Runaway electron synchrotron radiation in a vertically translated plasma

TitleRunaway electron synchrotron radiation in a vertically translated plasma
Publication TypeJournal Article
Year of Publication2020
AuthorsM. Hoppe, G. Papp, T. Wijkamp, A. Perek, J. Decker, B. Duval, O. Embreus, T. Fülöp, U. Sheikh, TCV team, EUROfusion MST1 Team
JournalNuclear Fusion
Volume60
Issue9
Pagination094002
Type of ArticleLetter
Abstract

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 à Configuration Variable (TCV) tokamak and compare it with predictions from the synthetic synchrotron diagnostic Soft. 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.

URLhttps://arxiv.org/abs/2003.10512
DOI10.1088/1741-4326/aba371
Division

FP

Department

PEPD

PID

96a58ee447b8d0b376575841ef9fa00f

Alternate TitleNucl. Fusion
LabelOA

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