Effect of collisionless detrapping on nonaxisymmetric transport in a stellarator with radial electric field

Journal Article · Thu Sep 01 04:00:00 EDT 1983 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864452· OSTI ID:5732996

Mynick, H E

A derivation is given for expressions describing transport rates in a stellarator operating at low collisionality ..nu.., in the presence of a radial electric field. It is shown that collisionless detrapping (and retrapping) of particles in superbanana orbits can substantially modify this transport. The detrapping provides a collisionless lower bound on the width of the collisional boundary layer which, in previous work, gave rise to transport coefficients scaling as ..nu../sup 1/2/. With this lower bound, these coefficients will instead scale as ..nu.., implying more favorable confinement than indicated by the ..nu../sup 1/2/ result commonly employed.

• Research Organization: Torsatron/Stellarator Laboratory, University of Wisconsin, Madison, Wisconsin 53706
• DOE Contract Number: AC02-78ET53082
• OSTI ID: 5732996
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 26:9; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
COLLISIONAL PLASMA
COLLISIONLESS PLASMA
CONFINEMENT
ELECTRIC FIELDS
LAYERS
MODIFICATIONS
OPERATION
ORBITS
PLASMA
PLASMA CONFINEMENT
STELLARATORS
THERMONUCLEAR DEVICES
TRANSPORT THEORY
TRAPPING