Formation of a velocity shear layer in confined plasmas

It is shown, by allowing for finite momentum loss, that an E×B velocity shear layer forms naturally from the radial potential profile created at the boundary or scrape‐off region of a confined plasma where magnetic field lines come into contact with material surfaces. The loss of perpendicular momen...

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Bibliographic Details
Published in:Physics of fluids. B, Plasma physics Plasma physics, 1992-12, Vol.4 (12), p.4057-4061
Main Author: Tsui, H. Y. W.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 - Plasma Confinement- (1992-)
700350 - Plasma Production, Heating, Current Drive, & Interactions- (1992-)
CLOSED PLASMA DEVICES
CONFINEMENT
Exact sciences and technology
LAYERS
LINEAR MOMENTUM
Magnetic confinement and equilibrium
MECHANICAL PROPERTIES
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
PLASMA CONFINEMENT
SHEAR PROPERTIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VELOCITY
WALL EFFECTS
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Summary:It is shown, by allowing for finite momentum loss, that an E×B velocity shear layer forms naturally from the radial potential profile created at the boundary or scrape‐off region of a confined plasma where magnetic field lines come into contact with material surfaces. The loss of perpendicular momentum governs the structure of the velocity shear in the scrape‐off layer via the generation of a radial current that modifies the potential profile. Increase in velocity shear is coupled to improvement in momentum confinement.
ISSN:0899-8221
2163-503X
DOI:10.1063/1.860312