Gyrokinetics of transversemagneticmode gyrotron, gyropeniotron, cyclotron autoresonance maser, and nonwiggler freeelectron laser amplifiers Phys. Fluids B 1, 2502 (1989); 10.1063/1.859185 Radiation growth in a millimeterwave freeelectron laser operating in the collective regime Phys. Fluids 27, 746 (1984); 10.1063/1.864650 Breakdown of the atmosphere by emission from a millimeterwave freeelectron maser Appl. Phys. Lett. 43, 922 (1983); 10.1063/1.94181 Study of gain, bandwidth, and tunability of a millimeterwave freeelectron laser operating in the collective regime Phys. Fluids 26, 2683 (1983);Experimental results on high-power long-pulse free-electron laser (FEL) and cyclotron autoresonance maser (CARM) experiments are summarized. Single-mode operation of a freeelectron laser oscillator at 27.4 GHz with a Bragg resonator has been obtained, with an output power of 990 kW for a beam energy of 320 keV and transmitted current of 30 A, corresponding to an efficiency of 10.3%. Free-electron maser (FEM) amplifier operation at 35 GHz has yielded a gain of 26 dB with an output power of 800 kW, corresponding to an efficiency of 8.6%. CARM oscillator experiments at 32 GHz with a different electron gun have yielded lower powers because of poor beam quality; planned CARM experiments are discussed.
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