Turbulent Transport in the Madison Symmetric Torus Reversed-field Pinch

T. D. Rempel, A. F. Almagri, S. Assadi, D. J. Den Hartog, S. A. Hokin, S. C. Prager, J. S. Sarff, W. Shen, K. L. Sidikman, C. W. Spragins, J. C. Sprott, M. R. Stoneking, and E. J. Zita
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
(Received 22 November 1991; accepted 20 February 1992)

ABSTRACT

Measurements of edge turbulence and the associated transport are ongoing in the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] using magnetic and electrostatic probes. Magnetic fluctuations are dominated by m = 1 and n ~ 2R/a, tearing modes. Particle losses induced by magnetic feild fluctuations have been found to be ambipolar (<J_||/B_r>/B₀ = 0). Electrostatic fluctuations are broadband and turbulent, with mode widths Dm ~ 3-7 and Dn ~ 70-50. Particle, parallel current, and energy transport arising from coherent motion with the fluctuating E X B drift have been measured. Particle transport via this channel is comparable to the total particle loss from MST. Energy transport (from <PE_t>/B₀) due to electrostatic fluctuations is relatively small, and jparallel current transport (from <J_||E_t>/B₀) may be small as well.

Ref: T. D. Rempel, A. F. Almagri, S. Assadi, D. J. Den Hartog, S. A. Hokin, S. C. Prager, J. S. Sarff, W. Shen, K. L. Sidikman, C. W. Spragins, J. C. Sprott, M. R. Stoneking, and E. J. Zita, Phys. Fluids B 4, 2136-2141 (1992).

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