sheila.dwyer@LIGO.ORG - posted 21:57, Thursday 25 September 2014 - last comment - 14:31, Friday 26 September 2014(14161)
more baffle PDs
Baffle PDs, now with the correct labels:
| TMSY | ITMY | ETMY | |
|---|---|---|---|
| PD1 | (-69 PIT, -71 Yaw) | (165, -105.3) | (62, -77) |
| PD4 | (-149.5 PIT, -2 Yaw) | (197, -139) | (91, -40) |
| centered | (-109.25, -36.5) | (181, -122) | (76.5, -58.5) |
Especially in pitch, these are rather different from what we found yesterday, which is not too suprising since we were hitting the ITM somewhere far from the center yesterday. There is a beam at the end station coming back from the ITM, and some fringing at ISCT1. To be continued....
The Y arm is locked on green. This morning I tried to focus all the ITM cameras, I still had some difficulty but the images are much better than before kiwmau adjusted the gains. We also changed the sign on the TMSY alingment slider gain, it is now -158.
This means that the PIT values in all of our past alogs will now be wrong by a minus sign. It also means that TMSY now has the same sign convention as all the other suspensions for pitch.
The atached screen shot shows the camera images, alignement biases, and beckhoff settings with green locked in the Y arm (although there is still a significant amount of power in higher order modes).
Note:
We only changed the slider sign because it was convenient.
However, if the BOSEM output should be consistent with Euler coordianate system, TMSY BOSEM input matrix and output matrix should be changed and the slider sign should be brought back.