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Fast digital feedback system for energy and beam position stabilization

By R. Dickson and V. Lebedev

Abstract

A digital fast feedback system for beam energy and position stabilization at the target of the CEBAF accelerator is capable of suppressing beam motion in the frequency band from 0 to 80 Hz and also performs narrow band suppression at the first twelve power line harmonics. The system utilizes two VME computers and runs at a 2.4 kHz sampling rate. The numerical algorithm is based on a recursive digital filter with an additional feedforward loop for suppression of high power line harmonics. The system suppresses beam motion by a factor greater than ten, thus achieving the stabilization of relative beam energy fluctuations to better than 10 {sup {minus}5} and stabilization of beam position on the target to better than 20 {micro}m

Topics: Accelerator, Feedback, Beam, Digital Filters, Cebaf Accelerator, 43 Particle Accelerators, Rf Systems Beam, Computerized Control Systems, Orbit Stability, Digital Systems, Harmonics, Beam Position
Publisher: Thomas Jefferson National Accelerator Facility (U.S.)
Year: 1999
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Provided by: UNT Digital Library
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