Last week:
- we designed and installed new high blends in all 12 directions of the the BSC-ISI, in order to reduce low frequency gain peaking (both units)
- we designed and installed a .250Hz low blend in the longitudinal direction (Y) (both units)
this provided interesting improvement as reported in the last cavity measurement.

However,the measured isolation was not as good as expected (it did not follow the low blend as it should).

The problem seems to be in the blend filter conversion to the foton format: The low blend filters first coefficients are small and rounded.

The plot attached show the improvement after fixing the low blend in BSC8:
- Red curve is the reference (Stage 1 Damped)
- Blue Curve is Stage 1 Controlled, with rounded coefficients
- Green Curve is Stage 1 Controlled, with better filter coefficients

We'll work tomorrow on a solution to prevent this from happening again.

I leave both units up and running for Bram to possibly run cavity measurements.