Abstract
Light amplification by a relativistic electron beam traveling in a laser light and an electrostatic (ES) wave propagating in the direction antiparallel to the beam direction (“electric wiggler”) through an emission whose transverse source current is produced by the laser light is calculated by relativistic quantum kinetics. From the viewpoint of quantum kinematics, this emission is exactly the same as the free-electron two-quantum Stark emission in which the transversely oscillating source current needed for the axial emission is due to the intrinsic electron spin angular momentum. These two emissions are different in dynamics since the former is an one-quantum process while the latter is a two-quantum process. It is suggested that the experimentally-observed plasma-maser emission is due to both.
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