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The importance of the classical channel in the impurity transport of optimized stellarators
Buller, S.; Mollén, A.; Newton, S. L.; Smith, H. M.; Pusztai, I.
AA(Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden, AB(, AE(Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
Journal of Plasma Physics, Volume 85, Issue 4, id.175850401
Publication Date:
fusion plasma
Abstract Copyright:
2019: Cambridge University Press
Bibliographic Code:


In toroidal magnetic confinement devices, such as tokamaks and stellarators, neoclassical transport is usually an order of magnitude larger than its classical counterpart. However, when a high-collisionality species is present in a stellarator optimized for low Pfirsch-Schlüter current, its classical transport can be comparable to the neoclassical transport. In this letter, we compare neoclassical and classical fluxes and transport coefficients calculated for Wendelstein 7-X (W7-X) and Large Helical Device (LHD) cases. In W7-X, we find that the classical transport of a collisional impurity is comparable to the neoclassical transport for all radii, while it is negligible in the LHD cases, except in the vicinity of radii where the neoclassical transport changes sign. In the LHD case, electrostatic potential variations on the flux surface significantly enhance the neoclassical impurity transport, while the classical transport is largely insensitive to this effect in the cases studied.
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