A Numerically Derived Diffusion Coefficient for Fast Alpha Transport in a Tokamak Reactor with a Magnetic Ripple
| Autor: | Marcel Haegi, Ezio Bittoni |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Physics
education.field_of_study Guiding center Tokamak 020209 energy Population General Engineering Torus 02 engineering and technology Mechanics Parameter space Numerical diffusion 01 natural sciences 010305 fluids & plasmas law.invention law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Point (geometry) Statistical physics Diffusion (business) education |
| Zdroj: | Fusion Technology. 18:373-383 |
| ISSN: | 0748-1896 |
| DOI: | 10.13182/fst90-a29270 |
| Popis: | This paper reports on calculation of alpha-particle confinement by a guiding center orbit-following numerical code which requires the computation of very long particle trajectories. Due to their enormous length, these computations are subject to the possible accumulation of small errors, and the alpha-particle population is usually extrapolated from a single-particle history for every point of the initial parameter space. To overcome these difficulties, a numerical diffusion coefficient is derived for each point of the initial parameter space by averaging over a certain number of single-particle histories for each point of this space. This method has been applied to fast-alpha-particle confinement of the Next European Torus benchmark and the numerically derived diffusion coefficients are compared with analytical expressions from theoretical models. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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