On Monday a new driving matrix of PR mirror actuation has been measured and updated.
| OLD | NEW | |
| UL | 1 | 1 |
| DL | 0.841 | 0.8444 |
| UR | -0.907 | -0.9068 |
| DR | 0.7487 | 0.7518 |
The difference is very small (~ 0.3 %), but it is enough to change the effect of the longitudinal action on alignment stability. The effect is visible comparing the latest earthquake to the previous one. The maximum amplitude of the longitudinal action was similar (plot 1,1), but the effect on PR_TX was clearly reduced (plot 2,1), and the sidebands were much more stable (plot 2,2).
