Gabriele, Sheila, Evan, Alexa
Summary
We now have new green alignment references for the WFS that should bring us to a better alignment while on resonance.
Details
Now that we have enaged more ASC loops and touched up the alignment while on resonance (i.e. we acheived a recycling gain of 29), I have updated the green QPD offests and the ITM camera nominal positions in hope that this will improve our initial alignment. For reference, I have also included the old values that we have been using.
| Y-ARM | OLD | NEW |
| QPDA P | 0.0 | 0.3 |
| QPDA Y | 0.5 | 0.1 |
| CAMERA P | 229.9 | 216.5 |
| CAMERA Y | 315.2 | 302.6 |
| X-ARM | OLD | NEW |
| QPDA P | 0.0 | -0.08 |
| QPDA Y | 0.0 | 0.09 |
| CAMERA P | 248.3 | 241.3 |
| CAMERA Y | 354.8 | 369.6 |
Note: we had touched up the ITMX camera nominal position once before (LHO#16825). After one of our locklosses we ran the green wfs on the y-arm ONLY with this new configuration, and went through our inital alignment procedure. These new values seemed to be good. After another locklos, we then ran the green wfs on the x-arm to test this new configuration, and went through the inital alignment once again. This also seemed to be fine.