Cusp electron gun with modulation electrode for a THz gyro-amplifier

Zhang, Liang and Donaldson, Craig R. and He, Wenlong and Phelps, Alan D. R. and Cross, Adrian W.; (2019) Cusp electron gun with modulation electrode for a THz gyro-amplifier. In: 44th International Conference on Infrared, Millimeter, and Terahertz Waves. IEEE, FRA. ISBN 9781538682852 (

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A terahertz gyrotron traveling wave amplifier (gyro-TWA) centered at 370GHz is under development for the electron paramagnetic resonance (EPR) imaging application. This paper reports the investigation of a triode-type cusp electron gun for the terahertz gyro-TWA. The simulation results showed that at the beam alpha (the ratio of transverse to axial velocity) center of 1.07, an optimal alpha spread of ∼ 10\% was achieved, when it was operated at a beam voltage of 50 kV and a beam current of 0.35 A.