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

Konoplev, I.V. and Cross, A.W. and Phelps, A.D.R. and He, W. and Ronald, K. and Whyte, C.G. and Robertson, C.W. and MacInnes, P. (2007) Experimental and theoretical studies of a coaxial free-electron maser based on two-dimensional distributed feedback. Physical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 76 (5). 056406. ISSN 2470-0053 (http://dx.doi.org/10.1103/PhysRevE.76.056406)

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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 (7 cm), high-current (500 A), annular electron beam with electron energy of 475 keV. 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 15 MW of radiation with a 6% conversion efficiency, in good agreement with theory.

  • Item type:Article
    ID code:17125
    Dates:
    Date
    Event
    November 2007
    Published
    Notes:Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:17 Apr 2010 12:18
    Last modified:08 Apr 2024 17:32
    URI:https://strathprints.strath.ac.uk/id/eprint/17125
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