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2020/5/29 14:00 -  2020/5/29 14:00 -
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Participants: Participants: Takahashi, Fabian, Sato, Hirata, Shoda, Miyo, Tanaka, Aso, Lucia, Washimi
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 * As reported by Yamamoto-san ( see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14432) F1 GAS output was satured. So Yesterday I offloaded the GAS output by changing the offset on F1 and F2 (see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14434)
 * I took advantage of the suspended mode of KAGRA to investigate some strange response of the geophone installed on the Type A suspension. The test has been done with EX geophone. Basically, I changed the cutoff of the calibration filter from 10 mHz to 3 mHz and I measured the TF= GEO/(LVDT*w). By moving back to 3 mHz the DC cutoff the phase shift is reduced a lot, but the DC noise is growing up. I turned on the ID with blending at 140 mHz: the loop is stable, but the 148 mHz peack got excited (see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14443).
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 * I worked in the measurements of the decay times of SR2. I still have to analyze data. No results to show yet.
 * Washimi-san reported the feedback signal in SRM F0 was too high. I offloaded onto the fishing rod this morning (klog entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=14436|14436]]). According to the [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/OpsManual/FishingRods|VIS wilki fishing rod page]], this fishing rod does not suffer of any known problems.
 * I will postpone asking questions about inertial damping again for next week.
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 * 3D CAD model of the present IMMT2 suspension is completed.
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 * Working on the Type-A situation reproduction, which was assigned at cryo-payload upgrade review. (Shoda)
 * Comparing the IP performance from the design.
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 * Test parts have been delivered.
 * The experiment will start from the week after next week.
 * Test of the LVDT card modification on the grounding is planed.
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 * More activities in the control room and the site will be available from June 1st (Noise budget by Ushiba).   * More activities in the control room and the site will be available from June 1st (Noise budget by Ushiba).
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 * Post Obs. task ([[https://docs.google.com/spreadsheets/d/1w4q8OvX9E6nkYSgshLYLoZH5yvQXHvGmL1agux8ztx0/edit?usp=sharing|Request]]), Task for O3c ([[https://paper.dropbox.com/doc/Plan-for-the-long-OR-brake--AxxlJFvK1IGJjqrG5nfdHfGXAQ-KqexeqMaCA7DITFGxA5ih|Plan]], [[https://www.dropbox.com/s/hoadb73fdyah02c/Post-O3%20task.xlsx?dl=0|Sheet]]).
Post Obs. task ([[https://docs.google.com/spreadsheets/d/1w4q8OvX9E6nkYSgshLYLoZH5yvQXHvGmL1agux8ztx0/edit?usp=sharing|Request]]), Task for O3c ([[https://paper.dropbox.com/doc/Plan-for-the-long-OR-brake--AxxlJFvK1IGJjqrG5nfdHfGXAQ-KqexeqMaCA7DITFGxA5ih|Plan]], [[https://www.dropbox.com/s/hoadb73fdyah02c/Post-O3%20task.xlsx?dl=0|Sheet]]).
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 * Papers
  * Mechanics of Type-A tower + Cryo-payload: Shoda (on going)
  * Performance of Type-A: Lucia
  * Control of Type-A: Lucia?
  * Control (Sensor correction): Fujii
  * Type-B: Fabian (on going)

 * Personnel towards O4
  * Takahashi supervises both teams.
  * Type-A team: Sato, Miyo, Takahashi, company person
  * Type-B/Bp team: Shoda(supervisor), Hirata, Fabian, Terrence, Washimi, company person

Agenda/Minutes of the VIS Meeting on 2020/5/29

2020/5/29 14:00 -

Zoom Meeting

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

Task list towards O4

Schedule towards O4

Progress report

General

Type-A

  • As reported by Yamamoto-san ( see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14432) F1 GAS output was satured. So Yesterday I offloaded the GAS output by changing the offset on F1 and F2 (see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14434)

  • I took advantage of the suspended mode of KAGRA to investigate some strange response of the geophone installed on the Type A suspension. The test has been done with EX geophone. Basically, I changed the cutoff of the calibration filter from 10 mHz to 3 mHz and I measured the TF= GEO/(LVDT*w). By moving back to 3 mHz the DC cutoff the phase shift is reduced a lot, but the DC noise is growing up. I turned on the ID with blending at 140 mHz: the loop is stable, but the 148 mHz peack got excited (see klog http://klog.icrr.u-tokyo.ac.jp/osl/?r=14443).

Type-B

  • I worked in the measurements of the decay times of SR2. I still have to analyze data. No results to show yet.

  • Washimi-san reported the feedback signal in SRM F0 was too high. I offloaded onto the fishing rod this morning (klog entry 14436). According to the VIS wilki fishing rod page, this fishing rod does not suffer of any known problems.

  • I will postpone asking questions about inertial damping again for next week.

Type-Bp

Type-C

  • 3D CAD model of the present IMMT2 suspension is completed.

Controls

  • Working on the Type-A situation reproduction, which was assigned at cryo-payload upgrade review. (Shoda)
  • Comparing the IP performance from the design.

Electronics

  • Test parts have been delivered.
  • The experiment will start from the week after next week.
  • Test of the LVDT card modification on the grounding is planed.

Post O3

  • KAGRA is still in the suspended mode. Only remote measurements are available until May 31st (Q-measurement by Fabian, Type-A measurement by Lucia).
  • More activities in the control room and the site will be available from June 1st (Noise budget by Ushiba).
  • Decision for O3c in Virgo will be done within two weeks (from EO). If O3c was decided, task for O3c will be available as well (e.g. Sensor correction for SRs).
  • Post Obs. task has priority higher than task for O3c. Two weeks, at least, in June will be assigned for Post Obs. task.
  • The site work towards O4 will be rescheduled.

Post Obs. task (Request), Task for O3c (Plan, Sheet).

Safety

Discussion

  • Papers
    • Mechanics of Type-A tower + Cryo-payload: Shoda (on going)
    • Performance of Type-A: Lucia
    • Control of Type-A: Lucia?
    • Control (Sensor correction): Fujii
    • Type-B: Fabian (on going)
  • Personnel towards O4
    • Takahashi supervises both teams.
    • Type-A team: Sato, Miyo, Takahashi, company person
    • Type-B/Bp team: Shoda(supervisor), Hirata, Fabian, Terrence, Washimi, company person

Travel Plans

Next meeting

  • On 2020/6/5(Fri)

KAGRA/Subgroups/VIS/VISMinutes20200529 (last edited 2020-05-29 15:43:10 by RyutaroTakahashi)