Radially global δf computation of neoclassical phenomena in a tokamak pedestal
Artikel i vetenskaplig tidskrift, 2014

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.

simulation code

neoclassical transport

tokamak pedestal

radially global

Författare

M. Landreman

F. Parra

P. Catto

D. Ernst

Istvan Pusztai

Chalmers, Teknisk fysik, Nukleär teknik

Plasma Physics and Controlled Fusion

0741-3335 (ISSN) 1361-6587 (eISSN)

Vol. 56 4 045005-

Styrkeområden

Energi

Ämneskategorier

Fusion, plasma och rymdfysik