Agenda/Minutes of the VIS Meeting on 2020/9/18

2020/9/18 13:30 - 14:40

Zoom Meeting

Participants: Takahashi, Sato, Aso, Hirata, Miyo, Tomaru, Akutsu, Ushiba, Fabian, Terrence, Shoda, Washimi

Interface between VIS and CRY

• Interface meeting was set to discuss about the integrated CAD model, the link between Cryo-payload and Type-A tower, the schedule, and so on. Mainly in Japanese for the engineers.

• Post O3 Upgrade portal

• VIS team plan to test the ribbon heater on the cross tube in IX or IY just before the vent of chambers.

• Acceptance Test (Wiki page, Inspection document style). The check points with criteria should be reviewed.

• The schedule will be discussed in the next meeting.

Progress report

General

Type-A

• Planing a test of the ribbon heater on the cross tube in IX or IY just before the vent of chambers.

Type B

• Mark finished checking the paper. I'll submit it within a few days.
• Preparation work with suspensions:

  • In BS, SR2 and SRM GAS filters I offloaded coil-maget actuation onto fishing rods (klog 15027, 15039, 15042).

  • In BS F1 I was able to move the keystone down to 230 um. Before the lowest the FR would allow was 488 um. I changed the setpoint accordingly and together with Miyo-kun I updated BURT and SDF files (klog 15027).

  • The temperature was relatively high at the moment (above 24 degrees; klog 15040). I told Moyoki-san and he installed coolers (klog 15043). The temperature has been dropping since then (klog 15052). It's now 23.2 degrees arond BS.

  • I'll offload again once the DC actuation in GAS filters stops drifting.
  • I'll measure IP resonant frequencies again.
  • I told Takahashi-san about the yokes in BS IP coil-magnet actuators. They require cleaning and nickel coating.
• I went to the tunnel with Miyo-kun and cheked the holders for the gauge dials. We'll need to but longer rods. I'll let Takahashi-san know.
• Highlight in documentation:

  • Shoda-san, Takahashi-san, Hirata-san and Miyo-kun gave me feedback about the document. Thank you very much!

  • An overall BS procedure is now readable.
  • Hirata-san checked the section about the Lower Breadboard (LBB) and provided a picture for SR3 section.
  • I added a secton on how to set the fishing rods to mid-range position.
    • During installation we measured the total range of the motor in number of steps.
    • For the FRs that are at the end of their ranges we just have to move them by half of the total range.
  • I added a section about monitoring the IPs during venting. I got feedback and updated the document.

Type-Bp

Type-C

Controls

• Real-time model modification for Type-B/Bp is suspended due to the RSE Trial now.

Electronics

Towards O4

• KAGRA is in "RSE Trial" now.
• Procedure documents.

  • Type-A tower installation

  • Limit switches

  • Limit switch connecting guide

  • 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

  • Cleaning procedure.

  • When you make inventories, indicate the segment name.

• Schedule towards O4.

  • Two cases.

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

Safety

Discussion

Travel Plans

The week from 9/28

• Takahashi: 9/30-10/2
• Sato: 9/30-10/2
• Hirata: 9/30-10/2

The week from 10/5

• Takahashi: 10/5-9
• Sato: 10/5-9
• Hirata: 10/5-9

Next meeting

• On 2020/9/25(Fri)