Damping of relativistic electron beams by synchrotron radiation
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)].
Bibliographic Reference: An article published in: Physics of Plasmas, December 2001, Volume 8, Issue 12, pp. 5221-5229
Record Number: 200214382 / Last updated on: 2002-02-14
Original language: en
Available languages: en