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.

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.