Year 2004 Series

Dust as a Diagnostic Tool to Measure Potential Distribution

Presenter: Alex Samarian
Date: July
Keywords: Plasma, Sheath, Diagnostics, Dust, Charge, Supra-Thermal, Electrons, Electric, Field

Descriptions: It was shown that micrometer sized particles can be used as a reliable diagnostic tool for sheath analysis. The parabolic sheath approximation is valid for our operating range. Particle charge approximation using the plasma floating potential if the particle is levitated close to the bulk plasma. In order to determine the sheath structure accurately, the existence of supra-thermal electrons must be accounted for. The development of a plasma monitor tool using the particle levitation height as the prime measurement is viable. The sheath can be used to differentiate powders of various sizes and densities.

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