqBox v17r11 for SQB1_dbox_bench, SQB1_dbox_rack and  EQB_QD_dbox_rack
• SQB1_LC  and SBE servers :  4 DAC1955 boards
  • SQB1_DAC_PSD                : DAC1955_SN120 - DBOX_SN103 -  SQB1_dbox_bench      : rtpc2 
  • SQB1_DAC_LC_LVDT_in   : DAC1955_SN135 - DBOX_SN103 -  SQB1_dbox_bench      : rtpc2 
  • SQB1_DAC_LC_LVDT_out : DAC1955_SN144 - DBOX_SN088 -  SQB1_dbox_rack         : rtpc2
  • SQB1_DAC_SBE0              : DAC1955_SN147 - DBOX_SN087 -  SQB1_dbox_rack         : rtpc2
  •  We checked  that the Tolm packects are correctly received by the DAC boards
  • The  SQB1 LC and the SBE  loops were successfully closed after the upgrade
• SQB1_FI server : 1 DAC1955 board
  • SQB1_DAC_01                   : DAC1955_SN151 - DBOX_SN088 -  SQB1_dbox_rack         : rtpc2
  • We checked  that the Tolm packect is correctly received by the DAC board
• EQB1_QD server : 1 DAC1955 board
  • EQB1_DAC_03                   : DAC1955_SN148 - DBOX_SN091 -  SQB1_dbox_rack        : rtpc2
  • We checked  that the Tolm packects are correctly received by the DAC boards
  • It remains to check that the galvo loops are still running correctly
• EQB1_HD_AA server : 2 DAC1955 boards 
  • EQB1_DAC_01                 : DAC1955_SN149 - DBOX_SN089 -  SQB1_dbox_rack          : rtpc2
  • EQB1_DAC_02                 : DAC1955_SN146 - DBOX_SN091 -  SQB1_dbox_rack          : rtpc2
  • We checked  that the Tolm packects are correctly received by the DAC boards
• EDB_QD_AA and EDB_QD_MM servers : 1  DAC1955 board
  • EDB_DAC3                       : DAC1955_SN119 - DBOX_SN075 -  EDB_dbox_rack            : rtpc2
    • EDB_QD_AA server         : EDB_DAC3             : ch00-ch03 : 4 channels
    • EDB_QD_MM server        : EDB_DAC3             : ch04-ch07 : 4 channels
  • We checked  that the Tolm packect is correctly received by the DAC board
  • It remains to check that the galvo loops are still running correctly

We continued to deploy the DAC1955 v3r3 firmware on all the DAC1955 boards use the SQZ system and driven by

•  the rtpc23 : 1 DAC1955 board  updated
  • Tolm output data flow is reduced from 4.2MB/s to  0.42MB/s  
• the rtpc1: 2 DAC1955  boards updated 
  • The total  Tolm output data flow reduced from 54.5MB/s  to 11MB/s

Operations performed between 2026-07-08-05h14m16-UTC and 2026-07-08-05h44m40-UTC

• all the loops were opened during the time of the operations
• we checked that all the DAC1955 Tolm packets are well received by the expected DAC1955  board

Below the detailled list of the operations performed :

• Use DaqBox  v17r11 for  SQZ_DBOX_DET_EERoom  server 
• SQZ_PLL_AA server :  1 DAC1955 board
  • SQZ_DAC2             : DAC1955_SN032 - DBOX_SN058 - SQZ_DBOX_DET_EERoom  : rtpc23
  • we checked  that the Tolm packect is correctly received by the DAC board
• SQZ_CTRL server : 2 DAC1955 boards
  • SQZ_DAC0             : DAC1955_SN070 - DBOX_SN092 - SQZ_DBOX                            : rtpc1
  • SQZ_DAC1             : DAC1955_SN112 - DBOX_SN093 - SQZ_DBOX                            : rtpc1
  • we checked  that the Tolm packects are correctly received by the DAC boards

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 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.