Reports until 18:26, Thursday 25 October 2018
H1 ISC
sheila.dwyer@LIGO.ORG - posted 18:26, Thursday 25 October 2018 (44840)
noise budget plots

Here's an updated version of the noise budget with injections made over the last couple of days.

 

Also attached is a plot of the individual ASC noises, including the soft P injections Hang made from 44800

This noise budget normally relies on the measured cavity pole and optical gain from the Pcal lines, but since they aren't available yet I compared the shot noise estimate to the difference (in quadrature) between the DARM noise and the correlated noise (using the template Geogria updated 44807.  I estimated that kappac = 0.9 at the time of this measurement and the cavity pole is 430 Hz.  (Third attachment)

The other noise traces are up to date, except for the OMC length noise for which I am using the measurement from O2.  

We also measured coupling of HAM1 Hepi excitations to DARM, MICH, SRCL and PRCL.  We will add some plots to the alog tomorrow: there is a contribution of HAM1 X +Y motion to all of these DOFs, but the coupling is not through CHARD.  

 

Images attached to this report