Density contraction in a magnetized electronegative gas positive column

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:212769

Matsumoto, M ^[1]

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1. Yamanashi Univ., Kofu (Japan)

The plasma in a magnetized electronegative gas positive column consists of three species of the charged particles, i.e. positive ion, negative ion and electron. Here, gas pressures are assumed of the order of 1 Torr. The strength of the longitudinal magnetic field B is indicated by ratios ({Omega}{sub j}/{nu}{sub j}){sup 2}, where {Omega}{sub j} = q{sub j}B/m{sub j}c, {parallel}{Omega}{sub j}{parallel} being the Larmor frequency and {nu}{sub j} the collision frequency of j-type particle with the neutrals. At present, ({Omega}{sub p}/{nu}{sub p}){sup 2} {approx_equal} ({Omega}{sub n}/{nu}{sub n}){sup 2} = O(10{sup -2}) we consider and {Omega}{sub e}/{nu}{sub e}{sup 2} = O(10{sup 2}). Further, we assume the temperatures T{sub j} are constant at each value of them, and {Tau}{sub e}/{Tau}{sub e} {approx_equal} ({Tau}{sub n}/{Tau}{sub n}/{Tau}{sub e}) {much_gt} 1. Lately, Franklin and co-workers discussed and numerically analyzed the density distributions of charged particles in the electronegative gas positive column, where volume recombination is dominant. We here also investigate the density distributions in a magnetized positive column with negative ions, where ionization, attachment and detachment are considered only. Then, we find that the electron density distribution becomes exactly J{sub o}-distribution at some strength of B as well as the distribution in the inert gas discharge. Further, we show graphically the density contraction of the charged particles as a whole compared to J{sub o}-distribution.

• OSTI ID: 212769
• Report Number(s): CONF-950749--
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ELECTRONEGATIVITY
GLOW DISCHARGES
MAGNETIC FIELDS
MAGNETIZATION
PLASMA DENSITY
WEAKLY IONIZED GASES