Minute of KAGRA commissioning meeting

• Date: 2018/6/5 11AM~12PM
• Attendance: Miyakawa, Uchiyama, Aso, Yamamoto, Yokozawa, Enomoto, Stefan
  • eZuce: Izumi, Nakano, Inoue, Yamamoto(Toyama), Suzuki, Miyoki, Ushiba, Eleonora, Shoda, Tegoshi

0. Schedule

• k1ix0 will be needed by September for NAB PD.

1. X arm commissioning

• JGW-T1808343

• Do we need WFS?(Eleonora) -> Yes, with control system.(Izumi)

• Gouy phase measurement for green is also necessary. (Akutsu)
• Both mirrors are at the room temperature. (Uchiyama)
• Needs preparation list. (Aso)
• Loss measurement will performed mainly reflection light. (Izumi)

• Simulation of loss? (Eleonora) -> Hirose, Hiro Yamamoto

• Camera view? (Stefan) -> PCal camera, transmitted camera

• Which port will be used for locking? (Miyakawa) -> REFL port

2. New 40 W laser

• RIN measurement

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=5055

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=5124

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=5126

  • Non-stational noise happens but it is not related water cooler.
  • This RIN level cannot reach shotnoise level with the first ISS loop. Current noise is 2 orders lager than NPRO noise. Needs 2nd loop to reach design level.
• Beam profile

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=5068

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=5084 - OSA measurement

  • http://klog.icrr.u-tokyo.ac.jp/osl/?r=5139

3. PMC electronic hack

• http://klog.icrr.u-tokyo.ac.jp/osl/?r=5155

• MATSUSADA HV driver has 10uV/rHz, quite high.
• Slow output can be used as offset, and 2nd EXC point will be used as input.
• LIGO is not using temperature controller. (Stefan)

Others

• Next meeting: 5/29.