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== Weekly PEM meeting ==
 * 2020/03/20(Tue) 14:00-(JST)
 * Regular meeting meeting (Japanese)
 * Web meeting with Zoom2 ([[https://zoom.us/j/6676627462|Zoom2]])
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 * member : Nagano, Ohkawa, Takano, RTakahashi, Washimi, Tomaru, Kozakai, Yokozawa
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 * Sorry for the meeting at the national holiday.
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  * Two weeks observation was finished
   * Maximum 594kpc BNS detection range
   * Maximum Lock duration is over 10h
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   * DRFPMI lock trial
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   * 70 - 100Hz : Unknown
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==== Minutes ====

 * Yokozawa will make the todo list for Saturday and Sunday hammering test
 * Check again the IMC gate valve (Open and Close lock trial with close the gate valve, ...)
 * Discussed about the offline subtraction (including to online?)

 * Hammering test and acoustic injection to REFL table area
  * There is coherence with the DARM, PRCL. Not so in CARM, MICH
   * Laser fluctuation
  * The hammering effect is largest around IMC bellows. And effect became smaller when we hammered far from MCF chamber.
  * The effect of the hammering to MCF chamber itself is not so large
  * From the noise projection to the accelerometer, the dominant vibration source would come from acoustic
  * We turned out 500Hz may come from REFL table, but we didn't identify which optic may make

 * NINJA
  * Only work in the k1ctr7 (Environmental dependence)

 * Investigation the scattering light effect by injecting the low frequency fluctuation
  * So called shoulder noise
  * [[https://logbook.virgo-gw.eu/virgo/?r=38028|Virgo work by Nagano-san]]
  * Including to scheduling

 * camera setup inside the vacuum

Weekly PEM meeting

  • 2020/03/20(Tue) 14:00-(JST)
  • Regular meeting meeting (Japanese)

  • Web meeting with Zoom2 (Zoom2)

  • member : Nagano, Ohkawa, Takano, RTakahashi, Washimi, Tomaru, Kozakai, Yokozawa

General issue

  • Interferometer status
    • 3/10 - commissioning break started
      • Noise projection
      • Hammering test (Sat. and Sun. morning time)
      • DRFPMI lock trial
    • Noise budget was (almost) completed

      • klog13600

      • Below 70 Hz : Type-A control noise
      • 100 - 200 : Actuator DAC noise(?)
      • 200 - 400 : Acoustic noise around IMM area (?)
      • Above 400 Hz : Shot noise, Laser noise(Intensity, frequency)
  • PEM tasks in March

    • task list

    • PRM booth MICを常設にしませんか？ (IOO1 BNC ch11かch12で)

Each progress

  • Discussion about the list of the general issue (Yokozawa)
  • Acoustic injection and hammering test result (Washimi)
  • Plan of the lock loss study (Fujikawa)

Minutes

  • Yokozawa will make the todo list for Saturday and Sunday hammering test
  • Check again the IMC gate valve (Open and Close lock trial with close the gate valve, ...)
  • Discussed about the offline subtraction (including to online?)
  • Hammering test and acoustic injection to REFL table area
    • There is coherence with the DARM, PRCL. Not so in CARM, MICH
      • Laser fluctuation
    • The hammering effect is largest around IMC bellows. And effect became smaller when we hammered far from MCF chamber.
    • The effect of the hammering to MCF chamber itself is not so large
    • From the noise projection to the accelerometer, the dominant vibration source would come from acoustic
    • We turned out 500Hz may come from REFL table, but we didn't identify which optic may make
  • NINJA
    • Only work in the k1ctr7 (Environmental dependence)
  • Investigation the scattering light effect by injecting the low frequency fluctuation
  • camera setup inside the vacuum

KAGRA/Subgroups/PEM/Meeting/200320/Minute (last edited 2020-03-21 04:16:10 by TakaakiYokozawa)