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Title: Design and Implementation of IIR Algorithms for Control of Longitudinal Coupled-Bunch Instabilities

Abstract

The recent installation of third-harmonic RF cavities at the Advanced Light Source has raised instability growth rates, and also caused tune shifts (coherent and incoherent) of more than an octave over the required range of beam currents and energies. The larger growth rates and tune shifts have rendered control by the original bandpass FIR feedback algorithms unreliable. In this paper the authors describe an implementation of an IIR feedback algorithm with more exible response tailoring. A cascade of up to 6 second-order IIR sections (12 poles and 12 zeros) was implemented in the DSPs of the longitudinal feedback system. Filter design has been formulated as an optimization problem and solved using constrained optimization methods. These IIR filters provided 2.4 times the control bandwidth as compared to the original FIR designs. Here the authors demonstrate the performance of the designed filters using transient diagnostic measurements from ALS and DAPNE.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
763766
Report Number(s):
SLAC-PUB-8411
TRN: US0004803
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 16 May 2000
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM BUNCHERS; ADVANCED LIGHT SOURCE; BEAM DYNAMICS; BEAM MONITORING; CONTROL SYSTEMS; DESIGN; PERFORMANCE

Citation Formats

Teytelman, Dmitry. Design and Implementation of IIR Algorithms for Control of Longitudinal Coupled-Bunch Instabilities. United States: N. p., 2000. Web. doi:10.2172/763766.
Teytelman, Dmitry. Design and Implementation of IIR Algorithms for Control of Longitudinal Coupled-Bunch Instabilities. United States. doi:10.2172/763766.
Teytelman, Dmitry. Tue . "Design and Implementation of IIR Algorithms for Control of Longitudinal Coupled-Bunch Instabilities". United States. doi:10.2172/763766. https://www.osti.gov/servlets/purl/763766.
@article{osti_763766,
title = {Design and Implementation of IIR Algorithms for Control of Longitudinal Coupled-Bunch Instabilities},
author = {Teytelman, Dmitry},
abstractNote = {The recent installation of third-harmonic RF cavities at the Advanced Light Source has raised instability growth rates, and also caused tune shifts (coherent and incoherent) of more than an octave over the required range of beam currents and energies. The larger growth rates and tune shifts have rendered control by the original bandpass FIR feedback algorithms unreliable. In this paper the authors describe an implementation of an IIR feedback algorithm with more exible response tailoring. A cascade of up to 6 second-order IIR sections (12 poles and 12 zeros) was implemented in the DSPs of the longitudinal feedback system. Filter design has been formulated as an optimization problem and solved using constrained optimization methods. These IIR filters provided 2.4 times the control bandwidth as compared to the original FIR designs. Here the authors demonstrate the performance of the designed filters using transient diagnostic measurements from ALS and DAPNE.},
doi = {10.2172/763766},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Technical Report:

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