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Title: Physics of a magnetic filter for negative ion sources. I. Collisional transport across the filter in an ideal, 1D filter

Abstract

Magnetic filters are used in negative ion sources for neutral beam injection in fusion devices to reduce the electron temperature in the extraction region in order to limit negative ion destruction by fast electrons. The drop in electron temperature through the filter is due to the enhanced residence time and collisional energy losses of electrons trapped in the magnetic field. The mechanisms controlling particle and energy transport through the magnetic filter in negative ion sources of the ITER type are still not clear and the aim of this paper is to clarify and quantify these mechanisms. A particle-in-cell Monte Carlo simulation is used to revisit and analyze the role and operation of the magnetic filter in an 'ideal' one-dimensional configuration and to study the stability of the one-dimensional solution in a two-dimensional configuration with periodic boundary conditions. The roles of collisions and instabilities on electron transport through the filter are discussed. The influence of a more realistic geometry on electron transport through the filter is analyzed in the companion paper [Boeuf et al., Phys. Plasmas 19, 113510 (2012)].

Authors:
; ;  [1]
  1. LAboratoire PLAsma et Conversion d'Energie (LAPLACE), Universite de Toulouse, Bt. 3R2, 118 Route de Narbonne, F-31062 Toulouse Cedex 9 (France)
Publication Date:
OSTI Identifier:
22068932
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANIONS; BEAM INJECTION; BOUNDARY CONDITIONS; CHARGED-PARTICLE TRANSPORT; COLLISIONS; COMPUTERIZED SIMULATION; ELECTRON TEMPERATURE; ION SOURCES; ITER TOKAMAK; MAGNETIC FIELDS; MAGNETIC FILTERS; MATHEMATICAL SOLUTIONS; MONTE CARLO METHOD; ONE-DIMENSIONAL CALCULATIONS; TRAPPED ELECTRONS

Citation Formats

Boeuf, J. P., Chaudhury, B., and Garrigues, L. Physics of a magnetic filter for negative ion sources. I. Collisional transport across the filter in an ideal, 1D filter. United States: N. p., 2012. Web. doi:10.1063/1.4768676.
Boeuf, J. P., Chaudhury, B., & Garrigues, L. Physics of a magnetic filter for negative ion sources. I. Collisional transport across the filter in an ideal, 1D filter. United States. doi:10.1063/1.4768676.
Boeuf, J. P., Chaudhury, B., and Garrigues, L. Thu . "Physics of a magnetic filter for negative ion sources. I. Collisional transport across the filter in an ideal, 1D filter". United States. doi:10.1063/1.4768676.
@article{osti_22068932,
title = {Physics of a magnetic filter for negative ion sources. I. Collisional transport across the filter in an ideal, 1D filter},
author = {Boeuf, J. P. and Chaudhury, B. and Garrigues, L.},
abstractNote = {Magnetic filters are used in negative ion sources for neutral beam injection in fusion devices to reduce the electron temperature in the extraction region in order to limit negative ion destruction by fast electrons. The drop in electron temperature through the filter is due to the enhanced residence time and collisional energy losses of electrons trapped in the magnetic field. The mechanisms controlling particle and energy transport through the magnetic filter in negative ion sources of the ITER type are still not clear and the aim of this paper is to clarify and quantify these mechanisms. A particle-in-cell Monte Carlo simulation is used to revisit and analyze the role and operation of the magnetic filter in an 'ideal' one-dimensional configuration and to study the stability of the one-dimensional solution in a two-dimensional configuration with periodic boundary conditions. The roles of collisions and instabilities on electron transport through the filter are discussed. The influence of a more realistic geometry on electron transport through the filter is analyzed in the companion paper [Boeuf et al., Phys. Plasmas 19, 113510 (2012)].},
doi = {10.1063/1.4768676},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 19,
place = {United States},
year = {2012},
month = {11}
}