aLIGO LHO Logbook

H2 SUS

betsy.weaver@LIGO.ORG - posted 11:09, Thursday 09 February 2012 - last comment - 22:11, Thursday 09 February 2012(2190)

ETMy UIM LR BOSEM fix

Yesterday, we observed the UIM LR BOSEM to be railed.  Today, Filiberto swapped satellite boxes  - no change in the railed signal.  Then he swapped cables - again no change to the railed signal.  So, we swapped the BOSEM which apparently fixed the signal.  The original BOSEM s/n 480 was bad.  We switched in s/n 022 and Kissel reset the OLV offsets.  We then finished aligning it and the rest of the UIM BOSEMs.  All 4 UIM OSEMs are aligned, but with only 1 CAM attaching the BOSEM, due to range issues.

Comments related to this report

betsy.weaver@LIGO.ORG - 22:11, Thursday 09 February 2012 (2198)

Link

Pictures of the UIM BOSEM centering and PUM Flag mounts are on resource space:

https://ligoimages.mit.edu/?c=963

Interestingly, my phone camera picked up the BOSEM LED light - shown as a purple dot on the flags.  A good metric to really "see" centering.  (Now, about that phone bill...)

Look at the "original file name" for a clue as to which one you are looking at.