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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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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.