This report is the work for 3 days (Night time on November 28-30).
I adjusted the filter of Yarm ASC to merge from WFS to OPLEV.
The control loop was closed.
Degree of freedom: {IY, EY}{PIT,YAW}
details
Process before working
- Turned on ADS from TMSY to IMMT2, PR2.
->To put in good alignment conditions for ADS as initial alignment of Yarm. - Turned off ADS.
- Put DCoffset to set the WFS signal to 0.
->This is because there may be a WFS offset due to birefringence.
It is still under analysis whether this process will be added in the future.
Put the control in such a way that it is added to the OPLEV set point from the WFS signal.
- I measured gain when 0.1Hz is steeped.
The control loop is disconnected before the input to the filter.
Excite at 0.1 Hz from the portion of the loop that is disconnected.
PLANT data :PIT:/users/Commissioning/data/ASC/2022/REFL_WFS/Yarm/PLANT/230131/PLANT_D{HARD,SOFT}_P_0p1Hz.xml
YAW:/users/Commissioning/data/ASC/2022/REFL_WFS/Yarm/PLANT/230128/PLANT_D{HARD,SOFT}_Y.xml - I installed filters (integrator and gain). I separated filters at 0.1Hz.("test_int" and "int(Y)").
The control loop was closed.
It misaligned the error signal by putting an offset in the error signal. When I reput the offset to 0, the transmitted light power increased.
However, when the filter of ETMY was turned on, it fluctuated at 0.24Hz in PIT or at 0.18Hz in YAW.
Next
- I will check their UGFs
- Analysis of WFS offset
- If this is accepted as Yarm ASC, I will include it in the Guardian process.
