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Title: Fast feedback system for energy and beam stabilization

Abstract

The electron beams being delivered to targets of the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson National Accelerator Facility (Jefferson Lab) are plagued with undesirable positional and energy fluctuations. These fluctuations primarily occur at harmonics of the power line frequency (60, 120, 180, etc. hertz), and their cause is rooted in electromagnetic fields generated by accelerator electronic equipment. It is possible to largely nullify these deviations by applying real time corrections to electromagnets and RF verniers along the beam line. This concept has been successfully applied at Jefferson Lab by extensively modifying the existing Beam Position Monitor (BPM) system with the integration of an algorithm that computes correction signals targeted at the power line harmonics. Many of the modifications required were due to the existing CEBAF BPM system not having the data acquisition bandwidth needed for this type of feedback system. This paper will describe the techniques required to transform the CEBAF standard BPM system into a high speed practical fast feedback system that coexists with the large scale control system--the Experimental Physics and Industrial Control System (EPICS)--that runs the CEBAF accelerator in daily operation.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
754624
Report Number(s):
DOE/ER/40150-1302; JLAB-ACE-99-10
TRN: US0002403
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: 1999 Particle Accelerator Conference, New York, NY (US), 03/29/1999--04/02/1999; Other Information: PBD: 1 Nov 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CEBAF ACCELERATOR; COMPUTERIZED CONTROL SYSTEMS; BEAM POSITION; BEAM MONITORS; FEEDBACK; REAL TIME SYSTEMS; CORRECTIONS; ORBIT STABILITY; BEAM

Citation Formats

Dickson, R, and Lebedev, V. Fast feedback system for energy and beam stabilization. United States: N. p., 1999. Web.
Dickson, R, & Lebedev, V. Fast feedback system for energy and beam stabilization. United States.
Dickson, R, and Lebedev, V. Mon . "Fast feedback system for energy and beam stabilization". United States. https://www.osti.gov/servlets/purl/754624.
@article{osti_754624,
title = {Fast feedback system for energy and beam stabilization},
author = {Dickson, R and Lebedev, V},
abstractNote = {The electron beams being delivered to targets of the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson National Accelerator Facility (Jefferson Lab) are plagued with undesirable positional and energy fluctuations. These fluctuations primarily occur at harmonics of the power line frequency (60, 120, 180, etc. hertz), and their cause is rooted in electromagnetic fields generated by accelerator electronic equipment. It is possible to largely nullify these deviations by applying real time corrections to electromagnets and RF verniers along the beam line. This concept has been successfully applied at Jefferson Lab by extensively modifying the existing Beam Position Monitor (BPM) system with the integration of an algorithm that computes correction signals targeted at the power line harmonics. Many of the modifications required were due to the existing CEBAF BPM system not having the data acquisition bandwidth needed for this type of feedback system. This paper will describe the techniques required to transform the CEBAF standard BPM system into a high speed practical fast feedback system that coexists with the large scale control system--the Experimental Physics and Industrial Control System (EPICS)--that runs the CEBAF accelerator in daily operation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {11}
}

Conference:
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