Mechanism of transport in symplectic maps applied to magnetic confined plasmas
Transport of magnetic field lines and particles in tokamaks and plasma modeling fo...
| Full text | |
| Author(s): |
Mugnaine, Michele
;
Caldas, Ibere L.
;
Szezech Jr, Jose D.
;
Viana, Ricardo L.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW E; v. 108, n. 5, p. 12-pg., 2023-11-13. |
| Abstract | |
For tokamaks with uniform magnetic shear, Martin and Taylor have proposed a symplectic map which has been used to describe the magnetic field lines at the plasma edge perturbed by an ergodic magnetic limiter. We propose an analytical magnetic field line map, based on the Martin-Taylor map, for a tokamak with arbitrary safety factor profile. With the inclusion of a nonmonotonic profile, we obtain a nontwist map which presents the characteristic properties of degenerate systems, such as the twin islands scenario, shearless curve, and separatrix reconnection. We estimate the width of the islands and describe their changes of shape for large values of the limiter current. From our numerical simulations about the shearless curve, we show that its position and aspect depend on the control parameters. (AU) | |
| FAPESP's process: | 18/03211-6 - Non linear dynamics |
| Grantee: | Iberê Luiz Caldas |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 22/12736-0 - Oscillations in magnetically confined plasmas |
| Grantee: | Michele Mugnaine |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |