Control of test particle transport in a turbulent electrostatic model of the Scrape Off Layer

TL;DR

This paper investigates controlling test particle transport in a turbulent electrostatic model of the Scrape Off Layer by modifying the electric potential, achieving a significant reduction in particle diffusion.

Contribution

It introduces a Hamiltonian-based control strategy to reduce particle diffusion in a turbulent SOL model through electric potential modifications.

Findings

Achieved a three-fold reduction in test particle diffusion coefficient.

Demonstrated effectiveness of potential modification in turbulent electrostatic fields.

Analyzed particle dynamics using a 2D non-linear fluid turbulence model.

Abstract

The ${\bm E}\times{\bm B}$ drift motion of charged test particle dynamics in the Scrape Off Layer (SOL)is analyzed to investigate a transport control strategy based on Hamiltonian dynamics. We model SOL turbulence using a 2D non-linear fluid code based on interchange instability which was found to exhibit intermittent dynamics of the particle flux. The effect of a small and appropriate modification of the turbulent electric potential is studied with respect to the chaotic diffusion of test particle dynamics. Over a significant range in the magnitude of the turbulent electrostatic field, a three-fold reduction of the test particle diffusion coefficient is achieved.