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Title: Radial ion transport measurements in a nonaxisymmetric magnetic mirror

Abstract

Experimental radial ion transport rates and diffusion coefficients are presented for the Constance-B magnetic mirror (Phys. Rev. Lett. {bold 58}, 1853 (1987)). The transport experiments are performed by measuring steady state equilibrium radial profiles of plasma density, ionization source, end loss current, electric field, electron temperature, and ion temperature. A charge coupled device (CCD) camera system (Rev. Sci. Instrum. {bold 60}, 2835 (1989)) is used to measure the two-dimensional radial density, source, and electron temperature profiles. End loss diagnostics including movable Faraday cups, electrostatic end loss analyzers, and an ion time-of-flight analyzer (Rev. Sci. Instrum. {bold 59}, 601 (1988)) are used to measure radial profiles of potential and ion temperature. The ion confinement time perpendicular to the magnetic field is found to be an order of magnitude shorter than predicted by classical and neoclassical transport theories. The radial profiles of the perpendicular diffusion coefficient ({ital D}{sub {perpendicular}}) are presented for hydrogen, helium, and argon plasmas. The coefficients are a factor of 10 larger than the maximum classical and neoclassical coefficients in all three plasmas. Plasma fluctuations resulting from whistler mode microinstability (Phys. Rev. Lett. {bold 59}, 1821 (1987)) as well as nonaxisymmetric potentials are suggested as possible explanations for themore » experimentally measured radial transport rate.« less

Authors:
; ;  [1]
  1. Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, MA (USA)
Publication Date:
OSTI Identifier:
6357357
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (USA)
Additional Journal Information:
Journal Volume: 2:9; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNETIC MIRRORS; PLASMA DIAGNOSTICS; PLASMA; ION DRIFT; DIFFUSION; ECR HEATING; ELECTRON TEMPERATURE; END EFFECTS; EQUILIBRIUM; STEADY-STATE CONDITIONS; HEATING; HIGH-FREQUENCY HEATING; OPEN PLASMA DEVICES; PLASMA HEATING; THERMONUCLEAR DEVICES; 700103* - Fusion Energy- Plasma Research- Kinetics; 700102 - Fusion Energy- Plasma Research- Diagnostics; 700101 - Fusion Energy- Plasma Research- Confinement, Heating, & Production

Citation Formats

Goodman, D L, Petty, C C, and Post, R S. Radial ion transport measurements in a nonaxisymmetric magnetic mirror. United States: N. p., 1990. Web. doi:10.1063/1.859398.
Goodman, D L, Petty, C C, & Post, R S. Radial ion transport measurements in a nonaxisymmetric magnetic mirror. United States. doi:10.1063/1.859398.
Goodman, D L, Petty, C C, and Post, R S. Sat . "Radial ion transport measurements in a nonaxisymmetric magnetic mirror". United States. doi:10.1063/1.859398.
@article{osti_6357357,
title = {Radial ion transport measurements in a nonaxisymmetric magnetic mirror},
author = {Goodman, D L and Petty, C C and Post, R S},
abstractNote = {Experimental radial ion transport rates and diffusion coefficients are presented for the Constance-B magnetic mirror (Phys. Rev. Lett. {bold 58}, 1853 (1987)). The transport experiments are performed by measuring steady state equilibrium radial profiles of plasma density, ionization source, end loss current, electric field, electron temperature, and ion temperature. A charge coupled device (CCD) camera system (Rev. Sci. Instrum. {bold 60}, 2835 (1989)) is used to measure the two-dimensional radial density, source, and electron temperature profiles. End loss diagnostics including movable Faraday cups, electrostatic end loss analyzers, and an ion time-of-flight analyzer (Rev. Sci. Instrum. {bold 59}, 601 (1988)) are used to measure radial profiles of potential and ion temperature. The ion confinement time perpendicular to the magnetic field is found to be an order of magnitude shorter than predicted by classical and neoclassical transport theories. The radial profiles of the perpendicular diffusion coefficient ({ital D}{sub {perpendicular}}) are presented for hydrogen, helium, and argon plasmas. The coefficients are a factor of 10 larger than the maximum classical and neoclassical coefficients in all three plasmas. Plasma fluctuations resulting from whistler mode microinstability (Phys. Rev. Lett. {bold 59}, 1821 (1987)) as well as nonaxisymmetric potentials are suggested as possible explanations for the experimentally measured radial transport rate.},
doi = {10.1063/1.859398},
journal = {Physics of Fluids B; (USA)},
issn = {0899-8221},
number = ,
volume = 2:9,
place = {United States},
year = {1990},
month = {9}
}