Title :
Experimental studies of microwave amplification in the ion-focused regime
Author :
Whittum, D.H. ; Ebihara, K. ; Hiramatsu, S. ; Kishiro, J. ; Monaka, T. ; Ozaki, T. ; Takayama, K.
Author_Institution :
KEK, Ibaraki, Japan
fDate :
2/1/1993 12:00:00 AM
Abstract :
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
Keywords :
electromagnetic wave propagation in plasma; free electron lasers; laser beam applications; plasma-beam interactions; wigglers; 0.7 kA; 0.8 MeV; 1.6 MeV; 30 MW; 9.4 GHz; FEL; accelerator; axial plasma gradient; detuning; evolution; free-electron laser; frequency discrimination; in-focused electron beam; induction injector; ion-channel laser/maser; laser-guided propagation; microwave amplification; peak gain; plasma column; wiggler periods; Electron beams; Free electron lasers; Frequency; Gain; Ion accelerators; Laser beams; Masers; Plasma accelerators; Power lasers; Undulators;
Journal_Title :
Plasma Science, IEEE Transactions on
