Correlation between Ion and Electron Probe Currents in a Turbulent Plasma Flow

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Abstract
An experimental investigation for the justification of using the electrostatic probes for turbulent plasma diagnostics is discussed. The object is to find how faithfully the probe current fluctuations follow the electron density fluctuations, since in general it is a function of other parameters such as temperature, plasma potential, flow velocity, and gas pressure. The procedure adopted is to study the instantaneous correlation between probes which are close to each other operating in three different modes (single ion probe, single electron probe, and double probe). The probe currents in these three modes will all have the electron density multiplied by expressions differently dependent on other parameters. Excellent instantaneous correlation observed is a persuasive indication that the probe current fluctuation is indeed a measure of the electron density fluctuation. An instantaneous correlation between an ion probe and the floating potential of another probe shows hard diode-type characteristics, the true significance of which is not fully understood.

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