Author: Rueckelt, T.
Paper Title Page
MOPC29 Realization of Transverse Feedback System for SIS18/100 using FPGA 128
  • T. Rueckelt
    Technische Universität Darmstadt (TU Darmstadt), Signal Processing Group, Darmstadt, Germany
  • M. Alhumaidi, T. Rueckelt, A.M. Zoubir
    TU Darmstadt, Darmstadt, Germany
  Higher beam intensities in particle accelerator are usually prevented by beam instabilities. To cure these instabilities, additional active system must be used besides passive damping. For this purpose, we have developed a distributed low-latency Transverse Feedback System (TFS) using FPGAs. Data acquisition takes place on multiple BPMs with individual FPGAs and ADCs around the accelerator ring. Acquired data is compressed and sent over broadband fiber optic wires to a central unit. For synchronization, data is tagged using timestamps from a reference time, which is distributed by a specially constrained network time protocol to obtain cycle accuracy. The central unit provides an FIR filter for system bandwidth limitation, and an adaptive IIR filter for stable beam signal rejection. Feedback is given using a linear combination of the pre-processed BPM signals. The system provides substantial flexibility, due to the possibility to configure most parameters online. Filters, feedback sources and parameters, compression rate and more can be adapted via Ethernet interface, which also supplies analysis data. First results are shown.  
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