アフタグロー法を用いたアルゴン電離気体中の電子の実効拡散係数の測定

概要

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The electron density-dependence of effective diffusion coefficient D_S for electrons in argon Maxwellianized plasmas has been verified experimentally by means of afterglow technique. A calibrated microwave resonant cavity was used for measuring the electron density. By appending a synchronous detector to a conventional circuit, the sensitivity for the electron density <n_e> averaged over the volume of the discharge tube increased by about three orders of magnitude. Tempora behavior of the electron density between 10^<16> and 2.5×10^<11> m^<-3> at pressures of 46.6 and 66.5 Pa was measured. In order to compare the experimental with theoretical results, <n_e> was transformed into the axial density, by the decay rate of which D_S was determined. The value of D_S was compared with those obtained theoretically by several authors in the range of ratios between 4 and 500 of the characteristic diffusion length Λ of the tube to the shielding length λ_<D0> of electrons. It was found experimentally that diffusion mode changed from ambipolar diffusion to transition modes when Λ/λ_<D0> became smaller than about 100.
前橋工科大学の論文
1998-04-09