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(EXP1/11) Confinement, Fluctuations, and Electric Fields in the H-1 HELIAC

J. H. Harris, M. G. Shats, B. Blackwell, G. G. Borg, R. W. Boswell, A. D. Cheetham¹, S. A. Dettrick, R. L. Dewar, H. J. Gardner, J. Howard, C. A. Michael, D. Miljak², D. L. Rudakov

Plasma Research Laboratory Australian National University Canberra, ACT 0200 Australia
¹ University of Canberra, ACT 2601 Australia
² University of Sydney, NSW 2006 Australia

Abstract.  Low density discharges produced by RF power of 50-100 kW at low magnetic field in the H-1 heliac are used to study transitions in confinement that are similar to those seen at high power in large devices. Probe diagnostics can be used to make detailed measurements of the profiles of plasma quantities, including the radial electric field. At transition, the density increases by a factor of about two, the density profile steepens, and the ion temperature increases. The transition is accompanied by a decrease in plasma turbulence and changes in the radial electric field.

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