Unipolar currents and electrostatic probe characteristics in a gas discharge plasma

Details Unipolar currents and electrostatic probe characteristics in a gas discharge plasma Unipolar currents and electrostatic probe characteristics in a gas discharge plasma

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jap....54.1289r&link_type=abstract

Journal of Applied Physics (ISSN 0021-8979), vol. 54, March 1983, p. 1289-1292.

Physics

Electrostatic Probes, Gas Discharges, Plasma Currents, Plasma Diagnostics, Plasma Probes, Volt-Ampere Characteristics, Argon Plasma, Electron Emission, Mercury Vapor, Metal Plates, Metal Surfaces, Plasma Cylinders, Plasma Sheaths

Scientific paper

The case is considered in which an electrically floating metal plate is in contact with a steady-state plasma. It is pointed out that the net total current (i.e., electron plus ion) to the plate will be zero. However, current may flow through the metal. The flow of such a current depends on the plasma potential distribution adjacent to the metal and on the uniformity of the electron emission properties of the metal surface. Attention is given to the situation when the neighboring plasma has no potential gradients parallel to the surface. If the metal is not uniform, a unipolar electron current can circulate through the plasma and the metal, with different regions of the same metal plate serving as cathode and anode. A description is given of an experiment in which unipolar currents were measured and compared with values predicted from experimental probe voltage-current characteristics of distinct segments of the unipolar conductor. The plasma examined is the positive column of a low-pressure dc mercury-argon discharge.

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