Stewart C. Prager

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We report on results achieved in the MST reversed-field pinch in the following three key areas. In the area of plasma confinement and beta we have achieved improved-confinement plasmas with simultaneously high T e ≈ 2 keV and high T i > 1 keV at MST's highest current capability ∼ 0.5 MA. Both temperatures increase with plasma current. In addition, we have(More)
New profile measurements have allowed the electron thermal diffusivity profile to be estimated from power balance in the Madison Symmetric Torus where magnetic islands overlap and field lines are stochastic. The measurements show that (1) the electron energy transport is conductive not convective, (2) the measured thermal diffusivities are in good agreement(More)
Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck(More)
A concise review of observations of the α dynamo effect in laboratory plasmas is given. Unlike many astrophysical systems, the laboratory pinch plasmas are driven magnetically. When the system is overdriven, the resultant instabilities cause magnetic and flow fields to fluctuate, and their correlation induces electromotive forces along the mean magnetic(More)
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