We turned the MICH/PRCL feed forward parameters in current interferometer.
Related klog is klog24239 and klog24335.
Fig.1. showed the results for the gain tuning for the MICH FF.
blue showed the MICH to DARM transfer function without MICH FF (gain 0)
by changing the MICH FF gain from 1 to 1.5, 1.15 gain would be the better parameter in current MICH FF gain. So we changed the gain factor.
Fig.2. showed the MICH to PRCL coupling.
We compared the TF from MICH to PRCL with and without MICH2 FF control.
As we expected, the actuation efficiency of the BS and PRM would not changed, this MICH2 FF works well, we decided.
Fig.3. showed the TF of the PRCL to DARM with MICH, MICH2 FF.
this is also well subtracted compared from current DARM sensitivity as shown in Fig.4.
