Agenda/Minutes on 2020/10/16

Zoom Meeting

CRY+VIS Interface Meeting

13:30-14:00

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

• Post O3 Upgrade portal

• Cable bandling bellow BF.(Assy small hexagon for BF-CRYO.pdf)

• PF actuator

• IP monitoring improvement in vacuum pumping -> auto-tracking system

• safe mode switching schedule of WAB
• Yano-san's schedule

VIS Meeting

14:00-15:30

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

Progress report

General

[Fabian]

• I wrote a document about the procedure to replace the LVDT cards after a failure: JGW-T2012128.

  • It was checked by Alessandro Betolini from Nikhef and he says the method is correct. He provided minor comments that have been incorported to the new version of the document.
  • He says they will review the design for ETpathfinder and that's our chance to give them feedback (i.e. Tanaka-san's findings and my concerns as a user).
  • Knowledge transfer from Tanaka-san to Alessandro would be greatly beneficial for KAGRA. If you think it's suitable, would it be possible for someone to organize this, please?
• Tanaka-san will take some of our LVDT cards for hardware modification.

  • We need to survey those LVDT cards before he takes them away. When will we do this?

  • As far as I understand, given the old calibration factor, he has to give us a procedure to calculate a new calibration factor. Is this statement correct?

  • Before any other card breaks, we need to survey all of them. When will we do this?

  • Four hands are required for the measurements. For Type-B/Bp, Washimi-san and Fabian can do it.

• After cleaning the PR area I have the impression we lost Hirose-san's LED lamps to check mirror cleanliness.

[Washimi]

• Cleaning results

Type-A

• We went to clean-up of each clean booth.

Type-B

• I gave some feedback for the noise budget paper.
• We finished the cleaning with a lot of help.
• Hirata-san made M6 holes in some ballast masses.
• We removed some cables from chassis for the cleaning procedure.
• I put the fibre optic camera in the PR clean booth buffer area.
• We recovered the suspensions after blackout. They all went to ALIGNED state well.
• The temperature has decreased a lot inside the clean rooms, likely due to an increase of cold air circulation after turning all FFUs on. A couple of DC control loops in GAS filters are about to saturate. I've reported this to Miyoki-san and he turned on some heaters.

Type-Bp

• After the blackout PR2 went to ALIGNED state well. PR3 and PRM oplevs were removed before recovery and I just checked they went to TWR_DAMPED state. I can turn the IM control system on by hand to check the health of IM-OSEMS.
• Just for the record for new comers: I realized PR use different amplitudes of reference signals for the LVDTs. According to labels attached to signals generators:
  • PR2: 6 Vpp.
  • PR3 and PRM: 7 Vpp.

Type-C

Controls

Electronics

• More two channels are not available in 1U chassis. 2U chassis are necessary with bridge cable.
• Cables for the primary coils can connected to the LVDT driver directly. Signals for secondary coils are exchanged inside the chassis.

Towards O4

• RSE Trial was finished on Oct. 13th.
• Preparation work is on going.

  • Inventory sheet.

  • Stock record.

  • Cleaning by the company

  • Monitoring for vent. Date: 19(only EYV), 22-25(practically 22-23). Charge: Miyo, Ikeda, Fabian, Takahashi
  • Guardian update is planed on 21 in PR and BS.
• Schedule.

  • Chamber opening

  • VIS

• 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.

Safety

Discussion

Travel Plans

The week from 10/19

• Takahashi: 10/19-23

The week from 10/26

• Hirata: 10/26-30

Next meeting

• On 2020/10/23(Fri)