aLIGO LHO Logbook

H1 AOS

jason.oberling@LIGO.ORG - posted 09:08, Wednesday 05 February 2014 - last comment - 10:21, Wednesday 05 February 2014(9833)

ETMy Cartridge Alignment

IAS: J. Oberling

SUS: B. Weaver, T. Sadecki

Finished the ETMy cartridge alignment yesterday. The position & angular errors are as follows (all yaw reported as viewing the relevant optic from the top down):

Longitudinal: -0.4 mm
- Tolerance: ±3.0 mm
Lateral: +0.1 mm
- Tolerance: ±1.0 mm
Vertical: -0.3 mm
- Tolerance: ±1.0 mm
Pitch: 645 µrad down
- Target: 639 µrad down
- Error: 6 µrad down
- Tolerance: ±100 µrad
Yaw: 80 µrad CCW
- Target: 0 µrad
- Tolerance: ±100 µrad

Also measured & aligned the ERMy (Note: the ERMy is aligned parallel to the AR surface of the ETMy) and measured the gap between the ETMy and ERMy.

ETMy/ERMy Gap: 5.05 mm
- Tolerance: ±0.25 mm
ERMy Pitch: 1.671 mrad down
- Target: 1.971 mrad down (to match the ETMy AR surface)
- Error: 300 µrad up
- Tolerance: ±1.47 mrad
ERMy Yaw: 245 µrad CW
- Target: 80 µrad CCW (to match ETMy AR surface)
- Error: 325 µrad CW
- Tolerance: ±1.47 mrad

Comments related to this report

betsy.weaver@LIGO.ORG - 10:21, Wednesday 05 February 2014 (9837)

Link

Note - we discovered yesterday that the Kentek gap detector was highly dependent on how level it's mounting was. So, the measurement is only good to about +/-0.25mm.