Reports until 01:05, Wednesday 28 May 2014
H1 ISC (ISC)
lisa.barsotti@LIGO.ORG - posted 01:05, Wednesday 28 May 2014 (12106)
Good global alignment not recovered yet

Sheila, Lisa

Previous alignment positions were not saved correctly, apparently, so when the Guardian was restarted today we lost our references.

Daniel had recovered a good green alignment for both arms, but the IR beams where not very well aligned. We tried to look at the PRMI anyway but we realized that it was very misaligned and far from locking. Since a good alignment for IR had not been done in a while, we decided to realign everything from scratch.

Unfortunately we have been tripping SUS/ISIs several times today by engaging ALS DIFF during this alingment process, and as Arnaud reported, we were misaligning the X arm again with every kick..so the whole process took a while.

We leave the X arm with both green and IR aligned; the Y arm is ok fro green, but not for IR.

More alignment tomorrow..

 

On a positive side, we used dither + green WFSs for the X arm several times today, and we could consistently achieve a good alingment for green.