Minute of KAGRA commissioning meeting

• Date: 2018/7/24 11AM~12PM
• Attendance: Miyakawa, Aso, Enomoto, Yokozawa, Kozakai
  • eZuce: Miyoki, Suzuki, Nakano, Shoda, Ushiba, Yamamoto, Kimura, Uchiyama

LAS (Nakano)

• 40W laser started working on last Friday.
  • Limite 1W will be used to alignment or so.
• Remote desktop will be installed on Windows PC for 40W laser control.
• Monitor of laser power should be displayed on door or something.

PSL, IOO

• MZ of single arm mode matching is much better now. No Lager-Gaussian is seen.
  • MZ contrast is 99.4% and 96.9%. Second one has 3m arm length difference.
  • Lock wil be tried soon. Common mode servo will be used to control MZ.
• RAM(residual amplitude monitor) monitor will be installed.
• ISS TF model and measurement were done. Model still does not have phase delay at high frequency.
• RIN is limited by PD dark noise up to 1kHz. Shotnoise is almost comparable.
  • UGF is currently 10kHz. Above 1kHz, suppression is not enough. It will be limited to 50kHz max in future by a commercial AOM driver of speed of variable attenuator..

Check list for IXC

• Meeting will be assigned on one of 8/15,16,17.
• WAB, NAB are the additional items.
• Mirror position should be in the item list.
• WAB PD will be installed at the sometime.
• The number of opening flange should be minimized. It must be listed up.
• Oplev of ITMX will be installed.
• Safety for high power laser must be considered.

ETMX (Miyamoto)

• Oplev power goes down with switch of cryostat.
• Also ETMX QPD shows 1/10 or lower power in 10 hour without relationship of switch of cryostat. One of the viewport looks dewed.
• One of the motor seemed to be stuck.
• F2 of ETMX fell bistable point, and it is stuck.

DGS

rack cleaning

• BS is almost done.
• PEM meeting will be held 8/1 6pm.

Others

• Next meeting: 8/7.