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Effect of bremsstrahlung radiation emission on distributions of runaway electrons in magnetized plasmas (1511.03917v1)

Published 12 Nov 2015 in physics.plasm-ph

Abstract: Bremsstrahlung radiation is an important energy loss mechanism for energetic electrons in plasmas. In this paper we investigate the effect of bremsstrahlung radiation reaction on the electron distribution in 2D momentum space. We show that the emission of bremsstrahlung radiation leads to non-monotonic features in the electron distribution function and describe how the simultaneous inclusion of synchrotron and bremsstrahlung radiation losses affects the dynamics of fast electrons. We give quantitative expressions for (1) the maximum electron energy attainable in the presence of bremsstrahlung losses and (2) when bremsstrahlung radiation losses are expected to have a stronger effect than synchrotron losses, and verify these expressions numerically. We find that, in typical tokamak scenarios, synchrotron radiation losses will dominate over bremsstrahlung losses, except in cases of very high density, such as during massive gas injection.

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