Ranking
rank |
SUS |
side couple |
diff. top/bottom |
side coherence |
1 |
ETMY |
< -40dB |
-2.0dB |
0.076 |
2 |
ITMX |
< -40dB |
-2.2dB |
0.13 |
3 |
MC1 |
-37dB |
-1.5dB |
0.39 |
4 |
MC3 |
-33.5dB |
-2.2dB |
0.86 |
5 |
ETMX |
-27.5dB |
-2.9dB |
0.91 |
6 |
PRM |
-15.7dB |
-2.1dB |
0.962 |
7 |
ITMY |
-9.6dB |
-2.5dB |
0.997 |
8 |
SRM |
-6.4dB |
-1.8dB |
0.999 |
9 |
BS |
-5.4dB |
-1.8dB |
1.000 |
10 |
MC2 |
-7.6dB |
-12.0dB |
1.000 |
- side couple : ratio between highest sensitivity sensor of 4-face sensors to side sensor
- diff. top/bottom : ratio between highest and lowest sensitivity sensor of 4-face sensors
- side coherence : coherence between LSC excitation to side sensor.
Transfer function from LSC excitation to each OSEM sensor was used here. Measurement was done using swept sine mode from 100Hz to around 2Hz, and 5Hz data was picked up for this ranking.
From this ranking, our traget suspensions of this venting are MC2, BS, SRM, ITMY, PRM
Procedure
1.Have an access to a target suspension
- South(West) door of MC2 chamber for MC2
- Access connector of Y arm for BS and PRM
- North door of BS chamber for SRM
- West door of ITMY chamber for ITMY
2. Copy
- /cvs/cds/caltech/users/miyakawa/20060914_vent_OSEM/200508231730_7Hz_sine_ETMX_after_OSEM_fixed.xml
to somewhere.
3. Open copied file from DTT and change channel names for target suspension.
4. Turn LSC switch of target suspension on.
5. Run DTT
6. Rotate OSEMs which have big peaks at 12Hz and 17.5Hz until the peaks become enough low.
7. After done, check improvement using these files on DTT;
- /cvs/cds/caltech/users/miyakawa/20060914_vent_OSEM/20060913_sine_pos_sensor_xxx.xml (xxx is suspension name).
8. Make a new ranking.