Guiding-center simulations of nonlocal and negative inertia effects on rotation in a tokamak
- Euratom-Tekes Association, Helsinki University of Technology, P.O. Box 4100, FI-02015 HUT (Finland)
The magnitude of the radial electric field (E{sub r}), 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 E{sub r}-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 E{sub r}-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.
- OSTI ID:
- 20975166
- Journal Information:
- Physics of Plasmas, Vol. 14, Issue 7; Other Information: DOI: 10.1063/1.2749501; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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