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Title: Confinement of multiply charged ions in an electron cyclotron resonance heated mirror plasma

Abstract

Multiply charged ions are studied in the Constance B quadrupole mirror experiment (Phys. Rev. Lett. {bold 59}, 1821 (1987)) in order to better understand the ion physics of electron cyclotron resonance (ECR) high charge-state ion sources. By measuring the ion densities and end loss fluxes, the parallel confinement times for the first five charge states of oxygen plasmas are determined. The parallel ion confinement times increase with charge state and peak on axis, both indications of an ion-confining potential dip created by the hot electrons. The radial profile of ion end loss is normally hollow, with the peak fluxes occurring at the edge of the ECR zone. An attempt is made to increase the end loss flux of a selected ion species by decreasing its parallel confinement time using minority ion cyclotron resonance heating (ICRH). In addition, an ion model is developed to predict the ion densities, end loss fluxes, and confinement times using the ion particle balance equations, the quasineutrality condition, and theoretical confinement time formulas. The model generally agrees with the experimental data to within experimental error.

Authors:
; ; ;  [1]
  1. Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (US)
Publication Date:
OSTI Identifier:
5862660
DOE Contract Number:  
AC02-78ET51013
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (USA)
Additional Journal Information:
Journal Volume: 3:3; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LOW-BETA PLASMA; ION SOURCES; MAGNETIC MIRRORS; ECR HEATING; CHARGE STATE; END EFFECTS; ION DENSITY; OXYGEN; PARTICLE LOSSES; PLASMA CONFINEMENT; PLASMA DIAGNOSTICS; PLASMA SIMULATION; QUADRUPOLES; CONFINEMENT; ELEMENTS; HEATING; HIGH-FREQUENCY HEATING; MULTIPOLES; NONMETALS; OPEN PLASMA DEVICES; PLASMA; PLASMA HEATING; SIMULATION; THERMONUCLEAR DEVICES; 700102* - Fusion Energy- Plasma Research- Diagnostics; 700101 - Fusion Energy- Plasma Research- Confinement, Heating, & Production

Citation Formats

Petty, C C, Goodman, D L, Smatlak, D L, and Smith, D K. Confinement of multiply charged ions in an electron cyclotron resonance heated mirror plasma. United States: N. p., 1991. Web. doi:10.1063/1.859867.
Petty, C C, Goodman, D L, Smatlak, D L, & Smith, D K. Confinement of multiply charged ions in an electron cyclotron resonance heated mirror plasma. United States. doi:10.1063/1.859867.
Petty, C C, Goodman, D L, Smatlak, D L, and Smith, D K. Fri . "Confinement of multiply charged ions in an electron cyclotron resonance heated mirror plasma". United States. doi:10.1063/1.859867.
@article{osti_5862660,
title = {Confinement of multiply charged ions in an electron cyclotron resonance heated mirror plasma},
author = {Petty, C C and Goodman, D L and Smatlak, D L and Smith, D K},
abstractNote = {Multiply charged ions are studied in the Constance B quadrupole mirror experiment (Phys. Rev. Lett. {bold 59}, 1821 (1987)) in order to better understand the ion physics of electron cyclotron resonance (ECR) high charge-state ion sources. By measuring the ion densities and end loss fluxes, the parallel confinement times for the first five charge states of oxygen plasmas are determined. The parallel ion confinement times increase with charge state and peak on axis, both indications of an ion-confining potential dip created by the hot electrons. The radial profile of ion end loss is normally hollow, with the peak fluxes occurring at the edge of the ECR zone. An attempt is made to increase the end loss flux of a selected ion species by decreasing its parallel confinement time using minority ion cyclotron resonance heating (ICRH). In addition, an ion model is developed to predict the ion densities, end loss fluxes, and confinement times using the ion particle balance equations, the quasineutrality condition, and theoretical confinement time formulas. The model generally agrees with the experimental data to within experimental error.},
doi = {10.1063/1.859867},
journal = {Physics of Fluids B; (USA)},
issn = {0899-8221},
number = ,
volume = 3:3,
place = {United States},
year = {1991},
month = {3}
}