Radiation reaction induced non-monotonic features in runaway electron distributions
Artikel i vetenskaplig tidskrift, 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.

Författare

Eero Hirvijoki

Chalmers, Teknisk fysik, Nukleär teknik

Istvan Pusztai

Chalmers, Teknisk fysik, Nukleär teknik

Joan Decker

Ecole Polytechnique Federale De Lausanne

Ola Embréus

Chalmers, Teknisk fysik, Nukleär teknik

Adam Stahl

Chalmers, Teknisk fysik, Nukleär teknik

Tünde Fülöp

Chalmers, Teknisk fysik, Nukleär teknik

Journal of Plasma Physics

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

Vol. 81 475810502-

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1017/S0022377815000513