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Experimental and computational studies of novel coaxial 2D Bragg structures for a high-power FEM

Konoplev, I.V and Phelps, A.D.R and Cross, A.W and Ronald, K and McGrane, P and He, W and Whyte, C.G and Ginzburg, N.S and Peskov, N.Yu and Sergeev, A.S and Thumm, M (2004) Experimental and computational studies of novel coaxial 2D Bragg structures for a high-power FEM. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 528 (1-2). pp. 101-105. ISSN 0168-9002

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    Two-dimensional (2D) coaxial Bragg structures have been suggested for use in high-power Free Electron Masers (FEM) to synchronize radiation from different parts of an oversized annular electron beam. In this paper, the simulations of field evolution using the three-dimensional code MAGIC are carried out and results are presented. An investigation of 2D Bragg structures obtained by corrugating the inner surface of the outer conductor of a coaxial waveguide or by lining the surface of a smooth waveguide with a dielectric material, which has a bi-periodic permittivity, has been conducted. Experimental studies of 2D Bragg structures were also undertaken and the good agreement between experimental measurements and theoretical predictions is demonstrated. Measurements of a 7 cm diameter annular electron beam produced by a high-current accelerator to be used to drive the FEM are presented and the experimental set-up discussed.