[Keiko, Lucia]
Today we spent some time to try to engage the PRC1 and PRC2 loops.
[Keiko, Lucia]
We closed the PRC1_PIT loop with low gain but we saw large coupling in PRC2 error signal and the situation does't changed yet when the PRC2 loop was engaged too. Suspencting some sensig coupling we decided to measure again the sensing matrix.
Old matrix:
| WF1 RF45I | WF2 RF45I | |
| PRM | -0.003 | 0.003 (PRC1) |
| PR3 | 0.003 | (PRC2) |
New matrix
| WF1 RF45I | WF2 RF45I | |
| PRM |
0.014 |
0.014 |
| PR3 | -0.007 | 0.009 |
The new matrix is quite different from the previus one:
-the coefficients and the signs are changed
-SR3 motion is also sensed by WF2.
We did't test it yet the because the IFO is not so stable today.
Anyway before to test it we want measure again and check the results.
Note
The domodulation phases of WF1 45 and WF2 45 have been rotated by 90 degrees and -135 degrees respectively