Minute of KAGRA commissioning meeting

• Date: 2018/5/8 11AM~12PM
• Attendance: Miyakawa, Yamamoto, Aso
  • eZuce: Suzuki, Hirose, Yokozawa, Izumi, Ushiba
• 5/28 extension meeting

1. Discussion after operation

• IFO, ETMs: Izumi, Yamamoto
  • Well done! Duty cycle is 80-90% in 1-5days, and 15-60% in 6-9days.
  • IMC was quite stable.
  • ETMY was dominant for stability of IFO in the last 4 days.
  • Optical gain fluctuated 20~30% due to the contrast defect.
  • BS coupling between L to P and Y was sometimes dominant for the contrast.
  • Error of Sunup asymmetry was also dominant by optical gain.
• DAQ
  • DAC of PR3 was dead. Restarting k1pr3 fixed this problem. We are not sure the cause.
  • Timing of dc0 sometimes shifted. Restart daqd of k1dc0 fixed this problem. We are not sure the cause.
  • Diaggui calculates float and sometimes coherence could not be measured.
  • We switched VIS models to 2kHz to avoid glitches.
• Satellite box should be replaced to have more capacitance.

2. Discussion after phase1

• ETM leak was triggered 1week delay.
  • Records of opening flange are very important.
• Manual for VIS and clean booth should be prepared.
• Mirror schedule should be checked frequently.
• Optimization of Each DOF of VIS takes 1 day, full VIS take 22 days.
• Hammaring test of ETMY showed that something hitting.
  • Cable was well placed for ETMX. Fixing ETMY should be scheduled. (Ushiba)

3. Phase 2

• Each stage and target

3. Tasks or discussions

• 5/28 extend chief meeting for looking back phase 1.

Others

• Baffle at ETMX will extracted in the week of 5/7, and it will be black coated.
• Next meeting: 5/8.

1. Discussion after the phase 1 including operation

• IFO
  • LSC, CAL etc.
• damping
• DAQ
• Cryogenic
• Vacuum