Analysis of a kinetic model for electron heat transport in inertial confinement fusion plasmas

TL;DR

This paper investigates a reduced kinetic model for electron heat transport in inertial confinement fusion plasmas, aiming to improve accuracy over traditional diffusion methods by addressing limitations in existing models.

Contribution

The paper deepens the physical understanding, enhances the precision, and discusses the advantages of a specific reduced kinetic model for electron heat transport.

Findings

The model better captures the distribution function compared to diffusion approaches.

It accounts for sources of fast electrons beyond temperature gradients.

The improved model shows potential for more accurate plasma simulations.

Abstract

To determine the electron heat flux density on macroscopic scales, the most widely used approach is to solve a diffusion equation through a multi-group technique. This method is however restricted to transport induced by temperature gradients without accounting for other sources of fast electrons because the electric field induced by the charge separation is indirectly treated. In addition, significant discrepancies are reported on the underlying distribution function when compared to complete kinetic calculations. These limitations motivate the research for alternative reduced kinetic models. The physical content of one of them is here deepened, its precision improved and the benefit of its usage compared to other models discussed.