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Single-helicity states in compressible magnetohydrodynamics simulations of the reversed-field pinch with nonuniform resistivity
Autori Autori: Onofri M.
Rivista Rivista: Nuclear Fusion
    Volume n°: 51 - ISSUE 11 Anno: 2011
Abstract Abstract: Using a magnetohydrodynamics numerical code that includes the description of density and pressure evolution and anisotropic thermal conductivity, it is shown that single-helicity states in the reversed-field pinch (RFP) configuration are obtained when the resistivity has a radial profile sharply increasing close to the wall. In contrast, a uniform resistivity produces multiple-helicity states. A radially increasing resistivity profile is determined in RFP experiments by the temperature difference between the plasma core and the wall. The results of the simulations presented in this letter are an indication that quasi-single-helicity states observed in experiments with high toroidal currents may be a consequence of the resistivity profile determined by the high temperatures reached in the plasma core in high-current discharges.Parola chiave Parola chiave: Plasma physics
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