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Design and numerical optimization of a cusp-gun-based electron beam for millimeter-wave gyro-devices

Donaldson, Craig and He, Wenlong and Cross, A.W. and Phelps, A.D.R. and Li, Fengping and Ronald, K. and Robertson, C.W. and Whyte, C.G. and Young, A.R. (2009) Design and numerical optimization of a cusp-gun-based electron beam for millimeter-wave gyro-devices. IEEE Transactions on Plasma Science, 37 (11). pp. 2153-2157. ISSN 0093-3813

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Abstract

A novel thermionic cusp electron gun operating in the temperature-limited regime that produces a large-orbit electron beam through a nonadiabatic magnetic-field reversal was designed, analyzed, and optimized to give an electron-beam ideal for driving gyro-devices, particularly in the millimeter-to-submillimeter-wavelength range due to its small cross-sectional size. The annular-shaped axis-encircling electron beam had a beam current of 1.5 A at an acceleration potential of 40 kV, a tunable velocity ratio alpha (= vperp/vz) between one and three, an optimized axial velocity spread A.vx/vz of ~8%, and a relative alpha spread Deltakappa/alpha of ~10% at an alpha value of 1.65.