Work

Hamiltonian estimation of island width threshold for stochasticity onset on edge pedestal top in the presence of a resonant magnetic perturbation

Year: 2026

Type: article

Abstract: This study applies the Hamiltonian method to analyze the nonlinear magnetic topology induced by Resonant Magnetic Perturbations (RMPs) in tokamaks. We investigate the system's chaotic behavior by comparing three methods: the renormalization method, Lyapunov exponents, and weighted Birkhoff average. A strong consistency is found among these methods in predicting the large-scale stochasticity threshold. The magnetic island width threshold provides a quantitative criterion for optimizing RMP-based edge-localized modes control, bridging a critical gap in plasma control strategies.

Source: Physics of Plasmas

DOI: 10.1063/5.0307633

Authors: Zhifei Gui, Ping Zhu, Dominique Franck Escande

Institutions: Huazhong University of Science and Technology, University of Wisconsin–Madison, Centre National de la Recherche Scientifique, Aix-Marseille Université, Physique des interactions ioniques et moléculaires

Language: English

Topic: Magnetic confinement fusion research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funder: National Magnetic Confinement Fusion Program of China

Award: G418306698