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Experimental study of a FEM based on a 2D distributed feedback cavity

Konoplev, I.V. and McGrane, P. and Ronald, K. and Cross, A.W. and He, W. and Whyte, C.G. and Phelps, A.D.R. and Robertson, C.W. and Speirs, David and Ginzburg, N.S. and Peskov, N. Yu and Sergeev, A.S. and Thumm, M. (2005) Experimental study of a FEM based on a 2D distributed feedback cavity. In: The Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics. IEEE, New Jersey, USA, pp. 499-500. ISBN 0780393481

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Abstract

We report operation of a co-axial free-electron maser (FEM) based on two-dimensional distributed feedback. The 37.3GHz FEM was driven by an annular electron beam (475kV, 500A, 250ns) and generated 15MW ±1.5MW of radiation with a 6% conversion efficiency. To investigate an increase in FEM output power and efficiency a new cavity configuration based on a copper 2D Bragg reflector is studied.