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Title: Radio frequency effects on confinement and equilibrium in a magnetic mirror

Abstract

The effect of radio frequency (rf) power in the ion cyclotron frequency range on radial ion transport and plasma equilibrium for the Constance B magnetic mirror (Phys. Rev. Lett. {bold 58}, 1853 (1987)) is presented. Low-frequency rf power increases the ion perpendicular loss rate, which then becomes the dominant ion loss mechanism. The observed radial transport is much in excess of that calculated by classical, neoclassical, or stochastic wave--particle models, with implications for limits on heating in magnetic mirrors and charge state selection in electron cyclotron resonance ion sources. With sufficient rf power, the ion loss rate rivals the ionization source (plasma production) rate, with a resultant loss of plasma equilibrium. The effect of rf power on the ambipolar potential is also studied, and is shown to be an electron effect whose scaling with applied field is consistent with theory.

Authors:
;  [1]
  1. Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts (USA)
Publication Date:
OSTI Identifier:
5242590
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (United States)
Additional Journal Information:
Journal Volume: 3:11; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNETIC MIRRORS; PLASMA CONFINEMENT; COLD PLASMA; CYCLOTRON FREQUENCY; ELECTRON DENSITY; ELECTRON TEMPERATURE; EQUILIBRIUM PLASMA; FREQUENCY DEPENDENCE; ION CYCLOTRON-RESONANCE; ION SOURCES; ION TEMPERATURE; PLASMA DIAGNOSTICS; RF SYSTEMS; TOKAMAK DEVICES; CLOSED PLASMA DEVICES; CONFINEMENT; CYCLOTRON RESONANCE; OPEN PLASMA DEVICES; PLASMA; RESONANCE; THERMONUCLEAR DEVICES; 700101* - Fusion Energy- Plasma Research- Confinement, Heating, & Production

Citation Formats

Goodman, D L, and Petty, C C. Radio frequency effects on confinement and equilibrium in a magnetic mirror. United States: N. p., 1991. Web. doi:10.1063/1.859794.
Goodman, D L, & Petty, C C. Radio frequency effects on confinement and equilibrium in a magnetic mirror. United States. doi:10.1063/1.859794.
Goodman, D L, and Petty, C C. Fri . "Radio frequency effects on confinement and equilibrium in a magnetic mirror". United States. doi:10.1063/1.859794.
@article{osti_5242590,
title = {Radio frequency effects on confinement and equilibrium in a magnetic mirror},
author = {Goodman, D L and Petty, C C},
abstractNote = {The effect of radio frequency (rf) power in the ion cyclotron frequency range on radial ion transport and plasma equilibrium for the Constance B magnetic mirror (Phys. Rev. Lett. {bold 58}, 1853 (1987)) is presented. Low-frequency rf power increases the ion perpendicular loss rate, which then becomes the dominant ion loss mechanism. The observed radial transport is much in excess of that calculated by classical, neoclassical, or stochastic wave--particle models, with implications for limits on heating in magnetic mirrors and charge state selection in electron cyclotron resonance ion sources. With sufficient rf power, the ion loss rate rivals the ionization source (plasma production) rate, with a resultant loss of plasma equilibrium. The effect of rf power on the ambipolar potential is also studied, and is shown to be an electron effect whose scaling with applied field is consistent with theory.},
doi = {10.1063/1.859794},
journal = {Physics of Fluids B; (United States)},
issn = {0899-8221},
number = ,
volume = 3:11,
place = {United States},
year = {1991},
month = {11}
}