Jenne, Hang
We modified the old ASC sensing matrix code and did a measurement for the PIT dofs. The whole sensing matrix can be found at /ligo/home/hang.yu/Desktop/ASC/SenMtrx/rec/Aug232018225636UTC/html_rec_rad2W_1219100214.html. The calibration was based on some old scripts so we would need to double-check if they were still correct.
For now we just focus on the input-common arm dofs in PIT. For the three interferometrical dofs (currently we chose them to be INP1 -- > IM4, PRC2 --> PR2, and CHARD), the response matrix is
| REFL_A_RF9_I | REFL_A_RF45_I | REFL_B_RF9_I | REFL_B_RF45_I | POP_X_I | |
| CHARD | -0.56 | -0.96 | -0.44 | -1 | 0.15 |
| PRC2 (PR2) | 0.22 | -0.15 | 0.07 | -0.12 | -1 |
| INP1 (IM4) | 0.71 | 0.72 | -0.72 | -1 | -0.03 |
This suggested that we might update the input matrix to for better decoupling the dofs:
| REFL_A_RF45_I | REFL_B_RF45_I | POP_X_I | |
| 1 | 0.7 | 0 | CHARD |
| 0 | 0 | -0.05 | PRC2 |
| 1 | -1 | 0 | INP1 |
We didn't finish the yaw measurement and the AS port signals did not have a good coherence. Will update the drives when we get a chance next time.