cheryl.vorvick@LIGO.ORG - posted 00:28, Friday 05 April 2019 (48185)
IM alignment jump in IM1, IM2, and IM3, on Feb. 12, 2019
There was an event on Feb. 12, starting just after 19:31 UTC, that strongly shook the IMs in HAM2, and caused ISI and optics in HAM2 to trip, and caused alignment shifts in the IMs. Plots attached show length, pitch, and yaw signals, and OSEM OUT signals, along with guardian states of each IM and HAM2 HEPI and ISI.
| optic dof | change |
| im1 length | 0.8um |
| im1 pitch | -81.2urad |
| im1 yaw | -12.1urad |
| im2 length | -0.5um |
| im2 pitch | 48.2urad |
| im2 yaw | 6.4urad |
| im3 length | -0.2um |
| im3 pitch | 56.8urad |
| im3 yaw | -11.1urad |
Adding this to FRS Ticket 4698.
Images attached to this report
