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Lasing and radiation-mode dynamics in a Van de Graaff accelerator–free-electron laser with an internal cavity

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17 Author(s)
Abramovich, A. ; Department of Electrical Engineering and Physical Electronics, Faculty of Engineering, Tel-Aviv University, Ramat Aviv 69978, Israel ; Arensburg, A. ; Chairman, D. ; Eichenbaum, A.
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The lasing of a Van de Graaff electrostatic accelerator–free-electron laser (EA–FEL) with an internal cavity is reported. An EA–FEL employing an internal cavity is a FEL configuration that has a potential to operate at high average power, high frequency, and possibly in a continuous wave (cw) mode. The initial lasing provided a pulsed radiation power of 1 kW at 100.5 GHz frequency. The FEL operated with a 1.4 A, 1.4 MeV electron beam in a recirculation (depressed collector) configuration. It utilizes a high quality (Q≈30 000) Talbot effect resonator and a Halbach-type wiggler placed internally in the center of the accelerator tank. Nonlinear features of the oscillation power buildup and decay near saturation and mode hopping were observed and are interpreted. © 1997 American Institute of Physics.

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Applied Physics Letters  (Volume:71 ,  Issue: 26 )