Radially global δf computation of neoclassical phenomena in a tokamak pedestal

Matt Landreman, Felix I. Parra, Peter J. Catto, Darin R. Ernst, Istvan Pusztai

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number045005
JournalPlasma Physics and Controlled Fusion
Volume56
Issue number4
DOIs
StatePublished - Apr 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Keywords

  • H-mode
  • edge
  • flow
  • neoclassical
  • pedestal
  • tokamak

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