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Radially global δf computation of neoclassical phenomena in a tokamak pedestal

M. Landreman ; F. Parra ; P. Catto ; D. Ernst ; István Pusztai (Institutionen för teknisk fysik, Nukleär teknik)
Plasma Physics and Controlled Fusion (0741-3335). Vol. 56 (2014), 4, p. 045005.
[Artikel, refereegranskad vetenskaplig]

Conventional radially-local neoclassical calculations become inadequate if the radial gradient scale lengths of the H-mode pedestal become as small as the poloidal ion gyroradius. Here, we describe a radially global δf continuum code that generalizes neoclassical calculations to allow for stronger gradients. As with conventional neoclassical calculations, the formulation is time-independent and requires only the solution of a single sparse linear system. We demonstrate precise agreement with an asymptotic analytic solution of the radially global kinetic equation in the appropriate limits of aspect ratio and collisionality. This agreement depends crucially on accurate treatment of finite orbit width effects.

Nyckelord: tokamak pedestal, neoclassical transport, radially global, simulation code



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Denna post skapades 2017-06-10.
CPL Pubid: 249683

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

Ämnesområden

Energi
Plasmafysik med fusion

Chalmers infrastruktur