MD4036: New ADT signal processing for large tune acceptance

Transverse feedback system (ADT) performance can be optimized with digital FIR filters. The current LHC and SPS ADT signal processing schemes consist of Notch and Hilbert filters (total length 8-taps) for removing the closed orbit offsets and correcting the pickup-to-kicker betatron phase advancement. A shorter, 3-tap, filter would allow larger tune acceptance and gain margins. This document summarizes results from the ADT signal processing tests in the LHC (MD4036) and SPS (MD4564) where the performance of different turn-by-turn FIR filters was demonstrated. In addition, the effects of the different filters for the possible operational use and residual beam oscillations are evaluated.