Effects of plasma turbulence on electron collection by a high-voltage spherical probe in a magnetized plasma

Details Effects of plasma turbulence on electron collection by a high-voltage spherical probe in a magnetized plasma Effects of plasma turbulence on electron collection by a high-voltage spherical probe in a magnetized plasma

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6493p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A5, May 1, 1992, p. 6493-6504. Research supported by DNA.

Physics

2

Electrons, Magnetic Effects, Plasma Turbulence, Trapped Particles, Turbulence Effects, Electron Density (Concentration), Electron Scattering, Magnetohydrodynamic Stability, Plasma Sheaths, Plasma Waves, Volt-Ampere Characteristics

Scientific paper

The effects of electron trapping and plasma turbulence on the current-voltage relation for a positively charged high-voltage spherical probe in a magnetized plasma are studied. When the neutral density is low enough so that ionization can be ignored, the present results indicate that the sheath structure and the current-voltage relation of a charged sphere configured as the originally planned SPEAR I experiment would be substantially influenced by the combined action of trapped electrons and plasma instabilities. Reduced levels of current collection relative to Linson's (1969) model are found. Variation of the scattering parameter over the whole range of physically realizable values results in a range of predicted current collection values which is a small fraction of the interval between the Parker-Murphy and Langmuir-Blodgett limits.

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