cheryl.vorvick@LIGO.ORG - posted 15:37, Friday 22 April 2016 (26739)
changes in IMC alignment from April 4th to April 22:
Changes as measured by OSEM values: last IMC lock before laser work to stable IMC lock today
| April 4th | April 22 | diff (urad) | |
| MC1 p | -27 | -13.5 | +13.5 |
| MC1 y | -1044 | -1036 | +8 |
| MC2 p | 500 | 504 | +4 |
| MC2 y | -688 | -686 | +2 |
| MC3 p | -895 | -895 | 0 |
| MC3 y | -1027 | -1018 | +9 |
| IM4 Trans p | -0.425 | -0.490 | -0.065 |
| IM4 Trans y | 0.103 | 0.081 | -0.022 |
I worked on the IMs (IM1-4) this morning, and have verified that they are aligned to the April 4th values, so cannot account for the change in IM4 Trans.
The alignments of MC1-3 follow the alignment of the IMC input beam, so while the alignment changes for these optics are bigger than what we typically see, after the laser work they are not unexpected.
Images attached to this report
