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) 1741-4326 (eISSN)
Vol. 60 9 094002Subject Categories
Accelerator Physics and Instrumentation
Subatomic Physics
Fusion, Plasma and Space Physics
DOI
10.1088/1741-4326/aba371