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Title: Electron current extraction from a permanent magnet waveguide plasma cathode

Abstract

An electron cyclotron resonance plasma produced in a cylindrical waveguide with external permanent magnets was investigated as a possible plasma cathode electron source. The configuration is desirable in that it eliminates the need for a physical antenna inserted into the plasma, the erosion of which limits operating lifetime. Plasma bulk density was found to be overdense in the source. Extraction currents over 4 A were achieved with the device. Measurements of extracted electron currents were similar to calculated currents, which were estimated using Langmuir probe measurements at the plasma cathode orifice and along the length of the external plume. The influence of facility effects and trace ionization in the anode-cathode gap are also discussed.

Authors:
;  [1];  [2]
  1. University of Michigan, Ann Arbor, Michigan 48109 (United States)
  2. NASA Glenn Research Center, Cleveland, Ohio 44135 (United States)
Publication Date:
OSTI Identifier:
22063716
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 82; Journal Issue: 9; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; BEAM CURRENTS; CATHODES; CYLINDRICAL CONFIGURATION; ELECTRON CYCLOTRON-RESONANCE; ELECTRON SOURCES; IONIZATION; LANGMUIR PROBE; PERMANENT MAGNETS; PLASMA; PLASMA DENSITY; PLUMES; WAVEGUIDES

Citation Formats

Weatherford, B. R., Foster, J. E., and Kamhawi, H. Electron current extraction from a permanent magnet waveguide plasma cathode. United States: N. p., 2011. Web. doi:10.1063/1.3642662.
Weatherford, B. R., Foster, J. E., & Kamhawi, H. Electron current extraction from a permanent magnet waveguide plasma cathode. United States. doi:10.1063/1.3642662.
Weatherford, B. R., Foster, J. E., and Kamhawi, H. Thu . "Electron current extraction from a permanent magnet waveguide plasma cathode". United States. doi:10.1063/1.3642662.
@article{osti_22063716,
title = {Electron current extraction from a permanent magnet waveguide plasma cathode},
author = {Weatherford, B. R. and Foster, J. E. and Kamhawi, H.},
abstractNote = {An electron cyclotron resonance plasma produced in a cylindrical waveguide with external permanent magnets was investigated as a possible plasma cathode electron source. The configuration is desirable in that it eliminates the need for a physical antenna inserted into the plasma, the erosion of which limits operating lifetime. Plasma bulk density was found to be overdense in the source. Extraction currents over 4 A were achieved with the device. Measurements of extracted electron currents were similar to calculated currents, which were estimated using Langmuir probe measurements at the plasma cathode orifice and along the length of the external plume. The influence of facility effects and trace ionization in the anode-cathode gap are also discussed.},
doi = {10.1063/1.3642662},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 9,
volume = 82,
place = {United States},
year = {2011},
month = {9}
}