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| ON THE GAIN CHARACTERS OF FREE ELECTRON LASER WITH AN AXIAL MAGNETIC FIELD |
| Yin Runjie; Huang Xinyi |
| Institute of Electronics, Academia Sinica |
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Abstract Starting from fluid mechanics-Maxwell coupled equations, a gain formula of free electron laser with an axial magnetic field is obtained by use of Laplace transform. The numerieal calculations and the analyses of the dispersion relation indicate that when the electron cyclotron frequency Ω approaches to ωi-ωp(ωi is the frequency of the incident pump wave and ωp is the electron plasma frequeney), there is a marked drop in the gain and the position of the peak of gain-pump signal mismatch curve shifts downwards from ωp. We can use the phenomenon of zero-gain to calculate ωp.
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Received: 09 February 1983
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1984, Vol. 6 
