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Title:
Experimental Demonstration of Improved Neoclassical Transport with Quasihelical Symmetry
Authors:
Canik, J. M.; Anderson, D. T.; Anderson, F. S. B.; Likin, K. M.; Talmadge, J. N.; Zhai, K.
Affiliation:
AA(Department of Electrical and Computer Engineering, University of Wisconsin - Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA), AB(Department of Electrical and Computer Engineering, University of Wisconsin - Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA), AC(Department of Electrical and Computer Engineering, University of Wisconsin - Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA), AD(Department of Electrical and Computer Engineering, University of Wisconsin - Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA), AE(Department of Electrical and Computer Engineering, University of Wisconsin - Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA), AF(Department of Electrical and Computer Engineering, University of Wisconsin - Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA)
Publication:
Physical Review Letters, vol. 98, Issue 8, id. 085002 (PhRvL Homepage)
Publication Date:
02/2007
Origin:
APS
PACS Keywords:
Stellarators torsatrons heliacs bumpy tori and other toroidal confinement devices, Transport properties, Magnetized plasmas
DOI:
10.1103/PhysRevLett.98.085002
Bibliographic Code:
2007PhRvL..98h5002C

Abstract

Differences in the electron particle and thermal transport are reported between plasmas produced in a quasihelically symmetric (QHS) magnetic field and a configuration with the symmetry broken. The thermal diffusivity is reduced in the QHS configuration, resulting in higher electron temperatures than in the nonsymmetric configuration for a fixed power input. The density profile in QHS plasmas is centrally peaked, and in the nonsymmetric configuration the core density profile is hollow. The hollow profile is due to neoclassical thermodiffusion, which is reduced in the QHS configuration.
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