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Particle and power balances of hot-filament discharge plasmas in a multidipole device

J. Appl. Phys. 67, 3254 (1990); doi:10.1063/1.345358

Issue Date: 1 April 1990

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M-H. Cho, N. Hershkowitz, and T. Intrator
Nuclear Engineering and Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706-1687
This paper considers particle and power balances to estimate the bulk plasma potential of a hot-filament discharge plasma produced in a multidipole plasma device. The bulk plasma potential dependence on positive dc bias applied to an anode is analyzed, and the predicted characteristics of the plasma potential are compared to the experiment. It is shown that the plasma potential can be more positive or more negative than the anode bias potential. When the potential is more negative, a steady-state potential dip in front of an anode is observed using emissive probes with the zero-emission inflection point method. Conditions for the potential dip formation are discussed. Journal of Applied Physics is copyrighted by The American Institute of Physics.
History: Received 1 September 1989; accepted 6 December 1989
Permalink: http://link.aip.org/link/?JAPIAU/67/3254/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.50.Gj
    The physics of plasmas and electric discharges Plasma production and heating Plasma heating (beam injection, radio-frequency and microwave, ohmic, ICR, ECR)
  • 52.55.Jd
    The physics of plasmas and electric discharges Plasma equilibrium and confinement Magnetic mirrors (including tandem mirrors)
  • YEAR: 1990

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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REFERENCES (8)
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  1. I. Alexeff, W. D. Jones, and K. E. Lonngren, Phys. Rev. Lett. 21, 878 (1968).
  2. K. N. Leung, N. Hershkowitz, and K. R. Mackenzie, Phys. Fluids 19, 1045 (1976);
    3. N. Hershkowitz, K. N. Leung, and T. Romesser, Phys. Rev. Lett. 35, 277 (1975);
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  3. K. N. Leung, T. K. Samec, and A. Lamm, Phys. Lett. 51A, 490 (1975).
  4. C. Chan, T. Intrator, and N. Hershkowitz, Phys. Lett. 91A, 167 (1982).
  5. C. Forest and N. Hershkowitz, J. Appl. Phys. 60, 1295 (1986).
  6. P. C. Stangeby, in Physics of Plasma-Wall Interactions in Controlled Fusion, edited by D. E. Post and R. Behrisch (Plenum, New York, 1986), pp. 41–98.
  7. J. R. Smith, N. Hershkowitz, and P. Coakley, Rev. Sci. Instrum. 50, 210 (1979);
    8. N. Hershkowitz, in Plasma Diagnostics, edited by O. Auciello and D. L. Flamm (Academic, Orlando, FL, 1989).
  8. Handbook of Chemistry and Physics, 66th ed. (CRC, Cleveland, OH, 1985–1986), p. E-365.

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