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Experimental studies of microwave amplification in the ion-focused regime

By: Ozaki, T.; Monaka, T.; Kishiro, J.-i.; Hiramatsu, S.; Ebihara, K.; Whittum, D.H.; Takayama, K.;

1993 / IEEE

Description

This item was taken from the IEEE Periodical ' Experimental studies of microwave amplification in the ion-focused regime ' Studies of microwave amplification with an in-focused electron beam drawn from an induction injector are reported. A free-electron laser (FEL) operating at 9.4 GHz and employing ion-focusing within the interaction region has achieved power in excess of 30 MW at 9.4 GHz, with a beam energy of 0.8 MeV and current of 0.7 kA. Peak gain is 20 dB/m, with no saturation after 15 wiggler periods. Also reported are the first evolution and detuning data for an ion-channel laser/maser (ICL). Two shortcomings of the prematurely halted ICL studies are poor frequency discrimination and a large axial plasma gradient. Prospects for operation with an upgraded 1.6 MeV accelerator are discussed.<>