Highly energetic runaway electrons (RE) primarily emit two types of radiation: bremsstrahlung (BR) and synchrotron (SR). The former is emitted mainly in collisions with the stationary background plasma while the latter results from continuous acceleration experienced by the particle in the tokamak magnetic field. Both types of radiation are routinely used to diagnose runaway electrons at several tokamaks around the world [1, 2] and recent modelling efforts [3, 4, 5] provide more detailed simulations than ever before.
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