Abstract
Frequency -resolved measurements of emission from a superradiant millimeter -wave free -electronlaser using an intense relativistic electron beam have demonstrated high power, good efficiency, highgain, and broad gain bandwidth, and broad tunability, all in good agreement with theoretical predictionsfor operation in the collective regime.I. INTRODUCTIONThe collective- interaction free -electron laser (FEL), using anintense relativistic electron beam of moderate voltage (1 -2 MeV)and low velocity spread (iss /sz < -0.1 %), has the potential ofproviding a high power, high gain, moderate intrinsic efficiencysource of continuously tunable coherent radiation in the millimeter
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