Displaying report 1-1 of 1.
Reports until 15:54, Wednesday 11 May 2016
H1 AOS (CDS, ISC)
ross.kennedy@LIGO.ORG - posted 15:54, Wednesday 11 May 2016 (27123)
Testing fixed phase oscillators

Ross, Tega, Dave Barker, Joe Betzwieser, Jeff K

We have been using the new fixed phase oscillators on the h1omcpi and h1susetmxpi models. There was an ititial problem where there was an arbitrary phase mismatch between the two oscillators when viewing the two in a time series  in dtt. This was fixed after we realised that the h1omcpi model had not been restarted after the new oscillators were included. After restarting this model they both now seem to be in phase with each other. We will be using these oscillators for the down/up conversion of the omc dcpd signal with the intention of using it for damping PI modes using the ESD at ETMX. I've included an image of the the dtt timeseries data of the two oscillator outputs where the second has twice the gain of the first. Documentation on the new oscillators can be found here https://dcc.ligo.org/LIGO-T1600143

Images attached to this report
Displaying report 1-1 of 1.