Phys. Rev. Lett. 98, 085002 (2007) [4 pages]Experimental Demonstration of Improved Neoclassical Transport with Quasihelical SymmetryReceived 22 November 2006; published 23 February 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.085002
DOI:
10.1103/PhysRevLett.98.085002
PACS:
52.55.Hc, 52.25.Fi, 52.25.Xz
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