Reduced particle and heat transport with quasisymmetry in the Helically Symmetric Experiment

J. M. Canik; D. T. Anderson; F. S.B. Anderson; C. Clark; K. M. Likin; J. N. Talmadge; K. Zhai

doi:10.1063/1.2709862

Reduced particle and heat transport with quasisymmetry in the Helically Symmetric Experiment

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

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Abstract

Measurements of particle and heat transport have been made in the Helically Symmetric Experiment [F. S. B. Anderson, Fusion Technology 27, 273 (1995)]. Experimental differences in the density and temperature profiles are reported between plasmas produced in a quasihelically symmetric (QHS) magnetic field and a configuration with the symmetry broken. The electron temperature is higher in the QHS configuration, due to a reduction in electron thermal diffusivity that is comparable to the neoclassical prediction. The density profile in plasmas with the symmetry broken is measured to be hollow, while in QHS plasmas the profile is centrally peaked. Calculations of the radial particle flux using the DEGAS code [D. Heifetz, J. Comput. Phys. 46, 309 (1982)] show that the hollow profile observed with the symmetry broken is due to neoclassical thermodiffusion. Thermodiffusion is reduced in the QHS configuration, resulting in a peaked density profile.

Original language	English
Article number	056107
Journal	Physics of Plasmas
Volume	14
Issue number	5
DOIs	https://doi.org/10.1063/1.2709862
State	Published - 2007
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy under Contract No. DE-FG02-93ER54222.

Funders	Funder number
U.S. Department of Energy	DE-FG02-93ER54222

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10.1063/1.2709862

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abstract = "Measurements of particle and heat transport have been made in the Helically Symmetric Experiment [F. S. B. Anderson, Fusion Technology 27, 273 (1995)]. Experimental differences in the density and temperature profiles are reported between plasmas produced in a quasihelically symmetric (QHS) magnetic field and a configuration with the symmetry broken. The electron temperature is higher in the QHS configuration, due to a reduction in electron thermal diffusivity that is comparable to the neoclassical prediction. The density profile in plasmas with the symmetry broken is measured to be hollow, while in QHS plasmas the profile is centrally peaked. Calculations of the radial particle flux using the DEGAS code [D. Heifetz, J. Comput. Phys. 46, 309 (1982)] show that the hollow profile observed with the symmetry broken is due to neoclassical thermodiffusion. Thermodiffusion is reduced in the QHS configuration, resulting in a peaked density profile.",

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AU - Clark, C.

AU - Likin, K. M.

AU - Talmadge, J. N.

AU - Zhai, K.

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Reduced particle and heat transport with quasisymmetry in the Helically Symmetric Experiment

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