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

A. Abramovich, A. Arensburg, D. Chairman, A. Eichenbaum, M. Draznin, A. Gover, H. Kleinman, I. Merhasin, Y. Pinhasi, J. S. Sokolowski, Y. M. Yakover, M. Cohen, L. A. Levin, O. Shahal, A. Rosenberg, I. Schnitzer, J. Shiloh

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Abstract

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.

Original languageEnglish
Pages (from-to)3776-3778
Number of pages3
JournalApplied Physics Letters
Volume71
Issue number26
DOIs
StatePublished - 29 Dec 1997
Externally publishedYes

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