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Relativistic electrons emit synchrotron radiation due to their gyro- and guiding-centre motions in a curved magnetic field. In this article, the kinetic theory of relativistic electron beams is developed to account for radiation reaction by including the Abraham�Lorentz reaction force in the kinetic equation. As an application of this theory, the dynamics of runaway electrons is examined and a steady-state solution is constructed describing a balance between acceleration by the electric field, pitch-angle scattering, and radiation reaction. Furthermore, it is found that a beam of relativistic electrons can be slowed down by the combined effects of pitch-angle scattering and radiation reaction. This damping can be more efficient than ordinary collisional drag, and appears to explain the decay of post-disruption runaway currents in the Joint European Torus (JET) [R. D. Gill, Nucl. Fusion 33, 1613 (1993)].

Additional information

Authors: ANDERSSON F, Chalmers University of Technology and EURATOM-VR Association, Goteborg (SE);HELANDER P, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ERIKSSON L-G, Association EURATOM-CEA sur la Fusion, CEA Cadarache, St. Paul lez Durance (FR)
Bibliographic Reference: An article published in: Physics of Plasmas, December 2001, Volume 8, Issue 12, pp. 5221-5229
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