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A 32 ghz bragg free-electron maser (FEM) oscillator with axial guide magnetic field

Cross, A.W. and Ginzburg, N.S. and He, W. and Jaroszynski, D.A. and Peskov, N.Y. and Phelps, A.D.R. and Whyte, C.G. (1998) A 32 ghz bragg free-electron maser (FEM) oscillator with axial guide magnetic field. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 407 (1). pp. 181-186. ISSN 0168-9002

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A narrow-band Free-Electron Maser (FEM) oscillator with a Bragg resonator was operated in the reversed guide field regime. A high-current accelerator generated the 300keV, 30A, 100ns electron beam. Radiation at 32GHz frequency and 500kW power, corresponding to ~5% efficiency, was measured. The measured FEM parameters agreed with predictions of a numerical simulation. The observed radiation frequencies compared well with ''cold'' microwave calibration of the cavity.