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Abstract

Neoclassical transport coefficients are computed by Monte-Carlo simulation over a wide range of mean free paths in the approximation of small-gyroradius, mono- energetic particle distribution, and vanishing electric field for several stellarator fields. Pfirsch-Schlueter, plateau, and ripple transport coefficients are obtained. The transport coefficients for lambda stellarators in the ripple regime can be described by a single coefficient depending on aspect ratio, rotational transform, and number of periods. There are stellarator configurations in which transport is reduced by a factor of two to four in all three regimes as compared with a tokamak with equal aspect ratio and effective ripple, and by a factor of up to eight as compared with an equivalent lambda stellarator. Transport in actual stellarators and in those being designed is only moderately worse than in the equivalent lambda stellarator.

Additional information

Authors: DOMMASCHK W, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);LOTZ W, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY);NUEHRENBERG J MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: NUCLEAR FUSION, VOL. 24 (1984), NO. 6, PP. 794-799
Record Number: 1989123013200 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en