Reports until 11:48, Wednesday 28 May 2025
H1 ISC
sheila.dwyer@LIGO.ORG - posted 11:48, Wednesday 28 May 2025 (84630)
phasing REFLAIR 45 changes PRCL loop gain in PRMI

Following up on Jennie's PRCL OLG measurements yesterday, 84604, I checked the phasing of REFLAIR 45 (the MICH sensor) while PRMI was locked. I used a template in userapps/lsc/h1/templates/phase_REFLAIR.xml, but had to turn the PRM excitation down to 300 counts. 

THe first attachment shows that improving this phase improved the shape of the PRCL loop.  This has probably been not phased well for a while, not as a result of the vent. 

I also adjusted the phase of REFLAIR 9, SDFs attached.

 

Images attached to this report