Reports until 15:22, Friday 31 January 2014
H1 SUS
betsy.weaver@LIGO.ORG - posted 15:22, Friday 31 January 2014 (9728)
ETMy suspension alignment continues

At COB yesterday we had roughed in the longitudinal, lateral, pitch and yaw positions of the ETMy test mass within the suspension structure.  We had to push the structure ~3mm to achieve this.  Today, while bringing the height into alignment, we threw the yaw out of tolerance (because the height mechanics are grossely coupled to yaw).  After finally getting the height into tolerance (iterate: go up, whoops too far, go down, no up, now down!) we re-tuned yaw to within ~300uRad.  We still need to work on yaw more but our backs were literally breaking getting to these adjustments (see pic) so we opted to stop there and start fresh on Monday.  We now have the long, lat, and height within spec with the pitch and yaw almost in spec for the main chain.  We also adjusted some bad roll on the reaction ERM which for some reason induced pitch.  We'll attack that chain Monday.  IAS plans to bring the gap measuring aparatus out on Monday which we'll need to use soon.

Images attached to this report