Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date: 2021/9/3 13:00-

Participants:

Post O3 Upgrade portal

Schedule

• IX: In finalization. Health check.
• EX: In finalization. Health check. Installation of ACCs should be scheduled.
• IY: TM height was adjusted/measured on 9/1.
• EY: Weight and Yaw were adjusted on 9/2. Chamber closing is scheduled on 9/6-8.

Status

• TM height setting: Height of ITMY/ETMY was measured.
• Commissioning in air: Health check. Oplev setting.
• Commissioning in vacuum:
• Overall commissioning:
• Acceptance check: Every Friday.
• PF actuator: At the in-vacuum commissioning.
• New vacuum pumps for V-chambers:
• Heater control:

Discussion

VIS Meeting

Date: 2021/9/3 14:00-

Participants:

Summary Report

Type-A

• Adjusted the height of GAS filters and measured the height of TMs in IY and EY.

Type-B

• Satou-san warned us that the geophone cables requires special attention. The cable shield (connected to pin 5) should not touch anything metallic.
• It seems the solution provided my Mark in the past was better. We should look more into it.

Type-Bp

We assessed the health of the in-vacuum cables by measuring resistances, capacitances and inductances from the outside of the chamber at the flanges.

• PR2:

  • The only anomaly was that we found a 8.05 MΩ path between pin 2 and the chamber in the BF picomotor connector (Flange 4, connector 3). We never use these picomotors, so this problem should not have important consequences.

  • We still have to measure some inductances.
• PR3:

  • In the BF picomotor connector, it's not possible measure the correct capacitance between pins 1 and 6, which should be around 190 nF. This is not expected to be a problem because we tend to nerver use those picomotors.

  • This situation is strage because Ikeda-san used these picomotors many months ago.
• PRM will be next.

Type-C

Electronics

Control

Schedule

See Schedule

• Type-A team: Preparation for accelerometers.
• Type-B team:

Milestone

• IMC suspensions are ready in air [40] will finish 2021/04/21.

• PRs are ready in air [643] will finish 2021/07/09.

• ETMX is ready in air [656] will finish 2021/08/25.

• ITMX is ready in air [657] will finish 2021/08/31.

• ETMY is ready in air [658] will finish 2021/09/16.

• ITMY is ready in air [659] will finish 2021/11/08.

• BS is ready in air [691] will finish 2021/11/24.

• SRs are ready in air [663] will finish 2021/12/20.

• Output suspensions are ready in air [695] will finish 2021/12/21.

• TMSY is ready in air [708] will finish 2021/??/??.

• TMSX is ready in air [684] will finish 2021/??/??.

2021/03/29 updated

Safety

Discussion

Travel Plans

The week from 9/6

• Takahashi: 9/6-10
• Sato: 9/6-10
• Hirata: 9/6-9
• Yano: 9/6-10

The week from 9/13

Next meeting

• 2021/9/10(FRI)