Fast Electronics for the Dafne Transverse Feedback Systems

TL;DR

This paper describes the design and implementation of fast digital electronics for transverse feedback systems at DAFNE, enabling real-time bunch-by-bunch correction of beam instabilities with high-speed digital sampling and flexible output control.

Contribution

It introduces a novel digital signal processing system with high-speed sampling and flexible output management for beam stability control at DAFNE.

Findings

Successful real-time bunch-by-bunch correction implemented

High-speed digital sampling at 368 MHz achieved

System capable of flexible output control for beam stabilization

Abstract

Transverse feedback systems for controlling the vertical coupled-bunch instabilities in the positron and electron main rings are installed at DAFNE. They started to be operative respectively from June and September 2000. For the horizontal plane, similar systems have been installed in summer 2001 with less kicker power. Design specifications and the basic system concepts are presented. Real time bunch-by-bunch offset correction is implemented using digital signal processors and dual-port RAM's. Fast analog to digital sampling is performed at the maximum bunch frequency (368 MHz). The system manages at full speed a continuous flow of 8-bits data and it has the capability to invert the sign or put to zero the output for any combination of bunches. A conversion from digital to analog produces the output correcting signal.