Gridded cusp gun for a terahertz gyro-amplifier

Zhang, Liang and Donaldson, Craig R. and He, Wenlong and Phelps, Alan D. R. and Ronald, Kevin and Cross, Adrian W. (2019) Gridded cusp gun for a terahertz gyro-amplifier. In: 12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019), 2019-08-20 - 2019-08-22, Queen Mary University of London.

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    Abstract

    A terahertz gyrotron traveling wave amplifier (gyro-TWA) centered at 372 GHz is under development for the electron paramagnetic resonance (EPR) imaging application. This paper reports on the investigation of a triode-type cusp electron gun for the 372 GHz gyro-TWA. The simulation results showed that at the beam alpha (the ratio of transverse to axial velocity) centered at 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.