Method of probe diagnostics flows of dense plasma using a flat wall surface probe

Аuthors

Kotel'nikov V. A.^*, Kotelnikov M. V.^*

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: mvk_home@mail.ru

Abstract

Physical, mathematical and numerical models of the problem of a flat wall probe in the shape of oblong rectangular, engulfed by parallel to its surface flow of weakly ionized plasma were developed.

We carried out full-scale computational experiments resulting in obtaining theoretical values of current density versus probe typical size r₀, its potential φ₀, directional velocity of a dense weakly ionized plasma u₀, ions and electrons temperatures ratio ε, parameter D₀, that characterizes orifice gas molar mass.

Non-linear end and edge effects and their impact on probe current density were studied. The studies show that probe current density at reasonably large negative potentials (φ₀ < —40) and probe typical sizes (r₀ > 50) exceeds minimal limit value, practically irrespective of parameters of the problem.

Obtained ion saturation current limit value allows developing an original probe experiment methodology with its further processing. This methodology does not require availability of probe characteristics set, applicable for large probes of any geometric shape (disc, square, rectangle etc.), meant for application with streams of various molar masses. Probe experiment processing is simple and does not require complex computational algorithms application.

The suggested methodology may be useful for probe experiment results processing with GLA, as well as dense weakly ionized plasma jets, flowing out of different purpose plasma jets.

Keywords:

electric probe, probe experiment, flat wall surface probe, continuity equation, Poisson equation, finite effect, edge effect

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