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Participants: Participants: Kenta Tanaka, Shinji Miyoki, Haoyu Wang, Eleonora Caposaca, Kiwamu Izumi, Koji Nagano, Masayuki Nakano, Matteo Leonardi, Osamu Miyakawa, Ryutaro Takahashi, Kentaro Somiya, Tomotada Akutsu, Yoichi Aso, Yuta Michimura
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Time: https://www.timeanddate.com/worldclock/meetingdetails.html?year=2020&month=7&day=6&hour=4&min=30&sec=0&p1=248&p2=237&p3=4399&p4=137 Your time zone: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20200706T0430
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When necessary When necessary (New meeting slot: bi-weekly Mondays, from 13:00 JST)
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 * Video record of the meeting: [[JGW-T2011793|https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11793]]
 * Summary of current measurements so far
  * LSC sensing matrix, measurements vs simulation
   * The parameter choice of "BRSE_SDMR1_17_45" is OK for the Optickle simulation.
    * SDMR1 means single demodulation, using REFL_1I for CARM.
   * POP17Q (MICH error signal) seems to have too much DARM contribution.
    * Although DARM displacement is much smaller than MICH displacement and may be negligible, MICH feedforword would spoil DARM if DARM to MICH coupling is too large
    * DARM excitation was done by injecting signal at DARM error point, when DARM was fed back to both ETMs
   * '''A/I''': Sensing matrix re-measurement with
    * Correct CARM calibration
    * Feedforword off (probably already done with FF off, but need to double check)
    * Measurement for both I-phase and Q-phase
  * Schnupp asymmetry
   * Result from time of flight measurement (3.36(1) m, [[klog #14575|https://klog.icrr.u-tokyo.ac.jp/osl/?r=14575]]) and that from laser frequency modulation measurement (0.56 m [[klog #14541|https://klog.icrr.u-tokyo.ac.jp/osl/?r=14541]]) are inconsistent
    * There might be an error in BS calibration, laser frequency calibration and/or calculations
     * ETM calibration starting from free-swinging Michelson and Pcal ETM calibration seems to be consistent
     * Laser frequency calibration using ALS AOM and Pcal ETM calibration seems to be consistent
     * Calculations are confirmed independently by Keiko and Masayuki
    * '''A/I''' Check the calculations again
  * PRC length measurements
   * Time of flight measurement would be possible if you use AS beam
   * '''A/I''' PRY length measurement to be done once IFO is recovered
  * OMC scan to see mode content of AS beam
   * Carrier and f1 HOM3 mode seems to be overlapped [[klog #14691 omcmodes.pdf|https://klog.icrr.u-tokyo.ac.jp/osl/uploads/14691_20200705054303_omcmodes.pdf]]

 * New ISC member
  * Kenta Tanaka (ICRR) -> added to kagra-isc mailing list
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   * PRX length: about 68 m https://klog.icrr.u-tokyo.ac.jp/osl/?r=14633    * PRX length: about 68 m (designed: 68.2559 m) https://klog.icrr.u-tokyo.ac.jp/osl/?r=14633
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   * carrier and f1 3rd mode is overlapped?    * carrier and f1 3rd mode is overlapped? http://klog.icrr.u-tokyo.ac.jp/osl/?r=14620
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   * https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11792
 * New ISC meeting slot?
  * Bi-weekly SEO and Chief meeting on Modays, from 15:00 JST
  * How about bi-weekly Mondays 13:00 JST (before chief meetings)

ISC Meeting on 2020/07/06 13:30 - 14:30

Participants: Kenta Tanaka, Shinji Miyoki, Haoyu Wang, Eleonora Caposaca, Kiwamu Izumi, Koji Nagano, Masayuki Nakano, Matteo Leonardi, Osamu Miyakawa, Ryutaro Takahashi, Kentaro Somiya, Tomotada Akutsu, Yoichi Aso, Yuta Michimura

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

Your time zone: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20200706T0430

Next meeting

When necessary (New meeting slot: bi-weekly Mondays, from 13:00 JST)

back to Meetings page

Minutes

  • Video record of the meeting: https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11793

  • Summary of current measurements so far
    • LSC sensing matrix, measurements vs simulation
      • The parameter choice of "BRSE_SDMR1_17_45" is OK for the Optickle simulation.
        • SDMR1 means single demodulation, using REFL_1I for CARM.
      • POP17Q (MICH error signal) seems to have too much DARM contribution.
        • Although DARM displacement is much smaller than MICH displacement and may be negligible, MICH feedforword would spoil DARM if DARM to MICH coupling is too large
        • DARM excitation was done by injecting signal at DARM error point, when DARM was fed back to both ETMs

      • A/I: Sensing matrix re-measurement with

        • Correct CARM calibration
        • Feedforword off (probably already done with FF off, but need to double check)
        • Measurement for both I-phase and Q-phase
    • Schnupp asymmetry

      • Result from time of flight measurement (3.36(1) m, https://klog.icrr.u-tokyo.ac.jp/osl/?r=14575) and that from laser frequency modulation measurement (0.56 m https://klog.icrr.u-tokyo.ac.jp/osl/?r=14541) are inconsistent

        • There might be an error in BS calibration, laser frequency calibration and/or calculations
          • ETM calibration starting from free-swinging Michelson and Pcal ETM calibration seems to be consistent
          • Laser frequency calibration using ALS AOM and Pcal ETM calibration seems to be consistent
          • Calculations are confirmed independently by Keiko and Masayuki

        • A/I Check the calculations again

    • PRC length measurements
      • Time of flight measurement would be possible if you use AS beam

      • A/I PRY length measurement to be done once IFO is recovered

    • OMC scan to see mode content of AS beam
  • New ISC member

    • Kenta Tanaka (ICRR) -> added to kagra-isc mailing list

Agenda

Copy from previous meeting

  • Simulation activities necessary
    • LSC and ASC simulations with current ITMs and current interferometer setup
      • Especially LSC simulations not done for PRFPMI and DRMI, and 3f locking
      • Compare measured LSC and ASC sensing matrices with simulations
      • Compare measured recycling gain (for carrier and sidebands) with simulations
      • Compare measured AS mode content with simulations
      • Compare measured MICH/PRCL/SRCL controls noise coupling with simulations
      • Compare measured intensity/frequency noise coupling with simulations
    • Thermal lensing in BS
  • Measurements necessary to do simulation work
    • PRC (SRC) length and Gouy phase
    • Schnupp asymmetry
    • modulation depth (arm cavity scan)
    • arm cavity length (arm cavity scan)

    • arm cavity round-trip loss measurement with birefringence effect correctly taken into account (with PBS at POP/POS and TRX/TRY) JGW-T2011633

    • Power recycling gain for carrier and sidebands
    • Throughput from IMC output to AS RF, OMC DC, REFL, POP, TRX, TRY
  • Measurements necessary to compare the result with simulation

KAGRA/subgroup/ifo/MIF/Minutes20200706 (last edited 2020-07-06 16:26:33 by YutaMichimura)