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Title:
Ion and electron acceleration in the field-reversed configuration with an odd-parity rotating magnetic field
Authors:
Glasser, A. H.; Cohen, S. A.
Affiliation:
AA(Mail Stop K717, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545), AB(Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543)
Publication:
Physics of Plasmas, Volume 9, Issue 5, pp. 2093-2102 (2002). (PhPl Homepage)
Publication Date:
05/2002
Origin:
AIP
PACS Keywords:
Magnetic confinement and equilibrium, Field-reversed configurations rotamaks astrons ion rings magnetized target fusion and cusps, Particle orbit and trajectory
Abstract Copyright:
2002: American Institute of Physics
DOI:
10.1063/1.1459456
Bibliographic Code:
2002PhPl....9.2093G

Abstract

The method for accelerating ions and electrons in the field-reversed configuration using odd-parity rotating magnetic fields (RMFs) in the ion-cyclotron range-of-frequencies (ICRF) is studied. The approach is based on long, accurate numerical integration of Hamilton's equations for single-particle orbits. Rapid ion heating to thermonuclear conditions occurs in <0.1 ms in a modest-sized FRC. Strong variation of the magnetic-field strength over the confinement region prevents a true cyclotron resonance, resulting in stochastic though effective heating. Lyapunov exponents are computed to demonstrate chaotic orbits. Electrons are also effectively heated in this frequency range, primarily by a mechanism involving trapping in the wells of the azimuthal electric field. Odd-parity RMF promotes oppositely directed ion and electron motion near the minor axis, appropriate for supporting the plasma current.
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