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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