Hirose, Tanaka(remort)

We thought that the phase margin of EY's PIT and YAW control was not enough because of fractuation. 
So I tried to start adjusting it, but it did not lock in the first place.

• The sensing matrix remains klog23230 until now.
  I remeasured the sensing matrix with the WFS offset removed.
  (Sensing matrix data: /users/Commissioning/data/ASC/2022/REFL_WFS/Yarm/Sensmat/230201/TF_ASC_Yarm_REFLWFS_OPLEV_{ITMY,ETMY}_{P,Y}.xml)

  DoF	IY_PIT		EY_PIT		IY_YAW		EY_YAW
  before/after	b	a	b	a	b	a	b	a
  QPD1 17MHz PIT	775.671	-1020.41	-1339.92	-448.68
  QPD2 17MHz PIT	-1944.91	-1168.97	119.116	1390.75
  QPD1 17MHz YAW					-1359.92	forgot to save data	-1486.03	-178.791
  QPD2 17MHz YAW					2472.84		911.57	1495.8

  The sensing matrices of both are very different; the relative ratios are also very different for QPD 1 and QPD 2.

• Remeasured Coupling of each DoFs.("DHARD" filter-->EY,"DSOFT" filter-->IY)
  data:/users/Commissioning/data/ASC/2022/REFL_WFS/Yarm/Sensmat/230201/{ITMY,ETMY}_{PIT,YAW}.xml
  I set up a filter for each degree of freedom at klog23230, but the coupling is terrible.
• Checked DC offset after turning off ADS. This is very different from the DC offset of yesterday(klog23758)

These causes...
We have not been able to solve the problem yet.

• Possibly clipping somewhere.(klog23596)
• Beam spot of ITMY. -> The beam spot position in TMSY does not seem to change much.
  (The first work was to turn on ADS, so the incident axis and the cavity axis were possibly aligned. I just post it here for information.)