Measurements of radial profiles of He2+ transport coefficients on the TFTR tokamak

E. J. Synakowski, B. C. Stratton, P. C. Efthimion, R. J. Fonck, R. A. Hulse, D. W. Johnson, D. K. Mansfield, H. Park, S. D. Scott, G. Taylor

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Abstract

Measurements of the spatial structure of the transport coefficients of He2+ on the Tokamak Fusion Test Reactor is reported. He2+ profiles were measured using charge-exchange spectroscopy after a helium puff into corotating L-mode plasmas. Modeling shows that the He2+ diffusivity is about 10 m2/s near the plasma edge and drops to below 1 m2/s inside of the q=1 surface. The convective velocity ranges from 13 m/s near q=1 to 2040 m/s near the edge. The helium diffusivity is on the order of the ion momentum and thermal diffusivity and is greater than the electron thermal diffusivity.

Original languageEnglish
Pages (from-to)2255-2258
Number of pages4
JournalPhysical Review Letters
Volume65
Issue number18
DOIs
StatePublished - 1990

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