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Design and simulation of a cusp gun for use in gyro-amplifiers

Rowlands, D.H. and He, W. and Whyte, C.G. and Young, A.R. and Cross, A.W. and Phelps, A.D.R. and Robertson, C.W. and Ronald, K. (2006) Design and simulation of a cusp gun for use in gyro-amplifiers. In: Conference Digest of the 2006 Joint 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics. IEEE, p. 519. ISBN 1-4244-0400-2

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Abstract

Gyro-amplifiers have potential as the high frequency RF drivers for particle accelerators. They require relativistic electron beams with low velocity spread and with a high fraction of the electron energy associated with the cyclotron motion. For harmonic operation and mode control an axis-encircling beam is desirable. The passage of an electron beam through a non-adiabatic magnetic field reversal (cusp) converts part of the electron beam's axial velocity into axis-encircling transverse velocity. A cusp-based electron beam forming system, yielding a 10 MW, 150 kV, 70 A axis-encircling beam will be presented. This cusp gun is being designed as the electron beam source for a microwave gyro-amplifier that is relevant for high frequency accelerator applications. The latest results from numerical simulations and experiments are presented and compared