Transport barrier for the radial diffusion due to the ExB drift motion of guiding centers in cylindrical confinement geometry

TL;DR

This paper presents a method to create transport barriers in cylindrical plasma confinement by modifying electrostatic potentials, effectively reducing radial particle diffusion due to ExB drift in guiding center approximation.

Contribution

It introduces an algorithm for local potential modification to establish transport barriers, demonstrating robust control of radial diffusion with minimal probes.

Findings

Significant reduction in radial transport achieved

Transport barrier constructed via electrostatic potential modification

Control remains effective with limited measurement probes

Abstract

We consider the radial transport of test particles due to the ExB drift motion in the guiding center approximation. Using an explicit expression to modify the electrostatic potential, we show that it is possible to construct a transport barrier which suppresses radial transport. We propose an algorithm for the implementation of this local modification computed from an electrostatic potential known on a spatio-temporal grid. The number of particles which escape the inner region defined by the barrier measures the efficiency of the control. We show that the control is robust by showing a significant reduction of radial transport, when applied with a reduced number of probes aligned on a circle.