Diffusion and Radiation in Magnetized Collisionless Plasmas with High-Frequency Small-Scale Turbulence

TL;DR

This paper provides a detailed theoretical and numerical analysis of particle transport and radiation in magnetized collisionless plasmas with small-scale turbulence, highlighting its diagnostic potential for various plasma environments.

Contribution

It introduces a comprehensive model linking particle diffusion and radiation spectra in small-scale turbulence, applicable to laboratory and astrophysical plasmas.

Findings

Radiation spectra differ from synchrotron and cyclotron emissions.

Particle diffusion is closely related to turbulence characteristics.

The study offers a diagnostic tool for plasma analysis.

Abstract

Magnetized high-energy-density plasmas can often have strong electromagnetic fluctuations whose correlation scale is smaller than the electron Larmor radius. Radiation from the electrons in such plasmas, which markedly differs from both synchrotron and cyclotron radiation, and their energy and pitch-angle diffusion are tightly related. In this paper, we present a comprehensive theoretical and numerical study of the particles' transport in both cold, "small-scale" Langmuir and Whistler-mode turbulence and its relation to the spectra of radiation simultaneously produced by these particles. We emphasize that this relation is a superb diagnostic tool of laboratory, astrophysical, interplanetary, and solar plasmas with a mean magnetic field and strong small-scale turbulence.