Fractal and Wada escape basins in the chaotic particle drift motion in tokamaks

• Published in: arXiv.org
• Main Authors: Souza, Leonardo C, Mathias, Amanda C, Caldas, Iberê L, Elskens, Yves, Viana, Ricardo L
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 16.02.2024
• Subjects: Basins; Drift; Entropy; Fractals; Physics - Computational Physics; Physics - Plasma Physics; Tokamak devices; Uncertainty
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2212.10616

The \({\bf E}\times{\bf B}\) drift motion of particles in tokamaks provides valuable information on the turbulence-driven anomalous transport. One of the characteristic features of the drift motion dynamics is the presence of chaotic orbits for which the guiding center can experience large-scale drifts. If one or more exits are placed within that chaotic orbit, the corresponding escape basins structure is complicated and, indeed, exhibits fractal structures. We investigate those structures through a number of numerical diagnostics, tailored to quantify the final-state uncertainty related to the fractal escape basins. We estimate the escape basin boundary dimension through the uncertainty exponent method, and quantify final-state uncertainty by the basin entropy and the basin boundary entropy. Finally, we describe the so-called Wada property, for the case of three or more escape basins. This property is verified both qualitatively and quantitatively, using a grid approach.