Minute of KAGRA commissioning meeting
- Date: 2018/6/12 11AM~12PM
- Attendance: Miyakawa, Aso, Yamamoto, Tomura, Enomoto
- eZuce: Izumi, Inoue, Yamamoto(Toyama), Suzuki, Miyoki, Yokozawa, Ohashi, Izumi, Nakano, Stefan
0. Schedule
- k1ix0 will be needed by September for NAB PD.
ETMX status
http://klog.icrr.u-tokyo.ac.jp/osl/?r=5224
- ring on f0 got lower and on the f1 by a few mm.
- f0 TF had no response. Line to coil was cut. It had been repaired before and it was used again.
- It will be fixed around September as 1week work. Whole coil will be replaced.
X arm commissioning/preparation
- WFS target: 10nrad.
Satellite box modification
- 100nF cap will be implemented to avoid an oscillation. It introduce 41Hz pole.
MC realignment
FSS BO
PMC installation, circuits, adding offset
IOO schedule
1. X arm commissioning
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
- 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
3. PMC electronic hack
- 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.