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

Fingerprint

plasma currents
inertia
orbits
low currents
pressure gradients
Mach number
low pressure
simulation
physics
electric fields
ions

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

Cite this

Kurki-Suonio, T. ; Heikkinen, Jukka A. ; Lashkul, S. I. / Guiding-center simulations of nonlocal and negative inertia effects on rotation in a tokamak. In: Physics of Plasmas. 2007 ; Vol. 14, No. 7.
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title = "Guiding-center simulations of nonlocal and negative inertia effects on rotation in a tokamak",
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.",
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",
author = "T. Kurki-Suonio and Heikkinen, {Jukka A.} and Lashkul, {S. I.}",
year = "2007",
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Guiding-center simulations of nonlocal and negative inertia effects on rotation in a tokamak. / Kurki-Suonio, T.; Heikkinen, Jukka A.; Lashkul, S. I.

In: Physics of Plasmas, Vol. 14, No. 7, 072510, 2007.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Guiding-center simulations of nonlocal and negative inertia effects on rotation in a tokamak

AU - Kurki-Suonio, T.

AU - Heikkinen, Jukka A.

AU - Lashkul, S. I.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - plasma transport processes

KW - Tokamak devices

KW - ToKamak

KW - plasma toroidal confinement

KW - plasma flow

KW - plasma simulation

KW - Monte Carlo methods

KW - plasma pressure

KW - Mach number

KW - fusion energy

KW - fusion reactors

U2 - 10.1063/1.2749501

DO - 10.1063/1.2749501

M3 - Article

VL - 14

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1527-2419

IS - 7

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ER -