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Neoclassical flows in deuterium-helium plasma density pedestals

Stefan Buller (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; István Pusztai (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Sarah Newton (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; John Omotani (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers))
Plasma Physics and Controlled Fusion (0741-3335). Vol. 59 (2017), 5, p. 055019.
[Artikel, refereegranskad vetenskaplig]

In tokamak transport barriers, the radial scale of profile variations can be comparable to a typical ion orbit width, which makes the coupling of the distribution function across flux surfaces important in the collisional dynamics. We use the radially global steady-state neoclassical delta f code PERFECT [Landreman et al 2014 Plasma Phys. Control. Fusion 56 045005] to calculate poloidal and toroidal flows, and radial fluxes, in the pedestal. In particular, we have studied the changes in these quantities as the plasma composition is changed from a deuterium bulk species with a helium impurity to a helium bulk with a deuterium impurity, under specific profile similarity assumptions. In the presence of sharp profile variations, the poloidally resolved radial fluxes are important for the total fluxes to be divergence-free, which leads to the appearance of poloidal return-flows. These flows exhibit a complex radial–poloidal structure that extends several orbit widths into the core and is sensitive to abrupt radial changes in the ion temperature gradient. We find that a sizable neoclassical toroidal angular momentum transport can arise in the radially global theory, in contrast to the local.

Nyckelord: Neoclassical transport, fusion, tokamak, helium, deuterium, flows



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Denna post skapades 2016-11-29. Senast ändrad 2017-05-15.
CPL Pubid: 245720

 

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