k.tanka, c.hirose
We considered that the Sensing matrix ratio would not change significantly from day to day. （23087）
So I aligned the resonator axis to match the center of the QPDs of TMSY, aligned the incident light axis and the resonator axis with ADS, then record offloaded IMMT2 and PR2 with goodoplev and turned off ADS. Sensing matrices were measured in this state.
(Originally, I would have liked to excite at an earlier frequency with ADS on and make the measurement, but due to the ADS of IMMT2 returning to TM and the OLDAMP of PR2 being a complicated path, I turned ADS off.)
After the ADS stabilized, the DC offset was measured, averaged over a 5-minute period. We have installed an offset to the WFS signal.
(Using script /user/Commissioning/script/asc/Yarm/measure_avg_std.py)
We assume feedback control from the WFS signal back to IMMT2 and PR2.
Set sensor : DHARD->IMMT2, DSOFT->PR2.
When I measured each sensor, it seemed that I could see a signal for each degree of freedom.
However, when the PLANT measurement was performed, the coherence was abnormally low.
I measured the spectrum of the WFS and it does not seem to see the movement of the other mirrors.
The possibilities are the following.
- The sensing matrix uses the 10Hz result of WFS/oplev with 10Hz excitation of the mirror, but does not consider the phase rotation of the gain switch of the oplev.
- Since the coherence of QPD1 is slightly lower depending on the degrees of freedom, it is necessary to consider which degrees of freedom should be returned. (Simulation results should also be checked)
- The IMMT2 oplev signal produces exactly the same spectrum results for PIT and YAW.
Sensing matrix : /user/Commissioning/data/ASC/2022/REFL_WFS/sensmat/20221130/center/TF_ASC_Yarm_REFLWFS_OVLEV_{PR2,IMMT2}_{P,Y}.xml
PLANT : /user/Commissioning/data/ASC/2022/REFL_WFS/PLANT/20221130/PLANT_{IMMT2,PR2}_{DHARD,DSOFT}_{PIT,YAW}.xml
measure sensor : /user/Commissioning/data/ASC/2022/REFL_WFS/sensmat/20221130/{DHARD,DSOFT}_{P,Y}.xml
spectrum: /user/Commissioning/data/ASC/2022/REFL_WFS/PLANT/20221130/spc_PR2_IMMT2.xml
