Reports until 17:56, Tuesday 13 February 2018
H1 AOS
betsy.weaver@LIGO.ORG - posted 17:56, Tuesday 13 February 2018 (40524)
ETMY Suspension rebiuld status

Travis and Kissel spent the morning measuring violin modes of the new ETMY suspension (Kissel is digesting data).  In the afternoon, Travis and I worked on aligning the reaction chain well enough that it would suspend without mechanical interference.  We paused the round when we got the oplev main reflection beam (2nd beam up due to wedge of ETM16) on the oplev off center by under 100urad in pitch and yaw.  We then realigned all of the top stage tablecloth brackets and install and aligned the top BOSEMs.  After a few more rounds of iterative adjustment and alignment work, we repeated the process on the AOSEMs inside the PenRe mass.  A few quick P and V TFs show that both the main and reaction chains are free, but will recheck tomorrow.  Next up... mine for overnight spectra from tonight in order for Kissel to pre-tune the BRD assemblies that are due to be installed next.