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Latest experimental developments of W-band gyro-devices with helically corrugated waveguides and a cusp electron gun are presented. The cusp generated a 40 keV, 1.5 A axis-encircling electron beam. Helical corrugated waveguides have ideal dispersive properties which improve the frequency tuning range of a gyrotron backward wave oscillator (gyro-BWO) whilst maintaining the already good efficiency of...
Presented in this paper is the design of a W-Band Gyro-BWO with a helically corrugated waveguide and a cusp electron gun. The interaction region has been constructed with good accuracy and microwave results measured using a vector network analyzer are given. The microwave dispersion agrees well with analytical and numerical theory. The transmission loss of this helically corrugated waveguide was measured...
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