Contents
Agenda/Minutes
CRY+VIS Interface Meeting
Date: 2021/11/19 13:00-13:40
Participants: Takahashi, Ikeda, Hirata, Sato, Uchiyama, Tomaru, Ushiba, Sugiyama, Aso, Kimura
Schedule
- IX: GRX. The cavity was locked.
- EX: GRX. F0 FR was recovered. GAS LVDT coefficients were confirmed.
- IY: BF LVDT was calibrated again.
- EY: GRY. Replacement of flip cables. Preparation for ACCs.
Status
- Replacement of Flip cable: EY on 11/17. EX on 11/25. IX on 11/26.
- TM height setting: ITMY.
- Oplev: Setup of the TM Oplev in IY after the TM alignment.
- ACC: Installation to EX is scheduled on 11/24-25. Assembly for EY is ongoing. Actuator coil of H1 ACC for IY was replaced
- Commissioning in air: GRX.
- Commissioning in vacuum: Chamber closing was scheduled from 12/13.
- Overall commissioning:
- Acceptance check:
- PF actuator: At the in-vacuum commissioning.
- New vacuum pumps for V-chambers: 11/24-25 in IXV.
- Heater control:
- Power source for Oplev: EX was finished. The next target is IX.
Discussion
VIS Meeting
Date: 2021/11/19 14:00-14:30
Participants: Takahashi, Hirata, Sato, Ushiba, Fabian, Terrence, Tanaka, Sugiyama, Aso, Uchiyama, Miyoki
Summary Report
Type-A
- Recovered the F0 FR stuck in EX.
- Confirmed the LVDT coefficients of GAS filters (BF, F3, F1) in EX.
- Recalibrated the BF LVDT in IY.
- Started the assembly of accelerometers in EY.
- Replaced the flip cables.
- Replaced the coil drivers for BFV from LPCD to HPCD in IY and EY.
- Transported the accelerometers to EX.
Type-B
- SR3
- On Tuesday we checked an aparent problem we detected after installing the cable flip adapters: we were not able to measure the resistance of TM-H2 coil. We realized a gender bender was used inside of the chamber, with the effect of flipping the pins. We just connected the cable without the flip adapter using a non-flipping fake gender bender.
- We detected that a pin of the F1 FR cable had a connection to the chamber (GND). This is likely the reason the FR is not working. It seems it would work using an stand-alone driver (not in klog yet).
- On Friday we realigned the oplev according to the requirements of the green beam alignment.
- BS
- We replaced the original LVDT card for the three GAS filters as preparation for testing the converter from double-ended to single-ended output for the reference signal.
- The new board had additional connections to improve the noise performance.
- We measured the resistances in the old board and "copied" them onto the new board.
- Then I adjusted the calibration factors and offsets in the medm screens using the old transfer functions as references.
- This approach seemed to be successful for the BF but not for F0. We should calibrate F0 sometime next week.
- We tested the converter from double-ended to single-ended output for the reference signal.
Type-Bp
Type-C
Electronics
Control
Schedule
See Schedule
- Type-A team: Installtion of ACCs to EX.
- Type-B team: Measurement of BS box, WAB, Calibration of SF.
Safety
Discussion
Travel Plans
(Date in Kamioka)
The week from 11/22
- Takahashi: 11/24-26
- Sato: 11/24-26
- Hirata: 11/24-26
The week from 11/29
- Takahashi: 11/29-12/3
- Sato: 11/29-12/3
- Hirata: 11/30-12/3
Next meeting
- 2021/11/26(FRI)