• KAGRA
• Subgroups
• DET
• Meeting

Meetings

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

20260415 (Wed.)

• Agenda
  • Announcement

    • Run plan (02/13) operation call (03/05) LIGO detchar (03/02)

    • Scheduled conference

      • LVK meeting: 2026/3/9-13 @Pisa Italy web 03/09 OPS session

      • JPS meeting: 2026/03/16-19 online

      • KIW14: 2026/05/15-16 @Perugia, Italy web

      • GWADW: 2026/05/17-23 @Elba web

    • KAGRA site report 03/25

    • Next meeting: middle of April (the meeting time might be changed)

      • 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

  • Collect opinions for the next KAGRA DetChar co-chair, including self-nominations or recommendations

  • Replacement of Pastaavi server was finished on 3/19

  • Update an environment for the online range-estimation code

  • 03/25 Failure of segment production on 3/21~2/22 UTC

    • The regular production of segment files at k1det1 has stopped between 3/21 UTC and 3/22 UTC. The time of stopping the segment production seems to be 2026-03-22 02:15:00 JST ~ 2026-03-22 02:30:00 JST. After that, the process to generate segment files restarted from 2026-03-22 14:45:00 JST.

    • git issue

    • KAGRA segment publishing was skipped for the March 21 date and manually run for March 22. Automatic publishing then got publishing caught up and is continuing on a daily basis.

20260325 (Wed.)

• Agenda
  • Prsentation by Kyujin

20260318 (Wed.)

• Agenda
  • Announcement

    • Run plan (02/13) operation call (03/05) LIGO detchar (03/02)

    • Scheduled conference

      • LVK meeting: 2026/3/9-13 @Pisa Italy web 03/09 OPS session

      • JPS meeting: 2026/03/16-19 online

      • KIW14: 2026/05/15-16 @Perugia, Italy web

      • GWADW: 2026/05/17-23 @Elba web

    • 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

      • 03/03 Trial of new DARM hierarchical control

      • 03/05 Recovery of digital system from the power outage

      • 03/09 LO for GRX PDH was out of order

      • Evaluation of effort for authorship 2025 is underway.
    • Next meeting: middle of April (the meeting time might be changed)

      • 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

  • Updates of makeCache script (YamaT)

  • Planned power outage at Kamioka

    • Shutdown of detchar computers located in the mine (Yuzurihara)

    • The detchar computers (k1det0, k1det1) came back online from the power outage. The regular production of the segment files at k1det1 restarted without issues.

  • O4a Calibrated Reconstruction Data Verification

  • Preparation for the upgrade of Pastavi server

    • The new Pastavi server was purchased with the SEO budget and delivered to the KAGRA site. I finished the initial setup on the server and confirmed that Pastavi works well. After that, I sent it to Kashiwa. I will replace the server in Kashiwa this Thursday.

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: 2026/05/15-16 @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: 2026/05/15-16 @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

• 2025

• 2024

• 2023

• 2022

• 2021

• 2020

• 2019