Transport scaling in the collisionless-detrapping regime in stellarators

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Phys. Fluids; (United States)

OSTI ID:5504467

Crume, Jr, E C; Shaing, K C; Hirshman, S P; van Rij, W I

Stellarator transport scalings with electric field, geometry, and collision frequency in the reactor-relevant collisionless-detrapping regime are determined from numerical solutions of the drift kinetic equation. A new geometrical scaling, proportional to epsilon/sup 3/2//sub t/ rather than epsilon/sub t/epsilon/sup 1/2//sub h/, is found, where epsilon/sub t/ is the inverse aspect ratio and epsilon/sub h/ is the helical ripple. With the new scaling, no reduction in energy confinement time is associated with large helical ripple, which provides design flexibility. Integral expressions for the particle and heat fluxes that are useful for transport simulations are given.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5504467
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 31:1; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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ASPECT RATIO
CLOSED PLASMA DEVICES
COLLISIONAL PLASMA
CONFINEMENT
ELECTRIC FIELDS
EQUATIONS
KINETIC EQUATIONS
NUMERICAL SOLUTION
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PLASMA CONFINEMENT
SCALING LAWS
SIMULATION
STELLARATORS
THERMONUCLEAR DEVICES
TRAPS