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Global effects on neoclassical transport in the pedestal with impurities

István Pusztai (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Stefan Buller (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Matt Landreman
Plasma Physics and Controlled Fusion (0741-3335). Vol. 58 (2016), 8, p. 085001.
[Artikel, refereegranskad vetenskaplig]

We present a numerical study of collisional transport in a tokamak pedestal in the presence of non-trace impurities, using the radially global delta-f neoclassical solver PERFECT [M. Landreman et al. 2014 Plasma Phys. Control. Fusion 56 045005]. It is known that in a tokamak core with non-trace impurities present the radial impurity flux opposes the bulk ion flux to provide an ambipolar particle transport, with the electron transport being negligibly small. However, in a sharp density pedestal with sub-sonic ion flows the electron transport can be comparable to the ion and impurity flows. Furthermore, the neoclassical particle transport is not intrinsically ambipolar, and the non-ambipolarity of the fluxes extends outside the pedestal region by the radial coupling of the perturbations. The neoclassical momentum transport, which is finite in the presence of ion orbit-width scale profile variations, is significantly enhanced when impurities are present in non-trace quantities, even if the total parallel mass flow is dominated by the bulk ions.

Nyckelord: tokamak pedestal, neoclassical transport, impurities, momentum transport, radially global



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Denna post skapades 2016-07-01. Senast ändrad 2016-08-26.
CPL Pubid: 238770

 

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