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 * Plan of the lock loss study (Fujikawa)

Weekly PEM meeting

  • 2020/03/06(Fri) 14:00-(JST)
  • Regular meeting (Japanese)
  • Web meeting with Zoom2 (Zoom2)


General issue

  • Interferometer status
    • Observation run started without O3 joining
    • Maximum 500kpc BNS detection range
    • Lock duration is 1h -4h
      • Alignment dependence
    • Duty cycle ~65%
      • We need ~1h for initial alignment
    • If microseismic motion is large, we could not lock the interferometer
    • 3/10 - commissioning break
  • Commissioning break (2020/03/10 9 am -03/24 9 am)
    • After the commissioning meeting, I and Washimi-san make the schedule.
  • PEM tasks March
    • PEM injection
      • Acoustic injection
        • Acoustic injection to PSL room was done
        • Acoustic injection to REFL table was done.
          • We set additional accelerometers to the leg of the MCF chamber ground, IMMT1/ISS and PRM chamber leg klog13293

          • Analysis is ongoing by Washimi-san ant TTanaka-san
    • Hammering test
      • 20/01/21 Minute

      • Hammering tests to the OMC, SRs, BS and PR2 were done [http://klog.icrr.u-tokyo.ac.jp/osl/?r=13138|klog13138]

        • There is large excitation when we touched the legs of the OMC chamber
        • But we concluded that vibration of the logs of the OMC chamber were not the dominant noise source in the current sensitivity
        • Next target of investigation is the duct between PR2 and BS
          • Candidate of the 60-90Hz noise
    • Discussion about the PEM flags
      • This may not be used during O3 run, but it is good practice toward the O4 run
      • Help the RRT(Rapid Response Team, quick discussion for the event submitted to the GraceCB)
      • Seismic motion flag
    • Evaluate the effect of the FFUs and vacuum pumps by turning on during interferometer lock
      • If the excitation detected, we have to consider about the FFUs which are working.
  • Conference
    • F2F (2020/4/17-20 @ Kashiwa) wiki

Each progress

  • Discussion about the list of the general issue (Yokozawa)
  • Bruco analysis (Yokozawa)
  • PEM coherence search to the longer locked data (Yokozawa)
  • GND meeting report (Yokozawa)
  • Acoustic injection result (Washimi, TTanaka)
  • Seismometer tilt coupling (Washimi, Miyo)
  • 23.3Hz noise investigation (TTanaka)
  • Plan of the lock loss study (Fujikawa)

KAGRA/Subgroups/PEM/Meeting/200306/Agenda (last edited 2020-03-06 13:58:04 by tatsuki.washimi)