First result of the KEK X-band free electron laser in the ion channel guiding regime

Abstract Recent experimental results are reported for an induction-driven X-band FEL, with ion channel guiding inside the wiggler. Power in excess of 10 MW at 9.4 GHz, has been observed with a beam energy of 750 keV and a current of 520 A. Maximum gain is 22 dB/m, with no saturation after 15 wiggler periods. A self-amplified spontaneous power of 4 kW was also measured. Data for the detuning curve, field evolution and current transmission are presented and discussed.

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