Weekly PEM meeting
- 2020/03/20(Tue) 14:00-(JST)
- Regular meeting meeting (Japanese)
Web meeting with Zoom2 (Zoom2)
- member : Nagano, Ohkawa, Takano, RTakahashi, Washimi, Tomaru, Kozakai, Yokozawa
General issue
- Interferometer status
- 3/10 - commissioning break started
- Noise projection
- Hammering test (Sat. and Sun. morning time)
- DRFPMI lock trial
- Noise budget was (almost) completed
- Below 70 Hz : Type-A control noise
- 100 - 200 : Actuator DAC noise(?)
- 200 - 400 : Acoustic noise around IMM area (?)
- Above 400 Hz : Shot noise, Laser noise(Intensity, frequency)
- 3/10 - commissioning break started
- PEM tasks in March
- PRM booth MICを常設にしませんか？ (IOO1 BNC ch11かch12で)
Each progress
- Discussion about the list of the general issue (Yokozawa)
- Acoustic injection and hammering test result (Washimi)
Data and Results list : KAGRA/Subgroups/PEM/PEMinjection/O3
KAGRA Noise INJection Analizer; NINJA : JGW-T2011564
- Plan of the lock loss study (Fujikawa)
Minutes
- Yokozawa will make the todo list for Saturday and Sunday hammering test
- Check again the IMC gate valve (Open and Close lock trial with close the gate valve, ...)
- Discussed about the offline subtraction (including to online?)
- Hammering test and acoustic injection to REFL table area
- There is coherence with the DARM, PRCL. Not so in CARM, MICH
- Laser fluctuation
- The hammering effect is largest around IMC bellows. And effect became smaller when we hammered far from MCF chamber.
- The effect of the hammering to MCF chamber itself is not so large
- From the noise projection to the accelerometer, the dominant vibration source would come from acoustic
- We turned out 500Hz may come from REFL table, but we didn't identify which optic may make
- There is coherence with the DARM, PRCL. Not so in CARM, MICH
- NINJA
- Only work in the k1ctr7 (Environmental dependence)
- Investigation the scattering light effect by injecting the low frequency fluctuation
- So called shoulder noise
- Including to scheduling
- camera setup inside the vacuum