Transition to chaos in systems with multiple shearless transport barriers.
| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Sao Paulo, Inst Phys, Sao Paulo - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | NUCLEAR FUSION; v. 54, n. 6 JUN 2014. |
| Web of Science Citations: | 5 |
| Abstract | |
The existence of primary shearless tori is a distinguishing feature of nontwist maps. However, secondary shearless tori have been identified in the phase space of twist maps, in the neighbourhood of peculiar bifurcations of elliptic fixed points. In this paper, we report secondary shearless bifurcations in a twist symplectic map that describes chaotic field lines in tokamaks with an ergodic limiter. We identify the onset of secondary shearless tori, around elliptic fixed points within the island of stability, by examining numerical profiles of the internal rotation number. We present examples of field line transport barriers, associated with secondary shearless tori and their rupture, which reduce the usual magnetic field line escape at the tokamak plasma edge. (AU) | |
| FAPESP's process: | 10/00740-6 - Transport in Nontwist Hamiltonian systems |
| Grantee: | Celso Vieira Abud |
| Support Opportunities: | Scholarships in Brazil - Doctorate |