Abstract
We studied the wave dynamics in multiharmonic two-stream superheterodyne free-electron laser (TSFEL) amplifiers of H-ubitron type using multiharmonic input signals. TSFEL models with straight and helical relativistic electron beams were examined. We demonstrated the significant reduction of saturation lengths upon multiharmonic signal utilization compared to the monochromatic input signal. We found out that the using of helical electron beams in TSFEL allows to increase both amplification rates and frequency spectrum width of the signal wave on the system output. It was concluded that multiharmonic signal utilization allows to form powerful electromagnetic signals with broad frequency spectrum effectively in multiharmonic TSFELs.
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