Experimental and theoretical studies of a coaxial free-electron maser based on two-dimensional distributed feedback

I. V. Konoplev, A. W. Cross, A. D. R. Phelps, W. He, K. Ronald, C. G. Whyte, C. W. Robertson, P. MacInnes, N. S. Ginzburg, N. Yu. Peskov, A. S. Sergeev, V. Yu. Zaslavsky, and M. Thumm
Phys. Rev. E 76, 056406 – Published 30 November 2007

Abstract

The first operation of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback has been recently observed. Analytical and numerical modeling, as well as measurements, of microwave radiation generated by a FEM with a cavity defined by coaxial structures with a 2D periodic perturbation on the inner surfaces of the outer conductor were carried out. The two-mirror cavity was formed with two 2D periodic structures separated by a central smooth section of coaxial waveguide. The FEM was driven by a large diameter (7cm), high-current (500A), annular electron beam with electron energy of 475keV. Studies of the FEM operation have been conducted. It has been demonstrated that by tuning the amplitude of the undulator or guide magnetic field, modes associated with the different band gaps of the 2D structures were excited. The Ka-band FEM generated 15MW of radiation with a 6% conversion efficiency, in good agreement with theory.

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  • Received 23 January 2007

DOI:https://doi.org/10.1103/PhysRevE.76.056406

©2007 American Physical Society

Authors & Affiliations

I. V. Konoplev*, A. W. Cross, A. D. R. Phelps, W. He, K. Ronald, C. G. Whyte, C. W. Robertson, and P. MacInnes

  • SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom

N. S. Ginzburg, N. Yu. Peskov, A. S. Sergeev, and V. Yu. Zaslavsky

  • Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod. 603950 Russia

M. Thumm

  • Institut für Höchstfrequenztechnik und Elektronik, Universität Karlsruhe, Karlsruhe D-76131, Germany and Forschungszentrum Karlsruhe, Institut für Höchleistungsimpuls- und Mikrowellentechnik, Karlsruhe D-76021, Germany

  • *Author to whom correspondence should be addressed. FAX: +44-141-5522891. acp96115@strath.ac.uk

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Issue

Vol. 76, Iss. 5 — November 2007

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