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Editor: RyutaroTakahashi
Comment:
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Date: 2022/4/15 13:00- Date: 2022/4/15 13:00-13:50
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Participants: Participants: Aso, Ushiba, Tomaru, Akutsu, Kimura, Ikeda, Miyoki, Takahashi, Sato, Hirata
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 * IX:  * IX: F0 overload
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 * Type-B/Bp/C: BFH LVDT was recovered in PRM. Leak in IMC.  * Type-B/Bp/C: BFH LVDT was recovered in PRM. Power supply trouble was due to the broken cooling fan. Leak in the IMC chamber was recovered.
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 * Oplev: Calibration in EY. Windshield in the next.
 * ACC: 		 * Oplev: Calibration results were summarized. Windshield in the next.
 * ACC: Investigating the noise source.
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 * Commissioning in vacuum:  * Commissioning in vacuum: Alignment of the MCE and the X-arm is scheduled in the next week.
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 * TMS: Pressure was increased in EXT.  * TMS: Pressure fluctuation was due to the valve operations. Two vacuum gauges were broken.
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Date: 2022/4/15 14:00- Date: 2022/4/15 14:00-14:30
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Participants: Participants: Takahashi, Ushiba, Fabian, Washimi, Tanaka, Uchiyama
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 * Recovery of the TM actuator in EY.
 * Saturation of the F0 keystone height.
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Nothing
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 * We replaced a broken LVDT in PRM. Namely, the one for the BF Damper horizontal LVDTs:
  * In the old board, we measured the resistance values determining two gains, and copied them into the new board.
  * After installing the new board, we adjusted the phases in order to achieve maximum output.
  * Then, in order to calculate the new LVDT calibration factors, we measured the transfer functions from Y actuation to H1, H2 and H3 outputs, and compared with previous measurements.
  * The DC amplitudes and phases of transfer functions are the same as before.
 * Hirata-san continued working in the design of the Traverser limit switches. Differences between the real hardware and the 3D-CAD have made the process difficult, but he's now working on a final version. He has reported his work at the ATC-KAGRA meeting.
 * Takahashi-san realized that the LVDT drivers used in PR3 and PRM are using a reference signal with an amplitude of 12 Vpp.
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 * Replaced the feedthrough flange with the blank flange in OMC.
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 * Type-A team:
 * Type-B team: 		 * Type-A team: Finalization in IY.
 * Type-B team: SF FR grounded problem in SR3.

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: 2022/4/15 13:00-13:50

Participants: Aso, Ushiba, Tomaru, Akutsu, Kimura, Ikeda, Miyoki, Takahashi, Sato, Hirata

Post O3 Upgrade portal

Schedule

  • IX: F0 overload
  • EX:
  • IY: Health check. Go to finalization (WAB, Frame adjustment).
  • EY: TM actuator problem (flip cable, regluing of magnet).
  • Type-B/Bp/C: BFH LVDT was recovered in PRM. Power supply trouble was due to the broken cooling fan. Leak in the IMC chamber was recovered.

Status

  • Replacement of flip cables: Cables for TMS were ordered. Feedthrough flange was replaced with the blank flange in OMC.
  • TM height setting: ITMY.
  • Oplev: Calibration results were summarized. Windshield in the next.
  • ACC: Investigating the noise source.
  • Commissioning in air:
  • Commissioning in vacuum: Alignment of the MCE and the X-arm is scheduled in the next week.
  • Acceptance check:
  • PF actuator: At the in-vacuum commissioning.
  • New vacuum pumps for V-chambers:
  • Heater control: Test is pending.
  • TMS: Pressure fluctuation was due to the valve operations. Two vacuum gauges were broken.

Discussion

VIS Meeting

Date: 2022/4/15 14:00-14:30

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

Summary Report

Type-A

  • Recovery of the TM actuator in EY.
  • Saturation of the F0 keystone height.

Type-B

Nothing

Type-Bp

  • We replaced a broken LVDT in PRM. Namely, the one for the BF Damper horizontal LVDTs:
    • In the old board, we measured the resistance values determining two gains, and copied them into the new board.
    • After installing the new board, we adjusted the phases in order to achieve maximum output.
    • Then, in order to calculate the new LVDT calibration factors, we measured the transfer functions from Y actuation to H1, H2 and H3 outputs, and compared with previous measurements.
    • The DC amplitudes and phases of transfer functions are the same as before.
  • Hirata-san continued working in the design of the Traverser limit switches. Differences between the real hardware and the 3D-CAD have made the process difficult, but he's now working on a final version. He has reported his work at the ATC-KAGRA meeting.
  • Takahashi-san realized that the LVDT drivers used in PR3 and PRM are using a reference signal with an amplitude of 12 Vpp.

Type-C

  • Replaced the feedthrough flange with the blank flange in OMC.

Electronics

Control

Schedule

See Schedule

  • Type-A team: Finalization in IY.
  • Type-B team: SF FR grounded problem in SR3.

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 4/18

  • Takahashi: 4/19-22
  • Sato: 4/19-22
  • Hirata: 4/19-22

The week from 4/25

  • Takahashi: 4/25-28
  • Sato: 4/25-28
  • Hirata: 4/25-28

Next meeting

  • 2022/4/22(FRI)

KAGRA/Subgroups/VIS/VISMinutes20220415 (last edited 2022-04-15 17:57:25 by RyutaroTakahashi)