Abstract
In this paper numerical solution of exact magnetic field for planar and cylindrical beam driven backward wave oscillator is carried out at π point. Our results show that for beam parameters V b =5.32×108 cm s−1, relativistic factor γ=1.16, and beam voltage = 80kv, nearly 7kG magnetic field is required to focus both electron beam at π point. We obtain the comparable enhancement in the growth rate of planar beam driven backward wave oscillator as compared to that of cylindrical beam.
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