jason.oberling@LIGO.ORG - posted 16:05, Monday 29 October 2012 - last comment - 21:16, Monday 29 October 2012(4544)
BSC1 ITMy Pitch/Yaw, Test Stand
D. Cook, J. Oberling
Measured pitch and yaw on the ITMy on the test stand this afternoon after SUS had performed adjustments. As usual, yaw is reported assuming a top down view.
-
Pitch: ~750 µrad up
- Target pitch: 12.5 µrad up
-
Yaw: ~185 µrad CCW
- Target yaw: 0.0 µrad
Note, prior to this set of measurements, I:
1) yawed the right side of R0 CW in order to alleviate the rubbing that the guys saw (and reported) last Friday.
2) Then, I moved 100g of mass from the front to the back of the M0 UIM in an effort to correct some pitch that Jason observed. I then recentered the pitch adjuster bars bringing the pitch error down to the number cited above.
3) Lastly, I yawed the M0 CW to reduce the yaw error to what Jason reports above.
BOSEMs need to be centered and then damping will hopefully work.