Reports until 17:51, Wednesday 01 August 2018
H1 ISC
sheila.dwyer@LIGO.ORG - posted 17:51, Wednesday 01 August 2018 (43183)
DRMI locked on 3F

Sheila, Jenne, Gabriele, Georgia, Craig, Hang

We locked DRMI on 3F with the arms controlled by ALS.  

The first 3 attachments are the OLGTFs measured with DRMI locked on 1F with the arms, we kept the gains that were in guardian for PRCL and MICH and lowered the SRCL gain by a factor of 2.5 (from -45 to -18). 

We transitioned to 3F with only minor issues (we added a path in the guardian to allow us to skip the DRMI ASC for now).  The next three screenshots are the DRMI 3F OLG measurements, we didn't adjust any of the loop gains.  We did retune the 27I->SRCL input matrix element to cancel a PRCL excitation in the SRCL error signal.  We also added a 27I matrix element to the MICH input matrix to cancel the PRCL excitation in the MICH signal.  (We had previously not used this). 

 

Images attached to this report