Agenda/Minutes on 2021/1/8

Zoom Meeting

CRY+VIS Interface Meeting

13:30-13:55

Participants: Takahashi, Hirata, Sato, Yano, Aso, Miyo, Ushiba, Tomaru, Ikeda, Kimura, Hagiwara

Post O3 Upgrade portal

• Schedule for IX: Connection of ITMX was scheduled on 2/9.
• Schedule for IY: Cooling of payload is scheduled from 1/12.
• Schedule for EX: Let's discuss in the next time.
• Corrugate tube fixing jig: Re-measurement at the beginning of March in IYV is planed.
• Commissioning in vacuum:
• Acceptance check items:
• Jig for FC painting: Under manufacturing.
• PF actuator: by the end of January.

VIS Meeting

14:00-15:00

Participants: Takahashi, Tanaka, Fabian, Sato, Hirata, Aso, Miyo, Washimi

Progress report

General

Type-A

• Remedy work in IXV.
  • Replaced three blades for TF.
  • Mounted the ballast weight on the top plate of TF keystone.
  • Assembled and tested the limit switches for the yaw and vertical FR.
  • Assembled the geophones into the pods.

Type-B

Albums

• BS remedying work after O3

• SR2 remedying work after O3

• SR3 remedying work after O3

• SRM remedying work after O3

Week of the 4th of January

SR3

• In order to answer the question whether we should move the assembly frame next to SR3 as a back up plan,
  • We opened SRM chamber -X door, next to where the frame is now and
  • We measured the width of the clear space: 66 cm, which is enough.
  • We should ask Mirapro to move the frame, but
  • We need to move the rack with electronics and the cables and we need to allocate time to do it.
• The IP stepper motor shaft pitch was measured to be 1.0 mm/thread.

BS

• The IP stepper motor shaft pitch was measured to be 0.8 mm/thread.
• We received special screws, we installed the IP LVDTs and calibrated them: I have not checked the data but we might need to optimize the LVDT cards and repeat the calibration. I need to think about this issue more carefully.
• Before removing IP immobilizing jig we measured the output of the LVDTs in order to recover the aligned position.
• We replaced the heavy F0 top plate of the keystone assembly by a lighter one with ballast mass.
• We installed the F0 yaw stepper motor with limit switches. Test pending.
• We installed the F0 fishing rod limit switches. Test pending.

Type-B all

We checked the flanges we could use for the cables of a thermistor. See details in klog 15700.

Type-Bp

• If travel for Kamioka was limited, remedy work in PR3 would be postponed to February.

Type-C

Controls

Electronics

• Made the ver.2 LVDT combiner circuit. Preliminary result showed enough attenuation. The circuit board will be sent to Kamioka in the next week.

Towards O4

• Type-B remedy work is on going.
• Remedy work in IXV was started. Type-A team will go to installation in EYV parallelly.
• Schedule.

  • Chart

• Procedure documents.

  • Type-A tower installation

  • Limit switches

  • Limit switch connecting guide

  • Replacement of TF blades

  • Wire gluing in PR3

  • Type-B remedying work

• Criteria in the acceptance test.

  • Inspection document (sample)

Safety

Discussion

Travel Plans

The week from 1/11

• Takahashi: -1/15
• Sato: -1/15
• Hirata: -1/15
• Yano: -1/15

The week from 1/18

• Takahashi: ?
• Sato: 1/18-22
• Hirata: ?
• Yano: 1/18-22

Next meeting

• On 2020/1/15(Fri)