I tested again the OMC aligment with low frequency lines, as in 76335
It looks like there is still some modulation of the DARM line amplitude at 410.x Hz. There is also some effect on the pitch jitter line amplitude, but no effect on the yaw jitter line amplitude.
New offsets that simultaneously make the DARM calibration line maximum and the pitch jitter minimum:
| Old | Diff | New | |
|---|---|---|---|
| A PIT | -0.25 | -0.07 | -0.32 |
| A YAW | 0.1 | 0.1 | 0.2 |
| B PIT | -0.05 | -0.05 | -0.1 |
| B YAW | 0.07 | -0.01 | -0.03 |
I put those offsets in. The range dropped. So they are not good. I don't understand why. I reverted them. The range went back. A step in the other directions did not change the range much, but KAPPAC dropped.
I checked that indeed GDS-CALIB_STRAIN was worse with the alignment offsets that made the range lower
Disregard the previous plot, there were two glitches in the data. DARM is slightly worse, but as significantly as thought.
