• KAGRA
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• DET
• Meeting

Meetings

• Meeting time: 11:00-11:30 JST/KST on every Wednesday
• Meeting room: Zoom3

20260318 (Wed.)

• Agenda
  • Announcement

    • Run plan (11/18) operation call (01/29) LIGO detchar (01/26)

    • Scheduled conference

      • LVK meeting: 2026/3/9-13 @Pisa Italy web, the deadline for poster registration is 8 Feb.

      • JPS meeting: 2026/03/16-19 online
      • KIW14: 2026/05/14-16 @Perugia, Italy
      • GWADW: 2026/05/17-23 @Elba

    • KAGRA site report 02/16

      • From April, the maintanance day at KAGRA site will be shifted from Friday to Monday.

      • 02/24 Installation of the new script server

      • 02/24 High bandwidth HARD/SOFT P DSOFT Y

      • 02/27 High-Bandwidth ARM ASC

    • Next meeting: 2026/03/18
  • Progress reports

    • Upgrade DetChar computers (YamaT)

    • DQR update (Yuzurihara)

    • lock loss study in the commissioning (YamaT, Yuzurihara) web

    • Update contents of summary page (Oshino)
    • Related to segment files (Uchikata, Narikawa)
    • pyCBC trigger list for O4a data (Narikawa and Uchikata)
    • provide the CAT1 veto-definer file for IPC glitch (Uchikata)
• Minutes
  • Commissioning

20260225 (Wed.)

• Agenda
  • Announcement

    • Run plan (11/18) operation call (01/29) LIGO detchar (01/26)

    • Scheduled conference

      • LVK meeting: 2026/3/9-13 @Pisa Italy web, the deadline for poster registration is 8 Feb.

      • JPS meeting: 2026/03/16-19 online
      • KIW14: 2026/05/14-16 @Perugia, Italy
      • GWADW: 2026/05/17-23 @Elba

    • KAGRA site report 02/16

      • From April, the maintanance day at KAGRA site will be shifted from Friday to Monday.

      • 01/29 PRX and PRY power recycling measurements

      • 01/29 First trial of high-bandwidth ASC: DHARD pitch

      • 01/30 upgrade of k1gate

      • 01/31 Second trial of high-bandwidth ASC: {D, C}HARD pitch

      • 02/02 Third trial of high-bandwidth ASC: DHARD pitch

      • 02/04 Xarm and Yarm round-trip loss measurements using POP and POS

      • 02/05 Decoupling {D, C}SOFT from HARD in Pitch

      • 02/05 Continuation of high-bandwidth ASC work: CHARD_P / DHARD_P

      • 02/05 Finesse reanalysis

      • 02/06 First trial of high bandwidth control of DHARD Yaw

      • 02/08 Mysterious GRX behavior 260208 morning

      • 02/16 Binary range decreasing

      • 02/17 Update of camera_client script

      • 02/18 Local control noise coupling is reduced after warming up

    • Next meeting: 2026/03/18
  • Progress reports

    • Upgrade DetChar computers (YamaT)

    • DQR update (Yuzurihara)

    • lock loss study in the commissioning (YamaT, Yuzurihara) web

    • Update contents of summary page (Oshino)
    • Related to segment files (Uchikata, Narikawa)
    • pyCBC trigger list for O4a data (Narikawa and Uchikata)
    • provide the CAT1 veto-definer file for IPC glitch (Uchikata)
• Minutes
  • Commissioning

    • https://klog.icrr.u-tokyo.ac.jp/osl/?r=36300

  • The updated segment file for O4a and O4c are prepared. (Uchikata)

    • klog

    • Yuzurihara performed the review as a cross check of the prepared segment files.
  • Upgrade of Pastavi server (Yuzurihara)
    • New server was delibered to KAGRA site. The initial setting for the server is underway. The Pastavi server at Kashiwa will be replaced on middle of March.

20260204 (Wed.)

• cancel

20260128 (Wed.)

• Agenda
  • Announcement

    • Run plan (11/18) operation call (01/22) LIGO detchar (01/26)

    • Scheduled conference

      • LVK meeting: 2026/3/9-13 @Pisa Italy web, the deadline for poster registration is 8 Feb.

      • JPS meeting: 2026/03/16-19 online
      • KIW14: 2026/05/14-16 @Perugia, Italy
      • GWADW: 2026/05/17-23 @Elba

    • KAGRA site report 01/14

      • 01/23 Optimization of CMS boards to suppress residual frequency noise

      • 01/24 Status of the increasing laser power

      • 01/25 Laser power up test and Follow-up Issues

      • 01/27 Recovery of DC readout with 5 W input

      • 01/27 Calibration after IFO recovery

      • 01/27 Tuning of feedforward gain

      • 01/27 Interferometer loss investigations

      • 01/27 DARM sensitivity improvement around 10 Hz

      • 01/28 Trial of 10-W DC readout

      • 01/28 Calibration after IFO recovery

    • Next meeting: 2026/02/04, 2/25
  • Progress reports

    • Upgrade DetChar computers (YamaT)

    • DQR update (Yuzurihara)

    • lock loss study in the commissioning (YamaT, Yuzurihara) web

    • Update contents of summary page (Oshino)
    • Related to segment files (Uchikata, Narikawa)
    • pyCBC trigger list for O4a data (Narikawa and Uchikata)
    • provide the CAT1 veto-definer file for IPC glitch (Uchikata)
• Minutes
  • Commissioning

    • lockloss investigation (2026/01/20)

  • Method to identify scattered light noise
    • Chia-Jui Chou will give a presentation about the algorithm to identify the scattered light noise.
  • The review of the updated segment file for O4a and O4c is necessary.
    • The segment files were prepared by Uchikata-san and stored in kmst-2. Yuzurihara plan to review them.

20260114 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:
      • O4 observing run ended at 1:00 JST 11/19. Thank you for many contributions!

      • Run plan (11/18) operation call (01/08) LIGO detchar (01/12)

    • Scheduled conference

      • JGRG34: 2026/01/19~23 @Kyoto university web

      • LVK meeting: 2026/3/9-13 @Pisa Italy

    • KAGRA site report 12/22

      • 12/24 Strange behaviour of TMSX IR and GR PDs

      • 12/25 ITMY frosting detected in TCam

      • 12/26 CARM noise budget in Nov. 2025

      • 01/08 Preparation of finesse analysis GUI

      • 01/10 O4a Calibrated Reconstruction Data Verification

    • Next meeting: 2026/01/28
  • Progress reports

    • Upgrade DetChar computers (YamaT)

    • DQR update (Yuzurihara)

    • lock loss study in the commissioning (YamaT, Yuzurihara) web

    • Update contents of summary page (Oshino)
    • Related to segment files (Uchikata, Narikawa)
    • pyCBC trigger list for O4a data (Narikawa and Uchikata)
    • provide the CAT1 veto-definer file for IPC glitch (Uchikata)
• Minutes
  • Commissioning

  • Upload of Segment files to DQSEGDB git issue

  • Upgrade of Pastavi server (Yuzurihara)
    • New server will be delibered to KAGRA site next week. After the initial setting, the Pastavi server at Kashiwa will be replaced. (CPU 10 cores, memory 256 GB)

Past meeting

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• 2021

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• 2019