A drift-kinetic approach to neoclassical transport theory for plasmas with large toroidal rotation
| Autor: | V. S. Chan, S. K. Wong |
|---|---|
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 11:3432-3442 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | A formulation of the neoclassical transport theory for tokamak plasmas with large toroidal velocities that can be comparable to the ion thermal velocity is presented using the drift kinetic equation. In this formulation, the motion of the guiding centers is the same as in the small rotation theory, but the radial electric field is considered stronger: the ordering Er/Bθ∼vi is adopted where Bθ is the poloidal magnteic field and vi the ion thermal velocity. A complete set of transport coefficients for both electrons and ions is calculated in the large-aspect-ratio limit in the banana regime for flux surfaces of arbitrary shape. The calculation utilizes a recently developed method of matched asymptotic expansions for particle and energy fluxes and a regular perturbation for the angular momentum flux. The consistent application of perturbation for large-aspect-ratio provides a satisfactory explanation why the angular momentum flux is much smaller than the ion energy flux. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|