Abstract

Attenuation of the radiation field by an intense, mildly relativistic electron beam moving in a longitudinal magnetic field was studied experimentally in the frequency range of x-band microwaves. Nearly complete absorption of the radiation externally injected along the beam was found to be near a particular value of the axial guide magnetic field. The interaction mechanism is identified as the coupling between the waveguide modes and the beam cyclotron wave propagating backwards. It is concluded that the absorption should be the inverse process of the electron cyclotron maser by a dense relativistic electron beam.

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