On the bootstrap current in the TJ-II stellarator
| Autor: | Julio J. Martinell, Katia Camacho |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Nuclear and High Energy Physics Radiation Ambipolar diffusion Analytical chemistry Magnetic confinement fusion Atmospheric-pressure plasma Collisionality Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas law.invention Bootstrap current Computational physics law Electric field 0103 physical sciences General Materials Science Current (fluid) 010306 general physics Stellarator |
| Zdroj: | Radiation Effects and Defects in Solids. 172:108-118 |
| ISSN: | 1029-4953 1042-0150 |
| Popis: | Bootstrap current in stellarators is usually very small since they operate solely with the magnetic confinement provided by the external currents. Since plasma pressure gradients are always present, the bootstrap current is always finite, but the magnetic design can be optimized to minimize it. In the heliac configuration, there is no optimization and therefore it is important to estimate the actual bootstrap current generated by given pressure profiles. Here, we use the configuration of the TJ-II heliac to calculate the bootstrap current for various density regimes using the kinetic code DKES. We compute the mono-energetic transport coefficients and to find first the thermal ambipolar diffusion coefficients and the corresponding radial electric field and then the respective bootstrap current. This is made taking experimental density and electron and ion temperature profiles. In spite of the convergence problems of DKES at low collisionality, we can obtain bootstrap current values with acceptable ... |
| Databáze: | OpenAIRE |
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