Abstract
We report experimental results demonstrating 54% power conversion efficiency (43% energy conversion efficiency), from a two-stage X-band traveling wave tube amplifier designed for high-power operation. The first stage of the amplifier is a 12-cm-long Boron Nitride dielectric section used to modulate the electron beam. The second stage consists of a long high-phase-velocity bunching section followed by a short low-phase-velocity output section. Output powers of up to 78 MW with narrow spectrum width were obtained with ∼700 kV, ∼200 A beam.
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