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Reports until 15:53, Friday 21 June 2019
H1 ISC
georgia.mansell@LIGO.ORG - posted 15:53, Friday 21 June 2019 (50116)
Tiny increase in Kappa_c after tuning OMC QPD offsets

In our commissioning window this afternoon I walked the offsets on the two OMC QPDs to try and find a place which gave us better optical gain. I did not end up changing the pitch offsets, however I found a slightly better alignment in yaw, increasing kappa_c by ~0.006. The new offsets were accepted in SDF (first attachment).

The second attachment shows the QPD offsets (first row), Kappa_c and cavity pole (second row) and the BNS range (final row), showing the imporvement in kappa_c after the walk. (Note before we powered up to 37W Kappa_C was sitting around 0.984). Also worth noting is our range has been increasing over the duration of this lock, I'm not sure why.

 

I had originally planned to do the noise budget output jitter measurements in this same commissioning window but ran out of time.

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