Differences between revisions 8 and 14 (spanning 6 versions)
⇤ ← Revision 8 as of 2022-10-21 11:05:24 →
Size: 3355
Editor: fabian.arellano
Comment:
← Revision 14 as of 2022-10-21 13:46:52 → ⇥
Size: 3659
Editor: RyutaroTakahashi
Comment:
Deletions are marked like this. Additions are marked like this.
Line 8: Line 8:
Date: 2022/10/21 13:00- Date: 2022/10/21 13:00-13:15
Line 10: Line 10:
Participants: Participants: Takahashi, Sato, Ikeda, Hirata, Uchiyama, Ushiba, Akutsu
Line 18: Line 18:
 * Type-C:  * Type-C: Oplev for IMMT1 was disassembled. The backside cover for the OMMT2 suspension was removed.
Line 26: Line 26:
 * Vacuum system: Leak test in IMM, IFI, PRs, and TMSY.  * Vacuum system: Leak test in IMM, IFI, PRs, and TMSY. No large leak.
Line 34: Line 34:
Date: 2022/10/14 13:30- Date: 2022/10/14 13:30-13:45
Line 36: Line 36:
Participants: Participants: Takahashi, Uchiyama, Ushiba, Fabian, Tanaka, Lucia
Line 42: Line 42:
* SR3:  * SR3:
Line 53: Line 53:
  * Lucia tested the blending of the geophones with the corrected LVDTs,and the inertial dampiong. It seems to be working fine.   * Lucia tested the blending of the geophones with the corrected LVDTs,and the inertial damping. It seems to be working fine.
Line 56: Line 56:
 * Lucia implemented and tested strong damping control in PRM.
Line 76: Line 77:
 * Sato: 10/25-28

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: 2022/10/21 13:00-13:15

Participants: Takahashi, Sato, Ikeda, Hirata, Uchiyama, Ushiba, Akutsu

Post O3 Upgrade portal

Schedule

  • Type-A: Test of the heater control in IY.
  • Type-B: Optimization of the IP controls (Diagonalization, Calibration, Sensor correction).
  • Type-Bp: Test of the strong damping in PRM.
  • Type-C: Oplev for IMMT1 was disassembled. The backside cover for the OMMT2 suspension was removed.

Status

  • Replacement of cables: EXT remains.
  • Oplev: Windshield in IMMT2.
  • ACC: Repair of the geophone for spare.
  • Commissioning:

  • Acceptance check: DropboxPaper

  • Vacuum system: Leak test in IMM, IFI, PRs, and TMSY. No large leak.
  • Heater control: Test in IY.
  • TMS:

Discussion

VIS Meeting

Date: 2022/10/14 13:30-13:45

Participants: Takahashi, Uchiyama, Ushiba, Fabian, Tanaka, Lucia

Summary Report

Type-A

  • The BF GAS in IY had been saturated in the last weekend (not monitored). The setpoint of the heater control was changed from 30C to 25C. The BF GAS was recovered.

Type-B

  • SR3:
    • IP LVDT and geophone diagonalization, actuation diagonalization.
    • Inter-calibration between LVDTs, geophones and ground seismometer.
    • Sensor correction with an improvement of 2.5 times in the integrated rms.
    • A bump appeared in the IP geophone TFs, very much like in SR2 in the past. New geophone calibration TFs were calculated, implemented in filter banks and are working fine.
    • Inter-calibration between geophones and LVDTs were calculated again but not yet written in filter banks.
  • SR2:
    • It seems the resonance in IP-L appears at different frequencies, depending whether it's measured with the force TF or the IP free-swing ASD (66 and 80 mHz respectively). Double-checking this seems necessary.
    • I removed the sensor and actuation diagonalization matrices that I had implemented last week because they introduced large coupling at some frequencies. Nevertheless, Lucia realized that diagonalization of only actuation is beneficial.
    • I implemented inter-calibration with the seismometer on the ground and then implemented the LVDT sensor correction. With the microseimic conditions at the time, the seismoc noise in the LVDT decreased by 5.8 and 6.6 in L and T respectively, without increasing the rms.
  • Beam splitter:
    • Lucia tested the blending of the geophones with the corrected LVDTs,and the inertial damping. It seems to be working fine.
    • Ushiba-san implemented low noise control for the payload.

Type-Bp

  • Lucia implemented and tested strong damping control in PRM.

Type-C

Electronics

  • Repaired the broken geophone pod which was replaced with the spare geophone in SR2. We had three geophone pre-amps as spares, but they are the old type boards with opposite side sockets for the feedthrough. I made a special ribbon cable to connect to the feedthrough.

Control

Schedule

  • Type-A:
  • Type-B: Optimization of IP controls.
  • Type-Bp:
  • Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 10/24

  • Hirata: 10/25-28
  • Sato: 10/25-28

The week from 10/31

  • Takahashi:
  • Hirata:
  • Sato:

Next meeting

  • 2022/10/28(FRI) 13:30

KAGRA/Subgroups/VIS/VISMinutes20221021 (last edited 2022-10-21 13:46:52 by RyutaroTakahashi)