Runaway electron synchrotron radiation in a vertically translated plasma
Journal article, 2020

Synchrotron radiation observed from runaway electrons (REs) in tokamaks depends upon the position and size of the RE beam, the RE energy and pitch distributions, as well as the location of the observer. We show experimental synchrotron images of a vertically moving RE beam sweeping past the detector in the Tokamak a Configuration Variable (TCV) tokamak and compare it with predictions from the synthetic synchrotron diagnosticSoft. This experimental validation lends confidence to the theory underlying the synthetic diagnostics which are used for benchmarking theoretical models of and probing runaway dynamics. We present a comparison of synchrotron measurements in TCV with predictions of kinetic theory for runaway dynamics in uniform magnetic fields. We find that to explain the detected synchrotron emission, significant non-collisional pitch angle scattering as well as radial transport of REs would be needed. Such effects could be caused by the presence of magnetic perturbations, which should be further investigated in future TCV experiments.

tokamak

runaway electrons

synchrotron radiation

SOFT

TCV

Author

Mathias Hoppe

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

G. Papp

Max Planck Society

T. Wijkamp

Dutch Institute for Fundamental Energy Research (DIFFER)

Eindhoven University of Technology

A. Perek

Dutch Institute for Fundamental Energy Research (DIFFER)

J. Decker

Swiss Federal Institute of Technology in Lausanne (EPFL)

B. Duval

Swiss Federal Institute of Technology in Lausanne (EPFL)

Ola Embréus

Chalmers, Physics, Subatomic and Plasma Physics

Tünde Fülöp

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

U. A. Sheikh

Swiss Federal Institute of Technology in Lausanne (EPFL)

Nuclear Fusion

0029-5515 (ISSN)

Vol. 60 9 094002

Subject Categories

Accelerator Physics and Instrumentation

Subatomic Physics

Fusion, Plasma and Space Physics

DOI

10.1088/1741-4326/aba371

More information

Latest update

12/9/2020