Abstract
Electron beam oscillates in a dense plasma irradiated by a strong laser light. When the frequency of the laser light is high and its intensity is large, the acceleration of oscillating electron becomes large and the electrons radiate electromagnetic waves. As the reaction, the electrons feel a damping force, whose effect on oscillating electron motions is investigated first. Second, the collective motion of electron beam induces the strong electromagnetic field by its own electric current when the electron number density is high. The induced electric field reduces the oscillation motion and deforms the beam.
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