We tried to prepare for installing the SRM BPC.
Initial alignment Xarm, Yarm, OMC, then the DRMI trial, but DRMI was unstable(15 s).
So I performed the SRY alignment for SRM, but still unstable.
We tweaked the SRM to be stable state, and when we started SRM ADS, it worked well.
For DRMI with IMMT2, PRM, SRM ADS, we can continued the lock more than 1 hour.
After the initial alignment, I tried to prepare the BPC for SRM.
As a temporal situation, I set the
SRM frequency pitch 70 Hz, 300 count
SRM frequency yaw 75 Hz, 100 cnt
Fig.1. showed the spectrum of the AS34I and SRCL error signal with oscillation.
I also performed the phasing of the oscillator
pitch -68.9 deg. (Fig.2.)
yaw -80.9 Hz (Fig.3.)
But I cannot perform the connection from SRM INF to SR3 OUTF, we need to check the model and matrix
I forgot to describe the gain of the SRM ADS,
when I changed the INF gain from 300 to 30 for both pitch and yaw, increasing the stability (Fig.5.)
One reason for BPC INF to OUTF is the switch of BPC output.
And we noticed that the matrix was shifted for input part, so Ikeda-san fixed it.
I confirm all matrix was working well.