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Editor: RyutaroTakahashi
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Date: 2022/10/14 13:00- Date: 2022/10/14 13:00-13:15
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Participants: Participants: Takahashi, Akutsu, Tomaru, Mitsuhashi, Ushiba, Uchiyama, Yokozawa, Aso, Miyoki, Hirata, Kimura, Ikeda
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 * Oplev:  * Oplev: Stabilization of the light source.
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 * Commissioning in vacuum: FPMI lock with low noise suspension controls.  * Commissioning: FPMI lock with low noise suspension controls.
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 * Vacuum system: Reak test in BS. Pump down of the TMSY from 10/12.  * Vacuum system: Reak test in BS was finished. Pump down of the TMSY was started on 10/12. Leak test in IMM, IFI, PRs, and TMSY in the next week.
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 * BS sensor correction implemented. It seems to be working fine. Noise budget and a deeper analysis of its performance are ongoing.
 * In BS too, tentative blending filters could be implemented and tested next week.
 * I tracked down the location of the data used for the calibration of BS geophones. I'll do the calibration again, just for our information.
 * I compared the geophone outour in SRM, SR2 and SR3. They are all similar but there are differences. I'll check again next week.
 * In SR2, I did IP LVDT and actuator diagonalization. The difficulty is that the resonance frequencies in L and T are both very close to 66 mHz. Some coupling reduced, but from Y to T, actuation coupling increased to 20% of the resonance in T. I want to revert to previous values of the diagonalization matrices.
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 * PRM: mechanical suspension models of TM have been uploaded on the filter banks.
 * Control filters for strong damping is ready to be tested next week
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 * 2022/10/21(FRI)  * 2022/10/21(FRI) 13:30

Contents

  1. Agenda/Minutes
  2. CRY+VIS Interface Meeting
    1. Schedule
    2. Status
    3. Discussion
  3. VIS Meeting
    1. Summary Report
      1. Type-A
      2. Type-B
      3. Type-Bp
      4. Type-C
      5. Electronics
      6. Control
    2. Schedule
    3. Safety
    4. Discussion
    5. Travel Plans
    6. Next meeting

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2022/10/14 13:00-13:15

Participants: Takahashi, Akutsu, Tomaru, Mitsuhashi, Ushiba, Uchiyama, Yokozawa, Aso, Miyoki, Hirata, Kimura, Ikeda

Post O3 Upgrade portal

Schedule

  • Type-A: Offload of the GAS filters in IX. Test of the heater control in IY.
  • Type-B: Diagonalization of the IP in BS/SR2. Sensor correction in BS.
  • Type-Bp:
  • Type-C:

Status

  • Replacement of cables: EXT remains.
  • Oplev: Stabilization of the light source.
  • ACC: Evaluation.
  • Commissioning: FPMI lock with low noise suspension controls.

  • Acceptance check: DropboxPaper

  • Vacuum system: Reak test in BS was finished. Pump down of the TMSY was started on 10/12. Leak test in IMM, IFI, PRs, and TMSY in the next week.
  • Heater control: Test in IY.
  • TMS: Evacuation of TMSY.

Discussion

VIS Meeting

Date: 2022/10/14 14:00-

Participants:

Summary Report

Type-A

  • Offloaded the GAS filters in IX.
  • Testing the heater control in IY.

Type-B

  • BS sensor correction implemented. It seems to be working fine. Noise budget and a deeper analysis of its performance are ongoing.
  • In BS too, tentative blending filters could be implemented and tested next week.
  • I tracked down the location of the data used for the calibration of BS geophones. I'll do the calibration again, just for our information.
  • I compared the geophone outour in SRM, SR2 and SR3. They are all similar but there are differences. I'll check again next week.
  • In SR2, I did IP LVDT and actuator diagonalization. The difficulty is that the resonance frequencies in L and T are both very close to 66 mHz. Some coupling reduced, but from Y to T, actuation coupling increased to 20% of the resonance in T. I want to revert to previous values of the diagonalization matrices.

Type-Bp

  • PRM: mechanical suspension models of TM have been uploaded on the filter banks.
  • Control filters for strong damping is ready to be tested next week

Type-C

Electronics

  • Prototyping the geophone pre-amp.

Control

Schedule

  • Type-A: Investigation of ACCs.
  • Type-B: IP control.
  • Type-Bp:
  • Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 10/17

  • Takahashi: 10/17-19
  • Hirata:
  • Sato: 10/18-21

The week from 10/24

  • Takahashi:
  • Hirata:
  • Sato:

Next meeting

  • 2022/10/21(FRI) 13:30

KAGRA/Subgroups/VIS/VISMinutes20221014 (last edited 2022-10-14 14:51:54 by RyutaroTakahashi)