• KAGRA
• Subgroups
• DET
• Meeting

Meetings

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

---

20250611 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(05/15 updated) operation (05/15) LIGO detchar (5/12)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there is a potential at the start of the run for slightly elevated false alarm rates as search backgrounds accumulate
    • Scheduled conference

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 05/23

      • 5/28 Changing reference of ITM's BPC from IX to IY

      • 5/30 ITM height adjustment

      • Long-term drift of Y arm alignment

    • Next meeting: 2025/06/25
  • 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: 2025/05/28~05/29 klog

    • Blasting of Tunnel construction unlocked IFO klog

    • lockloss investigation: 2025/05/29~06/01 klog

    • Transient noise in sensitivity and PRCL klog

  • Line information

    • Peak list on DARM in the last weekend data klog

  • Summary page

    • IFO guardians klog

    • CAL guardians klog

    • Removed PDB channels from the ISS tab klog

    • LSC_LOCK guardian klog

  • Segment production

    • Update of ETMX saturation bit in the online DQSV (k1detdq0) klog

    • Update of segment production to include the checker channels of DAC overflow of ETMX with LPCD klog

  • IPC glitch

    • Proposal about data reduction to mitigate IPC glitches klog

---

20250528 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(05/15 updated) operation (05/15) LIGO detchar (5/12)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there is a potential at the start of the run for slightly elevated false alarm rates as search backgrounds accumulate
    • Scheduled conference

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 05/23

      • 5/22 the interferometer can reach PRFPMI DC lock with 10W after the ITMX release by warming up

      • IFO alignment tweaking in May 26, 2025

      • Changing reference of ITM's BPC from IX to IY

    • X.509 authentification certificate issuance ended on May 20. Please switch SciTokens wikiinstruction

    • Next meeting: 2025/06/11 (the meeting on 6/4 will be canceled due to the preparation of O4c run)
  • 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: 2025/05/23~05/25 klog

  • Toward the observing run

    • Update of IFO guardian to check calibration status klog

    • CAL_PROC guardian was resumed klog

    • Checker scripts for showing deviations from science-mode configuration klog

    • snapshot management is taken over from VIS guardians to LSC_LOCK guardian klog

    • Post-Response of Working with Observation JGWdoc

    • Definition of the science flag JGWdoc

    • Checked RFPD channels in the configuration files of Omicron, Hveto, and Omegascan klog

    • Modified plotting range of strain on SummaryPages klog

  • CAT1 preparation for O4a data

    • Update of the segment lists at kmst2 klog

    • The regenerated segment files are reviewed by Yuzurihara and Alvin.

---

20250521 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(05/15 updated) operation (05/15) LIGO detchar (5/12)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there is a potential at the start of the run for slightly elevated false alarm rates as search backgrounds accumulate
    • Scheduled conference

      • KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 05/02

      • 5/8 ITMX suspension trouble

      • 5/19 Stop cryocooler for ITMX payload

      • 5/21 Morning ITMX check

    • X.509 authentification certificate issuance ended on May 20. Please switch SciTokens wikiinstruction

    • Next meeting: 2025/05/28
  • 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

    • Summary of recent segment for IPC glitch (2025/04/01~05/08) klog

  • scattered light noise

    • Report of recent scattered light noise in MICH: 2025/05/06 klog

    • Presentation slide for KIW web

  • Hveto Paper is ready for submission (Kihyun)
  • Presentation of O4a glitch classification by Yi Yang. The slide will be uploaded in JGWdoc.

---

20250514 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(03/15 updated) operation (05/08) LIGO detchar (5/12)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there may be an engineering period of around a week at the beginning of the run
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

        • deadline for registration: 2025/04/30

      • JGWC(Japan Gravitational Wave Community) workshop: 2025/05/09(Fri)~10(Sat)@ JAXA Sagamihara web

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 05/02

      • Blasting of Tunnel construction unlocked IFO

      • Finding better beam spot and achieving the best sensitivity around 100 Hz

      • Trial of the adding the material on the beam duct between IFI and IMM

      • Increasing PRCL control UGF

      • Inspection by turning off some equipments

    • Maintenance of Kashiw cluster (system-B) was done on April 18.
      • The purpose is for several software updates and for the update of condor setting to reserve CPUs for high-priority jobs.

    • Retirement of X.509 authentification on May 20. Please switch SciTokens wikiinstruction

    • Next meeting: 2025/05/21
  • 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 guardian stopped by NDS connection error klog

    • Lock loss study during Japanese Golden week (GW) klog

    • Installation of tertiary NDS klog

  • cache and segment reproduction at Kashiwa cluster klog

  • Scattered light noise

    • A report of recent scattered light noise in MICH: 2025/04/13, 29

    • presentation (for ASROC) by Shih-Hong Hsu
  • Hveto Paper by Kihyun is under review.
  • Summary page (Oshino)
    • plan to change the order of tab
  • Omicron and Hveto (Oshino)
    • plan to confirm the configuration files of Omicron and Hveto, especially channel related to RFPD
  • Line Monitor (Takahiro S Yamamoto)
    • Fixing issues with the Line Monitor is underway.

---

20250430 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(03/15 updated) operation (04/03) LIGO detchar (4/7)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there may be an engineering period of around a week at the beginning of the run
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference

      • From Quarks to Neutron Stars: Insights from kHz gravitational waves: 2025/04/23-24 @Hongo Campus, The University of Tokyo web

      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

        • deadline for registration: 2025/04/30

      • JGWC(Japan Gravitational Wave Community) workshop: 2025/05/09(Fri)~10(Sat)@ JAXA Sagamihara web

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 04/18

      • Revisiting BPC tuning

      • Silent run (2025/04/26~27) and longest lock ~22 hours

      • Blasting of Tunnel construction unlocked IFO

    • Maintenance of Kashiw cluster (system-B) was done on April 18.
      • The purpose is for several software updates and for the update of condor setting to reserve CPUs for high-priority jobs.

    • Retirement of X.509 authentification on May 20. Please switch SciTokens wikiinstruction

    • Next meeting: 2025/05/14
      • plan to give short presentation by Shi-Hong
  • 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

    • Comparison of number of IMCL labels between 1.2 W and 10 W operation klog

    • The recent interferometer is sensitive to the weak seismic motion or not klog

    • Histogram of phenomena before lockloss (2025/02/10~04/21) klog

    • lockloss investigation: 2025/04/21~04/27 klog

  • veto definer file
    • The CAL group decided to generate the strain data of O4a KAGRA data by applying the high-pass filter (FIR) and correcting the time-delay shift. Now it's underway.
    • Originally, we planned to exclude the 1 second, including the IPC glitch, from the analysis. The additional FIR filter widens the time affected by the IPC glitch. We changed the plan to exclude 7 seconds (3+1+3 seconds) from the analysis.
    • After excluding the segment including the IPC glitch, we also exclude the science mode of less than 64 seconds.

    • The preparation of the veto definer file is underway. The procedure and other helpful links are summarized in wiki by Uchikata-san.

  • Pastavi

    • Pastavi update: removed less-used options klog

  • noise subtratcion

    • Noise Subtraction at 116 Hz on April 24 klog

---

20250423 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(03/15 updated) operation (04/03) LIGO detchar (4/7)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there may be an engineering period of around a week at the beginning of the run
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference

      • From Quarks to Neutron Stars: Insights from kHz gravitational waves: 2025/04/23-24 @Hongo Campus, The University of Tokyo web

      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

        • deadline for registration: 2025/04/30

      • JGWC(Japan Gravitational Wave Community) workshop: 2025/05/09(Fri)~10(Sat)@ JAXA Sagamihara web

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 04/18 SEO report(4/1)

      • Re-tuning of INP2 pitch and PRC2 pitch

    • Maintenance of Kashiw cluster (system-B) was done on April 18.
      • The purpose is for several software updates and for the update of condor setting to reserve CPUs for high-priority jobs.

    • Retirement of X.509 authentification web. Instead, please use SciTokens. web

    • Next meeting: 2025/04/30
  • 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

    • Investiagation of large glitch around 23:39:55 klog

    • lockloss investigation: 2025/04/14~04/21 klog

  • veto definer file
    • The CAL group decided to generate the strain data of O4a KAGRA data by applying the high-pass filter (FIR) and correcting the time-delay shift. Now it's underway.
    • Originally, we planned to exclude the 1 second, including the IPC glitch, from the analysis. The additional FIR filter widens the time affected by the IPC glitch. We changed the plan to exclude 7 seconds (3+1+3 seconds) from the analysis.
    • After excluding the segment including the IPC glitch, we also exclude the science mode of less than 64 seconds.

    • The preparation of the veto definer file is underway. The procedure and other helpful links are summarized in wiki by Uchikata-san.

---

20250416 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(03/15 updated) operation (04/03) LIGO detchar (4/7)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there may be an engineering period of around a week at the beginning of the run
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference

      • From Quarks to Neutron Stars: Insights from kHz gravitational waves: 2025/04/23-24 @Hongo Campus, The University of Tokyo web

      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

        • deadline for registration: 2025/04/30

      • JGWC(Japan Gravitational Wave Community) workshop: 2025/05/09(Fri)~10(Sat)@ JAXA Sagamihara web

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 04/03 SEO report(4/1)

      • improvement of peaks around 20 Hz and their tails klog

    • Condor setting at Kashiwa cluster (system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs
    • Maintenance of Kashiw cluster (system-B) for several software update is planed.
    • Next meeting: 2025/04/23
  • 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

    • Expected improvement of inspiral range by mitigating of bump or line noise (2025/04/06) klog

    • Large breathing of PRCL and DARM klog

    • lockloss investigation klog

  • Summary page (Oshino)

    • Modified plotting range on SummaryPages klog

  • Gauch

    • Gauch update: added feature to display images lazy klog

  • Pastavi

    • Issue on cache file production on Pastavi server klog

  • veto definer file
    • Thre preparaion is ongoing. Derek and LIGO detchar team helped a lot.
    • X.509 will be retired in May.
  • Annoucement from open data

    • study hub is planed at National taiwan university in middle June

    • paper preparation LIGO DCC

---

20250409 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(03/15 updated) operation (04/03) LIGO detchar (4/7)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there may be an engineering period of around a week at the beginning of the run
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference

      • From Quarks to Neutron Stars: Insights from kHz gravitational waves: 2025/04/23-24 @Hongo Campus, The University of Tokyo web

      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

        • deadline for registration: 2025/04/30

      • JGWC(Japan Gravitational Wave Community) workshop: 2025/05/09(Fri)~10(Sat)@ JAXA Sagamihara web

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 04/03 SEO report(4/1)

      • improvement of peaks around 20 Hz and their tails klog

    • Condor setting at Kashiwa cluster (system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs
    • Maintenance of Kashiw cluster (system-B) for several software update is planed.
    • Next meeting: 2025/04/16
  • 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

    • Summary of recent segment for IPC glitch (2025/03~04/03) klog

    • How far can KAGRA observe BBHs with the current sensitivity? klog

    • lockloss investigation: 2025/04/04~04/07 klog

    • BPC issue and unknown excess in 500~2000Hz klog
  • Summary page

    • Modified plotting range on SummaryPages klog

    • Omicron stopped at 4/2 klog

    • Modified plotting range of OMC transmit power graph in SummaryPages klog

    • Adde new guardian state to guardian plots of SummaryPages klog

    • Added new tabs in SummaryPages (Working/Silent run/Locked (RF)) klog

    • modified plotting range of PSL table temperature and PSL QPD klog

  • Scattered light noise

    • No scattered light noise and transient noise in PRCL feedback of 4/2 and 4/3 klog

  • Denoising beam jitter noise at 127 Hz using DeepClean (Shu-Wei Yeh, Chia-Jui Chou) klog

---

20250402 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(03/15 updated) operation (03/20)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC; there may be an engineering period of around a week at the beginning of the run
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference

      • (done) LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia web slide

      • From Quarks to Neutron Stars: Insights from kHz gravitational waves: 2025/04/23-24 @Hongo Campus, The University of Tokyo web

      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • (new) KIW12: 2025/05/26~27 @Shanghai Astronomical Observatory, Chinese Academy of Sciences web

        • deadline for registration: 2025/04/30

      • (new) JGWC(Japan Gravitational Wave Community) workshop: 2025/05/09(Fri)~10(Sat)@ JAXA Sagamihara web

        • deadline for registration: 2025/04/07

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 03/17

      • Current noise budget slide

      • Evaluation of the frequency and the amplitude for 40-Hz resonance forest klog

    • Condor setting at Kashiwa cluster (system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs
    • Maintenance of Kashiw cluster (system-B) for several software update is planed.
    • Next meeting: 2025/04/09
  • 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

    • new label to tag the lockloss identify to the oscillation of IMC length control klog

      • (YamaT) is the cause of the oscillation readly IMC length? not IMC pitch?

    • hang up of LOCKLOSS guardian due to bad treatment of string by ezca klog

    • lockloss investigation: 2025/03/19 UTC klog

    • lockloss investigation: 2025/03/18~3/20 klog

  • Summary page

    • Range estimation on SummaryPages klog klog

  • Scattered light noise

    • Relation between seismic motion and scattered light noise in PRCL: 2025/02/11 - 02/22 klog

  • Power outage at Kashiwa
    • Power outage at Kashiwa at 08:14 on 03/17; system-B was shutdown and recovered at 11:30. (See Kanda-san's mails)
  • veto definer (CAT1)
    • we will work with LV team.

    • (YamaT) What is the latency to provide the veto definer? --> a few month delay.

  • Bruco

    • Swapping of test and production servers for k1det2 klog

  • Segment production at Kamioka (Yuzu)

    • Restart the segment production klog

  • Segment production at Kashiwa (Uchikata)

    • The cache file and segment files were reproduced at Kashiwa cluster, except for 2/7. At that time, the channel name to identify the overflow was changed due to the model update. klog That's the cause of the failure of the reprocudtion.

  • Denoising beam jitter noise at 127 Hz using DeepClean (Shu-Wei Yeh)

    • (Yuzu) Is there the regular meeting of the noise subtraction? --> not yet

    • (Yuzu) What is the type of the band pass filter? --> butterworth 8-order, which is implemented in deepclean

    • (Yuzu) What is the update from previous analysis? --> They changed the different time and added the new channel in the analysis

    • (Yuzu) In addition to the ASD ratio, it's better to check the improvement of the inspiral range.
    • (Yokozawa) If you change the frequency band, the results will be changed?

    • (YamaT) deepclean can subtract both the linear and non-linear coupling. In this analysis, which both couplings were renoved? --> now only linear coupling

  • Presentation on the glitch investigation for O3GK data (Oshino)

---

20250319 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(02/15 updated) operation (02/27)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference

      • From Quarks to Neutron Stars: Insights from kHz gravitational waves: 2025/04/23-24 @Hongo Campus, The University of Tokyo web

      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 02/25

    • Condor setting at Kashiwa cluster (called system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs

    • FY2025 Budget Plan --> The request was done.

    • Power outage at Kashiwa at 08:14 on 03/17; system-B was shutdown and recovered at 11:30. (See Kanda-san's mails)
    • Next meeting: 2025/04/02 (next week, LVK meeting is overlapped)
  • 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

    • Trial of damping around 40 Hz klog

    • Kick of the violin mode when PRFPMI_RF_LOCKED klog klog

    • ETMY is likely kicked frequenctly klog

    • Noise budget of the best sensitivity on Mar. 3rd klog

    • Tuning some offsets klog

      • The stable lock during 7 hours was archived.
  • Power outage at Kashiwa

    • Restart k1nds2 klog

    • May I ask the recovery the cache file and segment production after the data transfer was done?
    • Segment production was stopped since 2/8?
  • Summary page

    • Work on SummaryPages klog

---

20250312 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(02/15 updated) operation (02/27)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/31(extended).
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report
    • Condor setting at Kashiwa cluster (called system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs
    • FY2025 Budget Plan
    • Next meeting: 2025/03/12
  • 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: 2025/03/05 UTC klog

  • Omicron

    • Omicron stopped from 3/4 klog

    • Scattered light glitch at Yend klog

---

20250305 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(02/15 updated) operation (02/27)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/31(extended).
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report
      • Milestone

        • 2/20 Implementation of the automatic 10 W PRFPMI DC opration by modifiing OMC LSC lock acquisition with the OMC LOCK guardian klog

    • Condor setting at Kashiwa cluster (called system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs
    • FY2025 Budget Plan
    • Next meeting: 2025/03/12
  • 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

    • hang up of LOCKLOSS guardian due to user code errors in LSC_LOCK klog

    • Expected improvement of inspiral range by mitigating of bump or line noise klog

    • Lock duration statistics in January and February 2025 klog

    • lockloss investigation: 2025/02/19-23 (only 10W operation) klog

  • scattered light noise

    • Noise characters in PRCL control of 2025/02/22-23 klog slide

---

20250226 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(02/15 updated) operation (02/20)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/31(extended).
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 02/13

      • Milestone

        • 2/19 PRFPMI DC lock with 10W input power was succeeded manually klog

        • 2/20 Implementation of the automatic 10 W PRFPMI DC opration by modifiing OMC LSC lock acquisition with the OMC LOCK guardian klog

    • Condor setting at Kashiwa cluster (called system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs

    • Initial effort submission for KAGRA authorship 2025 started. The submission deadline is Friday February 21 (2025) 17:00 (JST). wiki

    • Next meeting: 2025/03/05
  • 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

    • Sensitivity improvement by turning off the OMC ASC beacon klog

    • Gauch update: overview page of the Gauch klog

    • lockloss investigation: 2025/02/17-19 klog

    • lockloss investigation: 2025/02/10-12 slide

  • Segment

    • Now several segments are available on DQSEGDB at Feb 21. git repo

    • Fixed issue of unexpected suspend of regular segment. klog

  • veto definer file wiki

    • The question about "what is the necessary minimum duration for search pipeline?" was posted to DAC WG chairs
      • X-pipeline: 64 s
      • PySTAMPAS: 520 s
      • stochastic search: 580 s
      • CW: 512 s
      • gstlal: O(100) s blocks
  • Summary page

    • Modified configuration file of SummaryPage klog

    • Added links to the O4c IGWN SummaryPage klog

---

20250219 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: We are currently in O4c, and will end on 7 October 2025.

      • Run plan(02/15 updated) operation (02/06)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • openMMA telecon: 2025/02/20 (online, no pre-registration required) including update reports from lvk
      • LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/31(extended).
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 02/13

    • Condor setting at Kashiwa cluster (called system-B) will be updated not to occupy by single user and to reserve CPUs for high priority jobs

    • Initial effort submission for KAGRA authorship 2025 started. The submission deadline is Friday February 21 (2025) 17:00 (JST). wiki

      • confirm what activities you or your group plan to do this year in the KAGRA detchar
    • Next meeting: 2025/02/26
  • 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

    • Addded ISC_WD_L label in lockloss guardian klog

    • Gauch update: Analysis will run when the LSC_LOCK guardian is more than OBSERVATION_WITHOUT_LINES klog

    • Reproduction of missing lockloss information klog32673

    • lockloss investigation: 2025/02/11 klog32686

    • lockloss investigation: 2025/02/10 klog32649

    • 60 - 100 Hz breathing sensitivity in current situation klog32647

    • Sensitivity breathing at 60-100 Hz: Glitch to MN or IM vertical actuators klog32628

  • Segment file

    • Reproduction of Segment files during 2025/02/8~10 klog32630

  • veto definer file wiki

    • The question about "what is the necessary minimum duration for search pipeline?" was posted to DAC WG chairs
      • X-pipeline: 64 s
      • PySTAMPAS: 520 s
      • stochastic search: 580 s
  • scattered light noise

    • Scattered light glitch at Yend klog32725

  • Hveto

    • Rerun Hveto process klog

---

20250212 (Wed.)

• canceled

---

20250205 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: O4c will now end 7 October 2025.

      • Run plan(1/25 updated) operation (1/30)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/16.
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 01/28

      • OMC DCPD B was broken. The protection system needs to be updated. Still, OMC DCPD A is alive. klog

    • The KAGRA's author list 2024 will be finalized today. The final vote by KSC members will be done tomorrow.
    • Preparation of task list for KAGRA authorship 2025 is underway.
    • The working chair of low-latency WG was taken over from S.Morisaki to Alvin.
    • Next meeting: 2025/02/12
  • 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: 2024/1/31 klog

    • lockloss investigation: 2024/12/21~12/30 klog

    • k1nds2 was stopped due to the planned power outage klog. Detchar cluster was shutdown at the same time.

  • line monitoring (Samurai)

    • line monitor update: changed the threshold to start the analysis (1/29~) klog

  • detchar cluster

    • Update HTCondor on DET cluster klog

  • pycbc triggers using the clustered segment files (Narikawa)

    • slide

---

20250129 (Wed.)

• Agenda
  • Announcement
    • O4 schedule:

      • O4c: O4c will now end 7 October 2025.

      • Run plan(1/25 updated) operation (1/23)

        • Maintenance/commissioning break from 1 April 2025 at 15:00 UTC to 4 June 2025 at 15:00 UTC
        • O4 will end on 7 October 2025 at 15:00 UTC
    • Scheduled conference
      • LVK meeting: 2025/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/16.
      • Open Data Workshop 2025/05/12-14
      • GWADW 2025: 2025/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2025/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2025/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 01/14

    • Evaluation of effort for KAGRA authorship 2024 is underway.
    • Several visitors at the KAGRA site during January
    • Next meeting: 2025/02/05
  • 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: 2024/12/21~12/30 klog

    • lockloss investigation: 2025/01/19~22 klog

    • List of lockloss time from the states related to OBSERVATION klog

    • run summary processes were restarted as ones for O4c. klog

    • The KAGRA's plan to join O4 is still under discussion.
  • Summary page

    • Modified the configuration files of DET tools klog

  • Omegascan

    • Running Omegascan at DetChar cluster klog

    • Is it possible to update the HTcondor version at detchar cluster?
  • Scattered light noise

    • slide(1/10) slide(1/24)

  • Pastavi

    • adjusting the number of images, backup of NoiseBudget data, and trend data in plotting multiple channels klog

  • line monitoring (Samurai)

    • (yamat) It's better to change the definition of the locked data from K1:GRD-IFO_STATE_N >= 100 to K1:GRD-LSC_LOCK_STATE_N >= 9900.

  • veto definer file (Uchikata)

    • slide

    • The histogram was updated.

    • They compared the results by removing T<256s or T<512s. Some short segments are not related to the occurrence of the IPC glitch.

---

20250122 (Wed.)

• Agenda
  • Announcement
    • O4b schedule:

      • O4b: O4b will now end 9 June 2025.

      • Run plan(1/15 updated) operation (1/16)

    • Scheduled conference
      • LVK meeting: 2024/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/16.
      • Open Data Workshop 2024/05/12-14
      • GWADW 2025: 2024/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2024/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2024/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 01/14

    • Evaluation of effort for KAGRA authorship 2024 is underway.
    • Several visitors at the KAGRA site during January
    • Next meeting: 2025/01/29
  • 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: 2024/12/31 klog

    • lockloss investigation: 2024/12/21~12/30 klog

    • Noise budget plot for the DARM sensitivity in November 2024 klog

    • New DARM sensitivity (2025/01/19) klog

    • Add a duration of staying in the last state to the lockloss list klog web

      • Lock duration was added to the lockloss summary page. It’s better to use a rough estimate.

      • Is it possible to show the truncated value as an integer? --> yes

  • Summary page

    • Modified the configuration files of DET tools klog

    • Changed the plotting range of range plots klog

    • The Summary page shows two kinds of inspiral range values, which are values computed by YamaT-san's script and gwsumm. There are some differences due to different configurations. In the future, it's better to clarify the cause of the difference between the two values
  • Segment file

    • Update script to generate Segment files for the past data klog klog

  • Scattered light noise

    • Scattered light noise reoprt: ASD of OPTLV channels and 2024.12.13 data klog

  • Noise subtraction of beam jitter noise around 120 Hz

    • slide

---

20250115 (Wed.)

• Agenda
  • Announcement
    • O4b schedule:

      • O4b: O4b will now end 9 June 2025.

      • Run plan(12/15 updated) operation (12/19)

    • Scheduled conference
      • LVK meeting: 2024/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/16.
      • Open Data Workshop 2024/05/12-14
      • GWADW 2025: 2024/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2024/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2024/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 12/11

    • Evaluation of effort for KAGRA authorship 2024 is underway.
    • Several visitors at the KAGRA site during January

    • Power outage around the KAGRA site --> no impact for KAGRA

    • Mail server issue, from January 10th, 21:09 to January 11th, 22:56 JST
    • Next meeting: 2025/01/22
  • 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 support
  • Line Monitor

    • Automation of the daily monitor for identifying and fitting the line noise klog

  • Segment file

    • The segment name of the IPC glitch was changed from K1-DAQ-IPC_ERROR to K1-DAQ_IPC_ERROR. klog

    • Due to IPC glitch, the locked segment will be devided into short segments. They evaluated the fraction of the short segments. The actual threshold is necessary to be determined in future. slide

    • The current favor is 256 s. When we applied this threshold, we will exclude 1% data from the science mode. We need to collect the requirements of each pipeline.
  • Noise subtraction pipelines (Chia-Jui Chou)
    • deepclean (Chia-Jui Chou)
      • run at kamioka
    • seqARIMA (David Hui, Sangin Kim)
      • run at kashiwa
    • ICA (Kume, Itoh, Yokoyama)
    • The common goal is to subtract the noise.
    • it's important to test the long term stability.

---

20250108 (Wed.)

• Agenda
  • Announcement
    • O4b schedule:

      • O4b: O4b will now end 9 June 2025.

      • Run plan(12/15 updated) operation (12/19)

    • Scheduled conference
      • LVK meeting: 2024/03/24-27 @Albert Park, Melbourne, Australia
        • Early bird registration will close at 2025/01/16.
      • Open Data Workshop 2024/05/12-14
      • GWADW 2025: 2024/05/18~5/23 @the Hilton Cocoa Beach (Florida) Oceanfront

      • Amaldi & GR: 2024/07/14-18 @Scottish Exhibition Centre, Glasgow, UK web

      • ICRC 2025: 2024/07/15-24 @Geneva (Switzerland) web

    • KAGRA site report 12/11

      • For the summary during holidays, see Miyoki-san's mail.
    • Evaluation of effort for KAGRA authorship 2024 is underway.
    • Several visiters at KAGRA site during January
    • Next meeting: 2025/01/15
  • 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 support

    • Summarize the lockloss count labeled by the SYS_LOCKLOSS guardian klog table

    • Categorization by the behavior of POP90 before the lockloss klog

  • Segment file

    • The segment of K1-GRD_PEM_EARTHQUAKE is already available on DQSEGDB. For other new segments will be available at DQSEGDB. (git issue)

    • Name convention issue came up. Plan: K1-DAQ-IPC_ERROR --> K1-DAQ_IPC_ERROR. Before releasing this segment, we have a chance to change the name.

    • We need to update other scripts if we change the segment name. Developers or maintainers, please check your code.

  • It's better to keep the code in the GitHub repository up-to-date. Remember to push the code after you modified it or confirmed it's stable.

  • The line monitor is working well during the holidays. web

---

Past meeting

• 2024

• 2023

• 2022

• 2021

• 2020

• 2019