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Uniform current density and divergence control in high power extraction ion diodes

Abstract

A theory of radial beam uniformity in extraction ion diodes is presented. The theory is based on a locally one-dimensional analysis of the diamagnetic compression of magnetic streamlines and the self-consistent determination of the virtual cathode location. The radial dependence of the applied magnetic field is used to determine the critical parameters of this locally one-dimensional treatment. The theory has been incorporated into the ATHETA magnetic field code to allow the rapid evaluation of realistic magnetic field configurations. Comparisons between the theoretical results, simulations with the QUICKSILVER code, and experiments on the PBFA-X accelerator establish the usefulness of this tool for tuning magnetic fields to improve ion beam uniformity. The consequences of poor beam uniformity on the evolution of ion diode instabilities are discussed with supporting evidence from simulations, theory, and experiments. (author). 8 figs., 15 refs.
Authors:
Desjarlais, M P; Coats, R S; Lockner, T R; Pointon, T D; Johnson, D J; Slutz, S A; Lemke, R W; Cuneo, M E; Mehlhorn, T A [1] 
  1. Sandia Labs., Albuquerque, NM (United States)
Publication Date:
Dec 31, 1996
Product Type:
Conference
Report Number:
INIS-CZ-0002; CONF-960610-
Reference Number:
SCA: 700411; PA: AIX-28:056088; EDB-97:114632; SN: 97001835067
Resource Relation:
Conference: BEAMS `96: 11. international conference on high-power particle beams, Prague (Czech Republic), 10-14 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Beams `96. Proceedings of the 11th international conference on high power particle beams. Vol. I; Jungwirth, K.; Ullschmied, J. [eds.]; PB: [684] p.
Subject:
70 PLASMA PHYSICS AND FUSION; ION BEAMS; BEAM EXTRACTION; FOCUSING; PLASMA MICROINSTABILITIES; PLASMA SIMULATION; BEAM DYNAMICS; BEAM PRODUCTION; CURRENT DENSITY; M CODES; MAGNETIC FIELDS; PARTICLE BEAM FUSION ACCELERATOR; Q CODES
OSTI ID:
511280
Research Organizations:
Ceskoslovenska Akademie Ved, Prague (Czech Republic). Ustav Fyziky Plazmatu
Country of Origin:
Czech Republic
Language:
English
Other Identifying Numbers:
Other: ON: DE97637662; ISBN 80-902250-3-9; TRN: CZ9726695056088
Availability:
INIS; OSTI as DE97637662
Submitting Site:
INIS
Size:
pp. 101-110
Announcement Date:
Sep 04, 1997

Citation Formats

Desjarlais, M P, Coats, R S, Lockner, T R, Pointon, T D, Johnson, D J, Slutz, S A, Lemke, R W, Cuneo, M E, and Mehlhorn, T A. Uniform current density and divergence control in high power extraction ion diodes. Czech Republic: N. p., 1996. Web.
Desjarlais, M P, Coats, R S, Lockner, T R, Pointon, T D, Johnson, D J, Slutz, S A, Lemke, R W, Cuneo, M E, & Mehlhorn, T A. Uniform current density and divergence control in high power extraction ion diodes. Czech Republic.
Desjarlais, M P, Coats, R S, Lockner, T R, Pointon, T D, Johnson, D J, Slutz, S A, Lemke, R W, Cuneo, M E, and Mehlhorn, T A. 1996. "Uniform current density and divergence control in high power extraction ion diodes." Czech Republic.
@misc{etde_511280,
title = {Uniform current density and divergence control in high power extraction ion diodes}
author = {Desjarlais, M P, Coats, R S, Lockner, T R, Pointon, T D, Johnson, D J, Slutz, S A, Lemke, R W, Cuneo, M E, and Mehlhorn, T A}
abstractNote = {A theory of radial beam uniformity in extraction ion diodes is presented. The theory is based on a locally one-dimensional analysis of the diamagnetic compression of magnetic streamlines and the self-consistent determination of the virtual cathode location. The radial dependence of the applied magnetic field is used to determine the critical parameters of this locally one-dimensional treatment. The theory has been incorporated into the ATHETA magnetic field code to allow the rapid evaluation of realistic magnetic field configurations. Comparisons between the theoretical results, simulations with the QUICKSILVER code, and experiments on the PBFA-X accelerator establish the usefulness of this tool for tuning magnetic fields to improve ion beam uniformity. The consequences of poor beam uniformity on the evolution of ion diode instabilities are discussed with supporting evidence from simulations, theory, and experiments. (author). 8 figs., 15 refs.}
place = {Czech Republic}
year = {1996}
month = {Dec}
}