Abstract

We determine the general expression for the power exchanged between a thin beam of electrons, TE and TM waves in the presence of an open slow-wave structure, and a guiding magnetic field. When the system is illuminated only with a TM wave, the gain due to the longitudinal oscillations is identical to that in the case when an infinite magnetic field is present but, in addition, the transverse oscillation contributes to the absorbed power; the optimal magnetic field that should be applied is established. The maximal gain in the TE case is found to increase linearly with the intensity of the guiding field. When both fields are present there is a magnetic field that maximizes the additional power that emerges.

© 1990 Optical Society of America

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