Agenda/Minutes on 2020/10/30

Zoom Meeting

CRY+VIS Interface Meeting

13:00-

Participants:

• Post O3 Upgrade portal

• Schedule: Wire disconnection (IX 11/13, EX 11/19), WAB safe mode (10/26-11/13).
• FC painting.
• IP monitoring in the next venting on 11/4 and 11/20.
• Start time of this meeting.

VIS Meeting

14:00-

Participants:

Progress report

General

Type-A

• Tested the ribbon heaters in the X-end. The heaters on the cross tube (klog) and top chamber (klog) affected the height of F3/BF and F0 respectively. The temperature of BF was changed little (<0.1deg). The temperature control of heater itself is meaningful to keep the height of GAS filters.

Type-B

[Fabian]

• I watched Mirapro removed the bellows and ducts, especially around BS, wich still has its oplev. Everything seemed alright. Let us measure TFs once the DGS is recovered.
• I asked Uchiyama-san about the BS outter frame beams. He will talk about this with Mirapro next week.
• Hirata-san picked up some components, which we will use in vacuum, in order to wash them in Mitaka.
• Hirata-san brought into the mine the SR IP fixing jig and F0 top plate replacement.

  • Why do we need to IP fixing jig for SR? I think we need it only for BS because we will remove the IP LVDTs
    

  • Where's the IP fixing jig for BS?

• Venting finished on Monday. The buoyancy effect on keystones was reported in klog 15322. This is very useful information for BS and SR3 work.

• Once Mirapro removed the hatch doors in BS chamber that are at the BF level, I took a look and identified places to put the ballast masses. See klog 15353.

Possible ctivities for the next weeks (subject to Takahashi-san's approval):

• Shimode-san and Yokozawa-san need to inspect SR3 and SR2 racks. I'll help them with that.
• Visual inspection of SRM IM looking for a cable pulling.
• Removing clamps from the vacuum chambers caps. Mirapro will not do it. People without hernia are required.
• Opening of SRM side door. People without hernia are required.
• Move IP ballast masses to the 2nd floor of the clean room.
• Prepare pallet (or plastic beam replacement) for BS chamber cap.
• Recovery of oplevs.
• Measurement of gain resistances and phases in LVDT cards.

• On BS BF filter, some ballast masses are fastened with a very long screw. Because we will add mass there, it would be good to estimate the length of the screw for preparation. In order to place a ruler next to it safely, it would be good to open the chamber and lock the IP, together with the BF cap.

Type-Bp

• Hirata-san talked with Shoda-san about how to check Traverser cables.
• Mirapro removed ducts and bellows.

Type-C

• [Sato] IMMT2 modification parts was delivered at Oct.28.

Controls

Electronics

Towards O4

• Chamber opening and DGS update are on going.
• Schedule.

  • Arrangement of personnel in Nov. (table)

  • VIS

• Procedure documents.

  • Type-A tower installation

  • Limit switches

  • Limit switch connecting guide <-- revised by Ikeda-san

  • Replacement of TF blades

  • Wire gluing in PR3

  • Type-B remedying work

• Criteria in the acceptance test.

Safety

Discussion

Travel Plans

The week from 11/2

• Takahashi: 11/1-6
• Sato: 11/1-6
• Hirata: 11/1-6

The week from 11/9

• Takahashi: 11/9-13
• Sato: 11/9-12
• Hirata: 11/9-13

Next meeting

• On 2020/11/6(Fri)