Spectroscopic Measurements of Ion Temperature in Sheet Plasma and String Plasma

The control of the well-type radial potential profile in a dc plasma by applying bias potential, VE, to the end plate is investigated experimentally. The experimental evidence that a plasma space potential, Φp, increases at the circumference of the plasma with the increase of VE is interpreted qualitatively by the experimental results of the current drawn by the segmented end plate, and of the relationship of Φp to VE. For the dc discharge the value of Φp at the center of the plasma is naturally settled on the value somewhat lower than the anode potential, the electron sheath therefore appears in front of the end plate and expands radially as VE is increased. Electrons are drawn from the circumference of the plasma to the end plate, inducing the nonambipolar radial electron flux. Since the cross-field electron mobility is not sufficiently large, the inwardly directed radial electric field becomes stronger. The role of electron sheath formed is crucial in actively controlling the radial potential profile in the dc plasma.

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Control of the well-type radial potential profile in the magnetized plasma flow produced by a dc discharge

Matsubara

Tonegawa

Shibuya

et al. 2001

Journal of Applied Physics

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Plasma Plugging in Gas Divertor

Matsubara

Kawamura

Morimoto

et al. 1999

Journal of Nuclear Science and Technology

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

Matsubara¹,

Tanikawa

2000

Jpn. J. Appl. Phys.

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The effect of cross-field velocity shear of electrons on the plasma transport has been experimentally investigated in a steady-state filamentary plasma whose effective column radius r p is smaller than the ion Larmor radius ρi and much larger than the electron Larmor radius ρe (ρe≪r p<ρi). When the shear frequency ωS (=v 0/L E, where v 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 identified as the electron-ion hybrid shear instability through comparison between experimental and numerically obtained results.

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Spectroscopic Measurements of Ion Temperature in Sheet Plasma and String Plasma

Cited by 3 publications

References 2 publications

Control of the well-type radial potential profile in the magnetized plasma flow produced by a dc discharge

Control of the well-type radial potential profile in the magnetized plasma flow produced by a dc discharge

Plasma Plugging in Gas Divertor

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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