Radiation reaction induced non-monotonic features in runaway electron distributions
Journal article, 2015

Runaway electrons, which are generated in a plasma where the induced electric field exceeds a certain critical value, can reach very high energies in the MeV range. For such energetic electrons, radiative losses will contribute significantly to the momentum space dynamics. Under certain conditions, due to radiative momentum losses, a non-monotonic feature – a “bump” – can form in the runaway electron tail, creating a potential for bump-on-tail-type instabilities to arise. Here we study the conditions for the existence of the bump. We derive an analytical threshold condition for bump appearance and give an approximate expression for the minimum energy at which the bump can appear. Numerical calculations are performed to support the analytical derivations.

Author

Eero Hirvijoki

Chalmers, Applied Physics, Nuclear Engineering

Istvan Pusztai

Chalmers, Applied Physics, Nuclear Engineering

Joan Decker

Ecole Polytechnique Federale De Lausanne

Ola Embréus

Chalmers, Applied Physics, Nuclear Engineering

Adam Stahl

Chalmers, Applied Physics, Nuclear Engineering

Tünde Fülöp

Chalmers, Applied Physics, Nuclear Engineering

Journal of Plasma Physics

0022-3778 (ISSN) 1469-7807 (eISSN)

Vol. 81 5 475810502-

Driving Forces

Sustainable development

Areas of Advance

Energy

Roots

Basic sciences

Subject Categories

Fusion, Plasma and Space Physics

DOI

10.1017/S0022377815000513

More information

Latest update

5/3/2018 1