[Tanaka, Ushiba]
We engaged dewhitening filters for Type-B tower.
2-stage dewhitening filters are engaged for SR2 and SRM.
1-stage dewhitening filter is engaged for SR2 because SR3 actuators are saturated if engaging 2 stages.
During the work, we found SR3 local control are oscilating (fig1), so it would be necessary to tune the local controls
The reason of SR3 oscillation seems F1 GAS control.
Fgure 1 shows the F1 LVDT signals with nominal gain (blue), -3dB (green), and -6dB from the nominal (red).
Since -3dB and -6dB seems no significant difference, I engaged -3dB at FM7 of F1_DAMP_GAS filter bank.
Then, we can engage 2-stage dewhitening filters for SR3 tower as well as the other Type-B suspensions.
