Latest experiments of W-band gyro-BWO using helically corrugated waveguides

He, W. and Donaldson, C. R. and Zhang, L. and McElhinney, P. and Phelps, A. D. R. and Ronald, K. and Cross, A. W.; (2013) Latest experiments of W-band gyro-BWO using helically corrugated waveguides. In: 2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, DEU. ISBN 9781467347174

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Abstract

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 operation. The output power of the gyro-BWO was measured to be 12 kW with a frequency tuning range of 88-103 GHz.