Runaway electron synchrotron radiation in a vertically translated plasma
Artikel i vetenskaplig tidskrift, 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
Författare
Mathias Hoppe
Chalmers, Fysik, Subatomär, högenergi- och plasmafysik
G. Papp
Max-Planck-Gesellschaft
T. Wijkamp
Dutch Institute for Fundamental Energy Research (DIFFER)
Technische Universiteit Eindhoven
A. Perek
Dutch Institute for Fundamental Energy Research (DIFFER)
J. Decker
Ecole Polytechnique Federale de Lausanne (EPFL)
B. Duval
Ecole Polytechnique Federale de Lausanne (EPFL)
Ola Embréus
Chalmers, Fysik, Subatomär fysik och plasmafysik
Tünde Fülöp
Chalmers, Fysik, Subatomär, högenergi- och plasmafysik
U. A. Sheikh
Ecole Polytechnique Federale de Lausanne (EPFL)
Nuclear Fusion
0029-5515 (ISSN) 1741-4326 (eISSN)
Vol. 60 9 094002Ämneskategorier
Acceleratorfysik och instrumentering
Subatomär fysik
Fusion, plasma och rymdfysik
DOI
10.1088/1741-4326/aba371