Experimental Demonstration of Improved Neoclassical Transport with Quasihelical Symmetry

J. M. Canik, D. T. Anderson, F. S. B. Anderson, K. M. Likin, J. N. Talmadge, and K. Zhai
Phys. Rev. Lett. 98, 085002 – Published 23 February 2007

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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  • Received 22 November 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.085002

©2007 American Physical Society

Authors & Affiliations

J. M. Canik, D. T. Anderson, F. S. B. Anderson, K. M. Likin, J. N. Talmadge, and K. Zhai

  • Department of Electrical and Computer Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, USA

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Issue

Vol. 98, Iss. 8 — 23 February 2007

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