Jenne Driggers, Sheila, Keita, Camilla, Jennie Wright, Rahul

We are searching for PRX flashes to use for the POP path work in HAM1.  

We are using a DRMI locked time from March 14th (1:30-2 UTC) as a reference.  Since that time HAM2 hepi has been locked, causing a +3.7urad shift in RZ, which means that PR3 and PRM osems need to be -3.7urad yawed compared to how they where before HEPI was locked to reproduce the alignment (this shift is small compared to the misalignments that we are looking for).  

While trying to restore to this reference time, we see that restoring ITMX sliders restults in optical levers similar to the reference time, and PRM sliders results in PRM osems similar to the reference times.  However, restoring PR3 sliders to the reference time gives top mass osem pitch -20 urad in pitch, and PR2 sliders restored gives a +30 urad shift according to the top mass osems.  

HAM2 CPS RY shows a +1.3 urad shift at the same time as the PR3 osem shift show -24urad (these are opposite directions), HEPI shows -1.5urad RY, at 11 am pacific time Friday, there is no change in the DAC drive at this time.  

PR2's shift seems to have happened right after the DACKill from Friday.  Ibrahim and Oli are running top mass to top mass TFs for health checks on both of those.  

Keita walked aligments to get PRX flashes back.  In the end, PRM and ITMX are back to where they were when DRMI was locked March 14th, as well as PR3 yaw.  PR3 pitch osem is back to where it was on the 14th, but the slider is +11urad.  PR2 pitch slider is -47urad, osem says -29 urad, yaw +45 slider, +55 urad osems.  

We dedicded it was time to move on with the in chamber work, because while these alignment shifts are strange, they probably can't explain the misalingment between the in air and the in vacuum pop paths.