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The experimental demonstration of a W-band gyro-BWO using both thermionic cusp electron gun and helically corrugated waveguide will be presented. A cusp gun uses a non-adiabatic magnetic field reversal to obtain azimuthal motion on an electron beam resulting in an annular shaped, axis-encircling beam. The cusp gun was designed to generate a beam of 1.5A at 40kV with an adjustable velocity ratio of...
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