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

2020/9/11 14:00 -

Zoom Meeting

Participants:

Progress report

General

[Miyo] No

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.

  • Type-A tower installation

  • Limit switches

  • Replacement of TF blades

  • Wire gluing in PR3

  • Type-B remedying work

• 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)

Safety

Discussion

Travel Plans

Next meeting

• On 2020/9/18(Fri)