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2020/5/22 14:00 - 2020/5/22 14:00 - 15:20
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Participants: Participants: Takahashi, Hirata, Fabian, Miyo, Sato, Shoda, Aso, Lucia, Tanaka
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[[https://www.dropbox.com/s/60oygtwmckmdyj6/Towards%20O4%20on%20VIS%20.xlsx?dl=0|Task list towards O4]] [[https://onedrive.live.com/view.aspx?resid=8E8081C20FE5EC3A!2278&ithint=file,xlsx&authkey=!AMFNtNa-Y6CVp94|Task list towards O4]]
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  * I don't know what's the origin of the failure. It wasn't an actuation overload due to an earthquke because there was no earthquake (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14407|14407]]).   * I don't know what's the origin of the failure. It wasn't an actuation overload due to an earthquake because there was no earthquake (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14407|14407]]).
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 * Making the 3D model of IMMT2 suspension.
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 * Summarizing the GUARDIANs.
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 * Ordered the parts for test and prepare for the test.
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  * JPS Meeting: 14-17 Sep. Online, Deadline: 4 Jun.   * JPS Meeting: 14-17 Sep. Online, Deadline: 4 Jun. (Takahashi, Shoda, Fabian)
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 * Report "KAGRA observation run: performance of the Type A suspensions" (Check the attached file in kagra-seis).

Agenda/Minutes of the VIS Meeting on 2020/5/22

2020/5/22 14:00 - 15:20

Zoom Meeting

Participants: Takahashi, Hirata, Fabian, Miyo, Sato, Shoda, Aso, Lucia, Tanaka

Task list towards O4

Schedule afetr O3

Progress report

General

Type-A

Type-B

  • After a verbal report from Lucia last week I checked the condition of SR2: the control system couldn't bring the IP to its set point (klog entry 14381).

    • On Monday Lucia and I came to the site.
    • We realized coil-magnet actuation didn't move the IP but horizontal fishing rods did, so we suspected the electronics or cabling.

    • With Yamamoto-kun we went to the tunnel and realized the HPCD had broken down (entry 14394).

    • Thanks to Tomura-san's quick reaction we got a new HPCD and recovered the IP and the suspension (entry 14395).

    • I don't know what's the origin of the failure. It wasn't an actuation overload due to an earthquake because there was no earthquake (entry 14407).

    • A similar event happened to the BS IP on the 5th of May (entry 14404).

  • I have been measuring decay times of the SR2 suspension on Thursday and Friday from the control room (klog entry 14413). There are no final results to show yet.

  • I asked a few elementary questions about inertial damping (questions here). Thank you very much Takahashi-san and Terrence for their answers! :D

Type-Bp

Type-C

  • Making the 3D model of IMMT2 suspension.

Controls

  • Summarizing the GUARDIANs.

Electronics

  • Ordered the parts for test and prepare for the test.

Post O3

  • KAGRA is in the suspended mode until 31st May.

  • Only measurements, which can be done remotely, are available (Request).

  • O3c is still under discussion between LVK (Plan, Sheet).

  • The site work towards O4 will be started from July at earliest.

Safety

Discussion

  • Submission to JPS/ASJ Meeting.
    • JPS Meeting: 14-17 Sep. Online, Deadline: 4 Jun. (Takahashi, Shoda, Fabian)
    • ASJ Meeting: 8-10 Sep. Online, Deadline: 9 Jun.
  • Report "KAGRA observation run: performance of the Type A suspensions" (Check the attached file in kagra-seis).

Travel Plans

Next meeting

  • On 2020/5/29(Fri)

KAGRA/Subgroups/VIS/VISMinutes20200522 (last edited 2020-05-22 15:58:44 by RyutaroTakahashi)