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| [[https://onedrive.live.com/view.aspx?resid=8E8081C20FE5EC3A!2278&ithint=file,xlsx&authkey=!AMFNtNa-Y6CVp94|Task list towards O4]] | [[https://www.dropbox.com/s/60oygtwmckmdyj6/Towards%20O4%20on%20VIS%20.xlsx?dl=0|Task list towards O4]] |
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| * 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 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14381|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 [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14394|14394]]). * Thanks to Tomura-san's quick reaction we got a new HPCD and recovered the IP and the suspension (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14395|14395]]). * 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]]). * A similar event happened to the BS IP on the 5th of May (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14404|14404]]). * I have been measuring decay times of the SR2 suspension on Thursday and Friday from the control room (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14413|14413]]). There are no final results to show yet. * I asked a few elementary questions about inertial damping (questions [[https://www.dropbox.com/s/g1q38sgbgocthbu/Inertial_damping_questions_fabian.pdf?dl=0|here]]). Thank you very much Takahashi-san and Terrence for their answers! :D |
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| * Making the 3D model of IMMT2 suspension. |
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| * The site work towards O4 will be started from July at earliest. | |
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| * JPS Meeting: 14-17 Sep. Online, Deadline: 4 Jun. * ASJ Meeting: 8-10 Sep. Online, Deadline: 9 Jun. |
Agenda/Minutes of the VIS Meeting on 2020/5/22
2020/5/22 14:00 -
Participants:
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 earthquke 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!
Type-Bp
Type-C
- Making the 3D model of IMMT2 suspension.
Controls
Electronics
Post O3
- KAGRA is in the suspended mode until 31st May.
Only measurements, which can be done remotely, are available (Request).
- 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.
- ASJ Meeting: 8-10 Sep. Online, Deadline: 9 Jun.
Travel Plans
Next meeting
- On 2020/5/29(Fri)