  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.
