• KAGRA
• Subgroups
• PEM
• Meeting
• 191105
• MinuteEN

Minute of PEM meeting (English ver.)

• Date: 2019/11/05 17:00-18:00(JST)
• Attend：Yokozaqwa, TNTanaka, Fujikawa, Ohkawa, Washimi, Mori, Kozakai, Yamada, Akutsu, Kaihotsu

Agenda

• General issue
  • Interferometer status
    • Now, we can lock the interferometer stably
    • ISS(Intensity Stabilization System) was implemented, better sensitivity

    • Long silent run at 2nd Nobember (klog11312)

    • See the detail in url

    • Silent run -> Some excitation(including calibration line) -> PEM injection -> Hardware injection

• PTEP paper
  • [kagra 03133]
  • KAGRA Overview papers
  • Overview of KAGRA : (3) Detchar, calibration, physical environment, data quality
• Next F2F meeting
  • RESCEU
  • 4th and 5th Dec., 2019
  • 1 slot Washimi-san will have a talk
  • If you plan to write master/doctor thesis, please let me know
    • Master thesis : TTanaka(ICRR)
• Chrome Book project (Portable PEM researcher)

  • http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/PEM/Portable

  • We prepared two PEM Chromebook
  • Start writing paper (PTEP?)
• PEM injection
  • Shaker injection1 (TTanaka, Yokozawa)

  • Shaker injection2 (Okutomi, Fabian) -> After O3

  • acoustic injection (TTanaka, Yokozawa)
  • magnetic field injection (Niigata Tanaka, Fujikawa, Yokozawa)

  • RF injection (TTanaka, Washimi) -> After O3

• Weekly PEM measurement
  • Friday is weekly PEM measurement
  • Understanding the effect of the instruments, search the origin of noise, and so on
  • Tentative : New vacuum pump, 18V DC noise(24Hz), Cryochamber vibration(46Hz), FFU, Noise search
• Database for the KAGRA characteristic lines

  • url

  • NoEMi
• Visitors from LVK
  • Anamaria from Livingston : 18 - 29 Nov.
  • Federico, Irene, Camilla (input optics) + Francesca from Virgo : 11/18-12/7 (2 weeks@KAGRA, 1 weeks@NAOJ)
    • We will ask them about the status talk of the commissioning break and reviewer

  • LVK PEM meeting (11/26)

  • Fujikawa, TNTanaka 11/24-12/3
• Each progress
  • Yokozawa
    • Current serious noises
      • 24Hz noise (100V AC + AA?)
        • We connect/disconnect the GND JP in the AA chassis, but could not understand
      • MICH control noise
        • Add the noise projection of the MICH control noise
      • Coherent with ITMX MN YAW
        • Wait for the noise budget of the Type-A control
      • Coherence with ITMY TM PIT
        • Wait for the noise budget of the Type-A control
    • Daily summary page
      • Update PEM, VIS, FPMI part
  • Washimi
    • Summary of coherence study between PEMs and DARM displacement

      • Calculated the coherence between DARM displacement and PEM channels for long locked data (>1h, 500average)

      • We can see the coherence between DARM and EXC MAG Y at 11Hz, but we couldn't see peak when he went to end station, coincidence with LOCK status?
      • Coherence with PCal RxPD at 1.3Hz, ETMY gas excitation made the large oscillation, Pcal detected as long oplev
      • 24Hz is serious rack noise
      • 44,45Hz Compressor or FFU?

      • Compressor sound make44Hz, 46Hz and 56Hz -> stop during observation, check the coherence with FPMI signal

      • The 60Hz peak of the EXC MAG is larger than other MAG, this imply the dark GND at Xend station
      • It turned out acoustic noise search inside the PSL is difficult, we prepared the multiple microphone and see the data at the same time.
      • laser amp made the ~110Hz vibration and injected to the noise, similar path with 24V power supply vibration(white rack)
      • 840Hz IMC refl
      • We need to classify the Priority to the noises, it is different between identification and hunting
  • Washimi, Yamada, TTanaka

    • IXC vibration -> See the Yamada-san's slide

      • Identify the origin of the frequency noise
      • 42Hz is resonant frequency of the pylon

      • 44Hz Whimsical compressor -> checked by them

      • 46.125Hz

      • 54.125Hz Whimsical compressor -> checked by them

      • 58 sound origin?
      • Some peaks were grow up by the acoustic injection, due to the scattered light?
      • There is data which can take coherence between DARM and accelerometers which were placed in the IXC chamber
      • There is some coherence between DARM and MIC at center area, there is no coherence with end mic

      • There is coherence with ITMX MN P <20Hz

      • There is coherence at 46Hz between DARM and ACC at the TM oplev table, this is some hint for 46Hz noise
      • Also MIC at 46Hz
      • We want to check the condition with various air compressor
  • Kozakai
    • Trigger analysis with silent run
    • Auto process was run when we can take the silent run, the glitch plots were generated for the long silent run, please check the Yuzu summary page

      • example

    • glitch plot catalog
    • There is coincidence between large glitch and magnetometers and/or seismometers, suspension jump.

    • Fabian requested that there is coincidence between OL jump and glitch -> check later

  • TTanaka(ICRR), Washimi, TTanaka(Niigata), Yamada
    • Acoustic injection with FPMI
    • No report in this meeting
  • Mori, Nakayama
    • Vacuum pump vibration
    • They stopped six vacuum pump(dry、turbo) at the center area(BS) at last Friday, they didn't stop the ion pumps, ion pumps will not be stopped during observation.
    • Compared the vibration between turbo pump on and off
    • Pressure value became twice worse, but there is no serious problem, this imply the outer gas is not so large
    • New low vibration vacuum pump characterization
    • They summarized the vibration and sound from the vacuum pumps
    • The behavior of the noise floor at 200Hz is interested、the floor in case of the OFF is larger than in case of the ON, 214Hz and 216Hz
  • Fujikawa, Mori
    • fujimopy
      • Peak identification for the two cases (ex: pump on/off)
        • Average is important to reduce the statistical error
        • Available from the diaggui
      • html viewpage in the ICRR computer : change 40-50Hz to 7-11Hz?
    • Line amplitude web page
  • Fujikawa, Washimi
    • Lock loss study

      • root histogram-> gauss fitting and check the significance->Easy identification of the lock loss

      • Lock loss due to the IXC acoustic injection->pulse like injection or excitation?

      • Stat the investigation for the lock loss of the FPMI
  • TTanaka(Niigata)
    • Preparation of the coil
    • 24Hz noise situation
    • Made the coil driver for the PEM injection
    • Discussed about his thesis and MAG injection
  • etc