jason.oberling@LIGO.ORG - posted 15:00, Tuesday 13 November 2012 (4684)
BSC1 ITMy Cartridge Alignment
IAS: D. Cook, J. Oberling
We continued with the cartridge alignment today, finishing up the final tweaks. The final CP alignment is:
-
ITMy/CPy Gap: 20.35 mm
- Target: 20 mm
- Tolerance: ±0.25 mm
- A verbal waiver on the 0.1 mm out-of-spec on the gap was given by N. Robertson, since this is not the final CP (there will be a switch at a later date)
-
CPy Pitch: 1.16 mrad down
- Target: 1.33 mrad down
- Tolerance: ±1.4 mrad
-
CPy Yaw: 582 µrad CCW
- Target: 0.0 mrad
- Tolerance: ±1.4 mrad
This puts the CPy alignment within spec, so we then double checked the pitch/yaw of the ITMy to make sure our CPy tweaks did not disturb the previous ITMy alignments:
-
ITMy Pitch: 29 µrad down
- Target: 12.5 µrad up
- Tolerance: ±160 µrad
-
ITMy Yaw: 7 µrad CW
- Target: 0.0 mrad
- Tolerance: ±160 µrad
The ITMy pitch/yaw is still well within spec, so this completes IAS work on the BSC1 cartridge. Doug then centered all the OSEMs, and we left the damping ON for both chains.