cheryl.vorvick@LIGO.ORG - posted 13:26, Tuesday 06 September 2016 (29500)
H1 alignment changes in IO optics and in alignment sensors: O1 and post O1
I've collected the alignment changes in the IMC, the IMs (IM1-4), PRM, PR2, RM1, and RM2.
I've also included the senors that see the beams related to these optics, WFSA, WFSB, IM4 Trans, and ISS2 QPD.
WFSA and WFSB are plagued by a mirror in HAM2 that we believe is loose, because the signals ont he WFS jump when there's no indication of IMC mirrors jumping. Because of this feature in the WFS signals, I subtracted out the jumps from the segments of drift, and combined the drift segments to get a total drift over O1.
I've highlighted two sets of numbers:
- red = greater than 100urad change in optic alignment, or a change greater than 0.5 normalized qpd units
- blue = greater than 50urad change in optic alignment (less than 100urad), or a change greater than 0.25 normalized qpd units (less than 0.5 qpd units)
I included RM1 and RM2 since they follow the change of the beam.
Most changed optics:
- IM3 yaw at -111urad
- PR2 yaw at -115urad
Most changed sensor / dof:
- ISS2 yaw at +1.2 normalized qpd units
IMC WFS reflect the O1 input beam change in yaw of +33urad suggested in my alog 29463:
| change in O1 | |
| wfsa p | 0.055 |
| wfsa y | 0.254 |
| wfsb p | 0.210 |
| wfsb y | 0.359 |
Non-image files attached to this report
