Agenda/Minutes of the VIS Meeting on 2020/9/11

2020/9/11 14:00 -

Participants:

Progress report

General

[Miyo] I do not work for the RSE lock trials. I'm now focusing on the preparation for O4 upgrade. It was agreed with Nakano-san who is the reader of this project and Aso-san.

Type-A

[Miyo] No

Type B

Report for the week of the 7th of September 2020.

I finished the corrections of the Type-B paper. Mark is checking the final vesion and I will submit as soon as he is finished.
Miyo-kun, Ikeda-san and I went to the mine and did ballast mass inventory (14998):
- Fabian is in the process of checking roghly how much we will need.
- We checked for rectangular ones for the top of IM, round ones for the top of BF and arch weights for IPs.
- Pictures and the actual inventory are in a new album in Google Photos: SR3 Remedying work after O3.
- Pictures of the top of SR3 IM: IM_top_1, IM_top_2, IM_top_3, IM_top_4, IM_top_5, IM_top_6. We will likely need to replace thick ones by thinner ones with the same weight and then remove from opposite corners.
In the procedure document I wrote that we must measure the bouyancy displacement effect when we to the venting. Importanrt for the adjustment of the ballast masses in BS and SR3.
- Before we did the pumping down with the contro on, so we only know the change in feedback signal. (I should use TF vales to calcilaye displacement.)
- We should do it with the control off just to measure the displacement directly.
I measured the resonant frequencies of IPs (klog 15013, 15018).
- BS, SR2 and SR3 IP require adjustment, the resonant frequencies are relatively high and there's assymetry between L and T.
- We have very small arch weights to fix the assymetry. What's the TAMS300 experience?
With Uchiyama-san I checked how to mount gauge dials around BS outter frame with the aim of assessing its displacement when Mirapro install the outer frame beams.
I tried to assess the consequence of having ferromagnetic connectors close to magnets on top of SF (klog 15011): inconclusive results.
I haven't checked Sato-san's cable alternative proposal.

Type-Bp

Checked the payload prototype in TAMA for the wire gluing.
- The gap between TM and RM is large enough to insert a stick with adhesive, but it was difficult to see the wire on TM. In actual case, we can see the wire through the mirror.

Type-C

Controls

Electronics

Towards O4

KAGRA is in "RSE Trial" now.
Procedure documents.
Preparation work.
- The preparation work will be started on Oct. 1st.
- Schedule and assignment of personnel
Acceptance Test (Wiki page).
- Example of the form in inspection document style.
Schedule towards O4.
- Two cases.

cf. Post Obs. task (Request), Task for O3c (Plan, Sheet), Task towards O4 (List)