• KAGRA
• Subgroups
• VIS
• VISMinutes20220930

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2022/9/30 13:00-13:25

Participants: Takahashi, Aso, Yokozawa, Ikeda, Mitsuhashi, Ushiba, Akutsu, Sato, Node

Post O3 Upgrade portal

Schedule

• Type-A: Offload of the BF GAS in IY. Replacement of the HPCD in EX. Test of the Observation mode.
• Type-B: Windshield in BS.
• Type-Bp: Windshield in PR2/PR3. Monitoring of the PRM in the next week.
• Type-C: Health check of the IMMT suspensions. Recovery of the OMMT1/2/OSTM suspensions. Final check of the OMMT/OSTM suspensions in the next week.

Status

• Replacement of cables: EXT remains.
• TM height setting:
• Oplev: Windshields.
• ACC: Evaluation.
• Commissioning in vacuum: Locking for a long time.

• Acceptance check: DropboxPaper

• Vacuum system: Closing of the IMMT-IFI-PRM chambers. Leak check.
• Heater control: Test in IY will be planned.
• TMS: Implementation of the viewport in TMSY in the next week.

Discussion

VIS Meeting

Date: 2022/9/30 14:00-14:20

Participants: Takahashi, Washimi, Ushiba, Tanaka, Fabian, Aso

Summary Report

Type-A

• Offloaded the BF GAS in IY.
• Evaluated the accelerometers for the IPs. The performance was worse than the prediction.

Type-B

• We build a new windshield for the BS oplev.
• In SR2, the seismometer on ground was calibrated with respect to the IP LVDTs and geophones.
• In SR2, the sensor correction filter Terrence designed for SRM was copied to SRM filter banks for temporary usage.
• In BS, a leak was found in an electrical feedthrough, we disconnected the cables to facilitate this work.

Type-Bp

Type-C

• Took photos of the EQ stoppers and the damping magnets in the IMMT suspensions.
• Recovered the touching points in the OMMT/OSTM suspensions.

Electronics

Control

Schedule

• Type-A:
• Type-B:
• Type-Bp: Monitoring of the PRM.
• Type-C: Final check of the OMMT/OSTM suspensions.

Safety

• Regulation to use the clean booth will be changed.

Discussion

Travel Plans

(Date in Kamioka)

The week from 10/3

• Takahashi: 10/3-7
• Hirata: 10/4-7
• Aso: 10/3-6

The week from 10/10

• Takahashi:
• Sato:
• Hirata:

Next meeting

• 2022/10/7(FRI)