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Editor: fabian.arellano
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  * In SR2, pin 8 of the IM yaw picomotor has a connection to the ground pin inside the chamber. This is new, but not harmful because such a pin is connected to the ground in the driver.     * In SR2, pin 8 of the IM yaw picomotor has a connection to the ground pin inside the chamber. This is new, but not harmful because such a pin is connected to the ground in the driver.
  * The ground pin of the break-out cable is not so stable, so we were measuring higher values than before. Instead, we measured resistances by touching the vacuum chamber instead.

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: 2022/8/5 14:00-

Participants:

Post O3 Upgrade portal

Schedule

  • IX:
  • EX:
  • IY:
  • EY:
  • Type-B: Damping of SR2/3 and BS. Replacement of main card for LVDT driver in SR2/3. Cable check. Preparation for review in the next week.

  • Type-Bp: Height check. Review on 8/5.

  • Type-C:

Status

  • Replacement of cables: EXT and IY/EX remain.
  • TM height setting: Type-Bp
  • Oplev: Investigation of the glitches.
  • ACC:
  • Commissioning in air:
  • Commissioning in vacuum: ALS DARM was locked.

  • Acceptance check: Dropbox paper

  • New vacuum pumps: Installation of ion pumps in IX/IY on 8/4-5. Side hatch in SRM on 8/5.
  • Heater control: Pending.
  • TMS:

Discussion

VIS Meeting

Date: 2022/8/5 14:30-

Participants:

Summary Report

Type-A

Type-B

  • Hirata-san and others replaced the master boards in the LVDT drivers in SR2 and SR3. In both cases there were reductions of the noise, especially at 10 Hz.
  • Hirata-san and others also checked again the integrity of the cables in SR suspensions. There were some concerns that we checked today:
    • In SR2, pin 8 of the IM yaw picomotor has a connection to the ground pin inside the chamber. This is new, but not harmful because such a pin is connected to the ground in the driver.
    • The ground pin of the break-out cable is not so stable, so we were measuring higher values than before. Instead, we measured resistances by touching the vacuum chamber instead.

Type-Bp

Type-C

Electronics

Control

Schedule

  • Type-A:
  • Type-B: Health check. Preparation for review.
  • Type-Bp:
  • Type-C:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 8/8 (Obon 8/11-16)

  • Takahashi: 8/9-10
  • Hirata: 8/8-10

The week from 8/15

  • Takahashi: 8/14-17 (safety shift)
  • Hirata: 8/16-19
  • Aso: 8/16-19

Next meeting

  • 2022/8/19(FRI)

KAGRA/Subgroups/VIS/VISMinutes20220805 (last edited 2022-08-05 18:40:59 by RyutaroTakahashi)