Elenna, Gabriele

We measured the necessary transfer functions to retune the LSC feed-forward for MICH and SRCL. As usual, we turned off both MICH and SRCL FF paths, measured and fitted the transfer functions.

It turns out that the optimal MICH transfer function changes when the SRCL FF is on or off. So in the current situation we have a new SRCL FF (that improves things) and we are runningn with the old MICH FF (which is better than the new fit).

We did another MICH measurement with the SRCL FF on, and found that the optimal transfer function is indeed different from whta we measured with the SRCL FF off, and closer to the old MICH FF above 20 Hz, We have fitted the new transfer function and have a a new filter ready to go.

All changes have been accepted in SDF and guardian has been updated