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Temperature fluctuations and heat transport in the edge regions of a tokamak

Liewer, P. C. and McChesney, J. M. and Zweben, S. J. and Gould, R. W. (1986) Temperature fluctuations and heat transport in the edge regions of a tokamak. Physics of Fluids, 29 (1). pp. 309-317. ISSN 0031-9171. doi:10.1063/1.865942.

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Electron temperature fluctuations have been investigated in the edge region of the Caltech research tokamak [S. J. Zweben and R. W. Gould, Nucl. Fusion 25, 171 (1985)], and an upper limit to this fluctuation level was found at Te/Te <~ 15%. This measurement, together with previous measurements of density and electric and magnetic field fluctuations, allows a unique comparison of the heat transport resulting from three basic turbulent mechanisms: (1) heat flux from the particle flux resulting from microscopic density and electric field fluctuations; (2) thermal conduction resulting from microscopic temperature and electric field fluctuations; and (3) thermal conduction resulting from microscopic magnetic field fluctuations. The measurements indicate that, in the edge regions, the electron heat transport caused by the measured turbulence-induced particle flux is comparable to or greater than that caused by the thermal conduction associated with the electron temperature and electric field fluctuations, and is significantly greater than that resulting from the measured magnetic fluctuations. This electron heat loss caused by the plasma turbulence is found to be an important electron energy loss mechanism in the edge regions.

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Additional Information:© 1986 American Institute of Physics. Received 22 March 1985; accepted 8 September 1985. One of the authors (P.C.L.) would like to thank Paul Bellan and Wendell Horton for helpful discussions. This work was supported by the Office of Fusion Energy of the U.S. Department of Energy.
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ID Code:10473
Deposited By: Tony Diaz
Deposited On:09 May 2008
Last Modified:19 May 2023 17:10

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