Transport scaling in the collisionless-detrapping regime in stellarators

Technical Report · Tue Sep 01 04:00:00 EDT 1987

DOI:https://doi.org/10.2172/5957039· OSTI ID:5957039

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/sub t/sup 3/2/ rather than epsilon/sub t/epsilon/sub h/sup 1/2/, 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. 11 refs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5957039
• Report Number(s): ORNL/TM-10574; ON: DE88001511
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700103* -- Fusion Energy-- Plasma Research-- Kinetics
ASPECT RATIO
ATF TORSATRON
CLOSED PLASMA DEVICES
COLLISIONLESS PLASMA
DIFFUSION
ELECTRIC FIELDS
EQUATIONS
HEAT FLUX
KINETIC EQUATIONS
MAGNETIC FIELDS
NUMERICAL SOLUTION
PLASMA
PLASMA DRIFT
SCALING LAWS
STELLARATORS
THERMONUCLEAR DEVICES
THREE-DIMENSIONAL CALCULATIONS
TORSATRON STELLARATOR
TRANSPORT THEORY