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Participants: Participants: Shinji Miyoki, Naoki Koyama, Osamu Miyakawa, Terrence Tak Lun Tsang, Yoichi Aso, Tatsuki Washimi, Chiaki Hirose, Takafumi Ushiba, Kenta Tanaka, Marc Eisenmann, Hirotaka Yuzurihara, Yuta Michimura
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 * Possibility of shortening Xarm and Yarm commissioning
  * We decided to show the shortened version of the schedule and task list, and ask for suggestions.
  * Shortened task list
   * POP investigation, REFL WFS and POP WFS consistency check, arm cavity alignment to check mid-size baffle positions
   * Other tasks are postponed to FPMI commissioning in-vac
  * Things to ask for suggestions
   * Target values for mode matching and laser power throughput
   * Whether if we should adjust PR2 and PR3 to improve the mode matching in air
 * Requirements for local damping
  * We need to check the status of coil drivers actually installed. For most of the suspensions, high power ones are currently used and this eases the requirement.
  * Nakano-kun said PRs are important for achieving the lock, but 7.3 um/sec requirement seems to be easily achievable. We need to check the current values.
  * For Type-A suspensions, <240 um/sec is the requirement for arm green locking, but there is another requirement coming from the central part locking. ITMs needs to be settled down to a level comparable to BS, SRs and PRs to lock recycling cavities (See text right below Table 5.1 in Sekiguchi thesis).
  * Let's set the requirement to be <0.44 um/sec for central part locking
 * What we want to ask the reviewers?
  * Send Michimura an email if you have some suggestions.
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 * Requirements for local damping summarized
  * ITMs and ETMs (Type-A): <240 um/sec, <0.1 urad RMS
  * BS (Type-B): <1.6 um/sec, <1 urad RMS
  * SRs (Type-B): <0.44 um/sec, <1 urad RMS
  * PRs (Type-Bp): <7.3 um/sec, <1 urad RMS
  * References:
   * K. Okutomi PhD thesis (Table 3.5) [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=9347|JGW-P1809347]]
   * T. Sekiguchi PhD thesis (Table 5.2) [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=4155|JGW-P1504155]]
   * Y. Michimura et al (Section 6) [[https://doi.org/10.1088/1361-6382/aa90e3|Classical and Quantum Gravity 34, 225001 (2017)]]
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  * Strategy for the arm cavity commissioning while the central area is open?
 * What do we want to ask to the reviewers?		   * Strategy for the arm cavity commissioning while the central area is open
   * Should we adjust the position of the PR2 and PR3 to improve the mode matching to the arms at Xarm/Yarm commissioning periods? Or after the center area is evacuated?
 * What we want to ask the reviewers?
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  * To be discussed at the IMC ASC weekly on Wednesday

ISC Meeting for ASC Strategies 2021/08/16 13:00 - 15:00

Participants: Shinji Miyoki, Naoki Koyama, Osamu Miyakawa, Terrence Tak Lun Tsang, Yoichi Aso, Tatsuki Washimi, Chiaki Hirose, Takafumi Ushiba, Kenta Tanaka, Marc Eisenmann, Hirotaka Yuzurihara, Yuta Michimura

Zoom meeting: https://zoom.us/j/5045179604

Your time zone: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20210816T0400

Next meeting

TBD

back to Meetings page

Minutes

  • Possibility of shortening Xarm and Yarm commissioning
    • We decided to show the shortened version of the schedule and task list, and ask for suggestions.
    • Shortened task list
      • POP investigation, REFL WFS and POP WFS consistency check, arm cavity alignment to check mid-size baffle positions
      • Other tasks are postponed to FPMI commissioning in-vac
    • Things to ask for suggestions
      • Target values for mode matching and laser power throughput
      • Whether if we should adjust PR2 and PR3 to improve the mode matching in air
  • Requirements for local damping
    • We need to check the status of coil drivers actually installed. For most of the suspensions, high power ones are currently used and this eases the requirement.
    • Nakano-kun said PRs are important for achieving the lock, but 7.3 um/sec requirement seems to be easily achievable. We need to check the current values.

    • For Type-A suspensions, <240 um/sec is the requirement for arm green locking, but there is another requirement coming from the central part locking. ITMs needs to be settled down to a level comparable to BS, SRs and PRs to lock recycling cavities (See text right below Table 5.1 in Sekiguchi thesis).

    • Let's set the requirement to be <0.44 um/sec for central part locking

  • What we want to ask the reviewers?
    • Send Michimura an email if you have some suggestions.

Agenda

KAGRA/subgroup/ifo/MIF/Minutes20210816 (last edited 2021-08-16 15:07:16 by YutaMichimura)