| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000376099 |
| ISSN: | 0103-9733 |
| Autors: | Jazayeri, S.M1 Sohrabi, A.R2 |
| Institucions: | 1Iran University of Science and Technology, Physics Department, Teherán. Irán 2Islamic Azad University, Faculty of Computer and Information Technology Engineering, Qazvin. Irán |
| Any: | 2014 |
| Període: | Jun |
| Volum: | 44 |
| Número: | 2-3 |
| Paginació: | 247-254 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | We use a method based on the conservation of energy, the mean-energy error criterion, to approximately locate the place of a cantorus by locating the series of its convergents. The mean-energy error curve has nearly stationary parts in the vicinity of elliptic (minimax) orbits, the so-called magnetic islands. Stable minimax orbits converge to orbits homoclinic to a cantorus. By tracing the island series, we limit the cantorus to a narrow region. A near-critical perturbation parameter is used so that, while the cantorus may be destabilized, its high-order minimax orbits remain intact. As illustrations, we consider two symplectic maps, systematically derived from the Hamilton–Jacobi equation and Jacobi’s theorem, in the context of the magnetically confined plasmas in a tokamak: a symmetric tokamap realistically reproduces the main features of a tokamak, and a symmetric ergodic magnetic limiter (EML) map is defined to describe the action of EML rings on the magnetic field lines in the tokamak |
| Disciplines | Física y astronomía |
| Paraules clau: | Física, Magnetismo, Conservación de la energía, Mapas simplécticos, Limitador magnético ergódico |
| Keyword: | Physics and astronomy, Physics, Magnetism, Energy conservation, Ergodic magnetic limiter, Symplectic maps |
| Text complet: | Texto completo (Ver HTML) |
