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• VIS
• VISMinutes20210305

Agenda/Minutes

Zoom Meeting

CRY+VIS Interface Meeting

Date : 13:30-13:45

Participants :

Post O3 Upgrade portal

Schedule

• IX: Setting Oplev by 3/10. Preparing additional spring for BF.
• IY: Disconnection is scheduled on 3/11.
• EX: Connection is scheduled in the week of 3/15.

Status

• Corrugate tube fixing jig: Started the vent of IYV chamber on 26th. Re-measurement is on going in 2/25-3/2 at IYV.
• Commissioning in air: Commissioning of IX will be delay. From April?
• Commissioning in vacuum: From May?
• Acceptance check: Cryo-payload in IX/EX and Type-A tower in EY/IX are on going.
• PF actuator: Not evaluated in IX, but after the commissioning for suspension.
• Jig for FC painting: Assembling.
• Overall commissioning: To be considered about personnel.

Discussion

• [Miyo] オフロード作業を無くすためのアイデア募集
  • 問題意識：真空圧力が変わるとIPが傾いてPayloadが自身のEQフレームに当たる。（完全に傾かないようにする治具はそもそも不可能なので、傾いても大丈夫なアイデアがほしい。）

  • [Miyo] そもそも、IPが傾いてIPのEQストップに当たった状態でもPayloadも同じく当たらないよう十分に退避させれば良い話に思える。その場合、IPがEQに当たった状態でFRをつかってもとに戻せるかどうか確認すべき。これはAcceptanceCheckに追加すべきか？

VIS Meeting

14:00-14:30

Participants: Takahashi, Hirata, Miyo, Sato, Fabian, Sugiyama, Ishizaki, Aso, Terrence, Tanaka

Schedule

Old? VIS schedule is in Microsoft project

Progress report

TypeA

• Replacement of LVDT coils for F0 in EX.

TypeB

TypeBp

TypeC

• Investigation and recovery of IMC suspensions are requested.

Electronics

Control

Safety

Discussion

• O3GK Noise Budget : Seismic noise through the Type-A tower

  • https://gokagra.slack.com/archives/C015M111B5G/p1611978135005400

  • Calculation for the ETMY : much smaller than O3GK sensitivity, but larger than the design sensitivity

Travel Plans

The week from 3/1

• Takahashi: 3/1-5
• Sato: 3/1-5
• Hirata: 3/1-5
• Yano: 3/1-5

The week from 3/8

• Takahashi: 3/8-3/12
• Sato: 3/8-3/12
• Hirata: 3/8-3/12
• Yano: 3/8-3/12

Next meeting

• 2021/3/5(FRI)