Parallel viscosity-driven neoclassical fluxes in the banana regime in nonsymmetric toroidal plasmas

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Abstract
Analytic expressions for the parallel viscosity-driven neoclassical fluxes in the banana regime in arbitrary nonsymmetric toroidal plasmas are derived without considering boundary layer effects. They can be evaluated numerically if the Fourier decomposition of the strength of the magnetic field ‖B‖ is known. Since no averaging over the high-frequency component of the Fourier decomposition of ‖B‖ has been employed, these expressions can reproduce all the known results in symmetric systems and predict the possibility of reversing the direction of the bootstrap current and Ware pinch flux in a stellarator.