Anomalous Cross-Field Transport of Electrons Driven by the Electron-Ion Hybrid Instability Due to the Velocity Shear in a Magnetized Filamentary Plasma

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The effect of cross-field velocity shear of electrons on the plasma transport has been experimentally investigated in a steadystate filamentary plasma whose effective column radius r_p is smaller than the ion Larmor radius ρ_i and much larger than the electron Larmor radius ρ_e(ρ_e≪r_p<ρ_i>.When the shear frequency ω_s(=υ_0/L_E, where υ_0 is the maximum flow velocity in the sheared flow and L_E is the shear scale length), which is the measure of the strength of the velocity shear, becomes much larger than the lower hybrid frequency, electrostatic plasma fluctuations of the lower hybrid range of frequency are excited in the significantly sheared flow.It is observed that these enhanced fluctuations induce the anomalous, non-ambipolar diffusion of electrons across magnetic field lines.The estimated cross-field diffusion coefficient of electrons obeys the Bohm scaling.The observed instability can be idenified as the electron-ion hybrid shear instability through comparison between experimental and numerically obtained results.
社団法人応用物理学会の論文
2000-08-15