jason.oberling@LIGO.ORG - posted 12:36, Tuesday 17 November 2015 - last comment - 07:28, Wednesday 18 November 2015(23473)
H1 Optical Lever Re-zeroed
Today I re-zeroed all of the active H1 optical levers. The table below shows their pitch/yaw values before re-zeroing and the values as they read when I finished each oplev (there could be relaxation in the motors causing a slow, slight drift, especially in the BS and HAM2 oplevs which are zeroed with piezo motors steering a 2" turning mirror). This closes work permit #5606.
| Optical Lever | Old (µrad) | New (µrad) | ||
| Pitch | Yaw | Pitch | Yaw | |
| ETMx | -2.4 | -2.2 | -0.2 | 0.3 |
| ETMy | -1.3 | -6.7 | 0.1 | 0.0 |
| ITMx | -10.2 | -8.2 | -0.2 | 0.0 |
| ITMy | 7.9 | -2.6 | -0.2 | -0.0 |
| PR3 | -1.1 | -2.9 | 0.0 | 0.0 |
| SR3 | 10.1 | -5.7 | 0.0 | 0.2 |
| BS | -13.3 | -9.2 | -0.4 | 0.4 |
| HAM2 | -20.6 | -39.0 | 0.1 | -0.1 |
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