A statistical analysis approach of plasma dynamics in gyrokinetic simulations of stellarator turbulence
Paper in proceeding, 2022

A geometrical method is used for the analysis of stochastic processes in plasma turbulence. Distances between thermodynamic states can be computed according the thermodynamic length methodology which allows the use of a Riemannian metric on the phase space. A geometric methodology is suitable in order to understand stochastic processes involved in e.g. order-disorder transition, where a sudden increase in distance is expected. Gyrokinetic simulations of Ion-Temperature-Gradient (ITG) mode driven turbulence in the core-region of the stellarator W7-X, with realistic quasi-isodynamic topologies are considered. In gyrokinetic plasma turbulence simulations avalanches, e.g. of heat and particles, are often found and in this work a novel method for detection is investigated. This new method combines the Singular Spectrum Analysis algorithm and Hierarchical Clustering such that the gyrokinetic simulation time series is decomposed into a part of useful physical information and noise. The informative component of the time series is used for the calculation of the Hurst exponent, the Information Length and the Dynamic Time. Based on these measures the physical properties of the time series is revealed.

Author

A. Papadopoulos

National Technical University of Athens (NTUA)

Johan Anderson

Chalmers, Space, Earth and Environment

E. Kim

Coventry University

M. Mavridis

Aristotle University of Thessaloniki

H. Isliker

Aristotle University of Thessaloniki

48th EPS Conference on Plasma Physics, EPS 2022

48th European Physical Society Conference on Plasma Physics, EPS 2022
Virtual, Online, ,

Implementation of activities described in the Roadmap to Fusion during Horizon Europe through a joint programme of the members of the EUROfusion consortium

European Commission (EC) (101052200), 2021-01-01 -- 2025-12-31.

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Fusion, Plasma and Space Physics

More information

Latest update

1/3/2024 9