Work

Multi-scale geometrical Lagrangian statistics of heavy impurities in drift wave turbulence

Year: 2025

Type: article

Abstract: We investigate the behavior of heavy impurities in edge plasma turbulence by analyzing their trajectories using the Hasegawa–Wakatani model. Through direct numerical simulations, we track ensembles of charged impurity particles over hundreds of eddy turnover times within statistically steady turbulent flows. Assuming that heavy impurities lag behind the flow, a novel derivation of relaxation time of heavy impurities is proposed. Our results reveal that heavy impurities can cluster within turbulence. We provide multiscale geometrical Lagrangian statistics of heavy impurities trajectories. To quantify directional changes, we analyze the scale-dependent curvature angle, along with the influence of the Stokes number on the mean curvature angles and the probability distribution function of curvature angles.

Source: Plasma Physics and Controlled Fusion

DOI: 10.1088/1361-6587/adc508

Authors: Zetao Lin, Benjamin Kadoch, Sadruddin Benkadda, Kai Schneider

Institutions: Institut de Mathématiques de Marseille, Institut Universitaire des Systèmes Thermiques Industriels, Physique des interactions ioniques et moléculaires, Aix-Marseille Université

Language: English

Topic: Magnetic confinement fusion research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Agence Nationale de la Recherche

Award: Adaptive Characteristic Mapping Method for the Euler Equations