Analysis of the Negative Characteristic of a Cylindrical Probe in a Magnetic Field

概要

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An analysis is made of the characteristics of a cylindrical probe in a magnetic field, for the voltage region above the plasma space potential. It is assumed in the analysis that the plasma and the sheath are completely separated. The equation for the probe current is numerically solved in a dimentionless form for several values of αξ_p With the sheath thickness as a parameter, where α and ξ_p are the normalized magnetic field and the probe radius, respectively. The probe characteristics are obtained by eliminating the sheath thickness from the probe equation, and the space-charge-limited current in a magnetic field between coaxial cylinders is calculated under the condition that electrons leave the outside cylinder without initial velocity. The negative characteristic is shown to appear when α ≧ 0.5 and α ≧ 0.8, where α = αξ_p/2√<2>.
社団法人日本物理学会の論文
1967-01-05