A theory of the positive column constriction in the noble gas discharges at medium pressures |
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Authors: | T. Růžička K. Rohlena |
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Affiliation: | (1) Institute of Physics, Czechosl. Acad. Sci., Prague, Na Slovance 2, 180 40 Praha 8, Czechoslovakia |
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Abstract: | A theory explaining the positive column constriction in terms of a thermal effect is presented. As a consequence of the heating the neutral gas becomes more rarified near the tube axis and a locally increased molecular ion production ensues. If this is balanced by the dissociative (volume) recombination a constriction results at higher currents and pressures. The density profiles and other physical quantities are computed and compared with the available experimental data. All computations are performed for a non-Maxwellian plasma with the electron Coulomb interaction neglected. In contrast to the theories based on an ionization mechanism the thermal theory predicts also a constriction of the density profile. |
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