Agenda/Minutes on 2020/10/30

CRY+VIS Interface Meeting

13:00-13:50

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

Post O3 Upgrade portal
Schedule: Wire disconnection (IX 11/13, EX 11/19), WAB safe mode (10/26-11/13).
Jig for the FC painting. LED light is necessary.
IP monitoring in the next venting on 11/4 and 11/20.
PF actuator: Measurement of coefficients and calculation of the noise (by mid Dec.).
Time of this meeting. 13:30 to 14:00, extended to 14:30.

14:00-15:00

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

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.

[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 BS and 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
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.

The week from 11/2

The week from 11/9

KAGRA/Subgroups/VIS/VISMinutes20201030 (last edited 2020-10-30 15:04:14 by RyutaroTakahashi)