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Experimental demonstration of a W-band gyro-BWO using a helically corrugated waveguide

Donaldson, C. R. and He, W. and Phelps, A. D. R. and Li, F. and Zhang, L. and Cross, A. W. and Ronald, K. and Robertson, C. W. and Whyte, C. G. and Young, A. R. (2010) Experimental demonstration of a W-band gyro-BWO using a helically corrugated waveguide. In: 35th International Conference on Infrared, Millimeter and Terahertz Waves, 2010-09-05 - 2010-09-10.

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The experimental demonstration of a gyrotron backward wave oscillator (gyro-BWO) using a cusp electron gun and helically corrugated waveguide will be presented. Operating in the W-band frequency range the gyro-BWO is predicted to output similar to 10kW with a frequency tuning range of 85-104 GHz at 18% electronic efficiency before the energy recovery. The annular axis-encircling electron beam has been experimentally measured to show a 1.5 A, 40 kV beam with velocity ratio up to 1.56 at 1.65 T. Preliminary microwave radiation has been measured over a frequency range of 92 to 100 GHz.