Guiding-center simulations of nonlocal and negative inertia effects on rotation in a tokamak

T. Kurki-Suonio, Jukka A. Heikkinen, S. I. Lashkul

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The magnitude of the radial electric field (Er), resulting from nonambipolar fluxes of neoclassical origin, is evaluated using Monte Carlo guiding-center simulations for a low-current plasma corresponding to the FT-2 tokamak {Fisichiskii Tokamak-2, Ioffe Institute, St. Petersburg [S. I. Lashkul, V. N. Budnikov, E. O. Vekshina et al., Plasma Phys. Rep. 27, 1001 (2001)]}.
The Er-values are found to significantly exceed those given by the standard neoclassical theory, based on thin-orbit assumption, when the plasma current is sufficiently low and the pressure gradient is sufficiently high.
Strong Er-structures are found to form in the same low plasma-current range where enhanced confinement is reported in the FT-2 tokamak. In the simulations, the physics behind the strong increase in the field values is intimately related to the poloidal Mach-number, together with the wide ion orbits.
Original languageEnglish
Article number072510
JournalPhysics of Plasmas
Volume14
Issue number7
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • plasma transport processes
  • Tokamak devices
  • ToKamak
  • plasma toroidal confinement
  • plasma flow
  • plasma simulation
  • Monte Carlo methods
  • plasma pressure
  • Mach number
  • fusion energy
  • fusion reactors

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