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| SMALL SIGNAL THEORY FOR THE BACKWARD WAVE FREE ELECTRON LASERS |
| Kong Gangyu; Zhou Wen |
| Zhejiang University, Hangzhou |
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Abstract A detailed analysis for the backward wave free electron laser (FEL) in small signal regime is conducted, following the single partical approach. By the use of a modified factor Fm, the formulas resulted are similar to those of normal FELs. To compare with normal FELs, these formulas show that the backward wave FELs have two main features: the high energy conversion! effeciency and the loose e-beam quality requirement. So it is suitable to be one stage of the two-stage FEL.
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Received: 28 September 1987
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1989, Vol. 11 
