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25 July 1989 Effect Of Nonlinear Mode Competition On The Efficiency Of Low Gain FEL Oscillator
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One of the most important problems in the design of high power generators of coherent radiation is the competition of many eigenmodes of the resonator for the beam energy. A simple one dimensional, multi-mode model for a low gain FEL oscillator is used to study numerically the effect of mode competition on the efficiency to produce a coherent radiation. To operate with the maximum efficiency at a single mode equilibria the current should be about three times start-oscillation current. As beam current is increased beyond four times the start oscillation value single mode operation is no longer possible. For relatively large values of the slippage parameter multimode stable equilibria are found for a broad range of the beam current values. These states have higher efficiency than the maximum efficiency of the single mode equilibrium states. With further increase of the current the radiation spectrum becomes chaotic and the behavior of efficiency is irregular.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Baruch Levush and Thomas M. Antonsen Jr. "Effect Of Nonlinear Mode Competition On The Efficiency Of Low Gain FEL Oscillator", Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989);


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