I performed the Bruco analysis to this data (50-400Hz).
1. 50-100 Hz
There is coherence between DARM displacement and PRCL related noise.
- around 65Hz and 80Hz -> Sound at CS area
There are also many coherences between PEMs(ACC, MIC and Seismometers). That imply there are wild wide sound at center area
- 70-85Hz -> Strong coherence between PR2 Pit and Yaw
II don't know who made this noise, but there are strong coherences.
2. 100-105 Hz
We can see several peaks, and they have coherence with ADS PR3 PIT
(PR3 ADS frequency is 51.3Hz, we need more notch filter)
3. 110 Hz, 144 Hz
Coherence with SR2 related sensors
4. 116 Hz
Coherence with ITMX PS, PRM PSD and magnetometers. Some electronics issue?
5. 128 Hz
Coherence with ITMY PS and magnetometer. Some electronics issue?
6. 165 Hz
Coherence with ITMX sensors
7. 206 Hz
As I reported yesterday, some hint in the IMC or ISS area
8. 256 Hz
ITMY PS and magnetometer
9. 258 Hz
OMC PZT HV1,2, LSC ERR, LSC FB
11. 225.3 Hz, 262.4 Hz, 328 Hz, 338 Hz, 371 Hz , 381 Hz and 395 Hz
There are coherence with PSL IP, PSL ACC and PSL MIC
If we can enter the PSL room, we may obtain some hint
Unknown, but large(but narrow) CARM related?