Abstract
Unstimulated bremsstrahlung in a transverse undulating magnetic field («magnetic wiggler») by a relativistic electron beam is investigated by means of relativistic quantum kinetics in which the incident laser wave is the first-order perturber to the electron motion, while the magnetic wiggler is treated as a classical field, which wiggles the electrons in the transverse direction. Thus, the unper-turbed state is represented by the solution of the first-order Dirac equation describing the motion of a relativistic electron in the magnetic wiggler approximated as an electromagnetic wave, and the solution is derived from the Volkov solution. It is found that the spontaneous-emission power in the laser-axis direction scales as the cube of the electron energy.
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