jason.oberling@LIGO.ORG - posted 16:30, Friday 09 November 2012 (4660)
BSC1 ITMy Cartridge Alignment
IAS: D. Cook, J. Oberling
SUS: B. Bland
Well, what was supposed to be a simple tweak turned into a day-long adjustment. As Betsy wrote below, a magnet replacement block turned a simple pitch tweak into a whole day of iterative pitch/yaw adjustments. The pitch and yaw of the ITMy were finally adjusted to the following values (yaw is reported assuming a top-down view):
-
Pitch: 55 µrad up (with no First Contact)
- Target: 12.5 µrad up, ±160 µrad (with no First Contact)
-
Yaw: 80 µrad CW
- Target: 0.0 ±160 µrad
We will set the gap/parallelism between the ITMy and CPy first thing Monday morning. This will require a brief switch to Laser Hazard for the parallelism measurement (or measurements, depending on whether or not adjustment is required). We will also take a look at the CPy roll and adjust as required. The shield was placed over the front face of the quad and the cover pulled down for the weekend; damping was left OFF for both chains.