| Texto completo | |
| Autor(es): |
Haerter, P.
;
Caldas, I. L.
;
Viana, R. L.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physics of Plasmas; v. 32, n. 7, p. 10-pg., 2025-07-01. |
| Resumo | |
The interplay between drift-wave coherence and particle transport in plasmas is investigated through a truncated Hasegawa-Mima model coupled with a drift-wave Hamiltonian model. By reducing the system to a three-wave interaction, we identify regimes of periodic and chaotic wave amplitudes and link them to the emergence or suppression of zonal flows. Numerical simulations reveal two distinct transport regimes: hyperballistic motion under periodic waves, where coherent zonal flows channel particles poloidally, and superdiffusive spreading under chaotic waves, where non-periodic fields disrupt directional coherence. Particle tracking indicates that periodic waves enhance radial confinement while enabling rapid poloidal transport, whereas chaotic fluctuations suppress large-scale migration through chaotic scattering. These results highlight the critical role of wave-field coherence in determining transport efficiency and offer a conceptual framework for turbulence control, highlighting that manipulating the coherence of the turbulent field, in addition to its amplitude, is a key strategy for controlling plasma transport. The findings connect reduced-order models with fully turbulent systems, offering insights into harnessing self-organized structures, such as zonal flows, for improved plasma confinement. C2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).https://doi.org/10.1063/5.0276163 (AU) | |
| Processo FAPESP: | 24/05700-5 - Dinâmica não linear |
| Beneficiário: | Iberê Luiz Caldas |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |