Electromagnetically pumped free-electron laser in the scheme of separate interaction space from pump wave generator

The theory of an electromagnetically pumped free-electron laser in the scheme of a separate interaction space from the pump wave generator is developed, taking into account the transverse inhomogeneity of incident and scattered waves, and the presence of a magnetic field of 20 kG focusing the particles. The nonlinear computation results, including the coupling coefficients, the excitation curves, powers and efficiency, etc., are obtained on a set of input parameters of our recently established accelerator and FEL system with a pulse high-current relativistic electron beam (600 kV, 3 kA, 70 ns). An experiment is demonstrated in which the relativistic backward wave corrugation oscillator provides a TM/sub 01/ pump wave with the power of 100 MW at 3 cm wavelength and connects with a smooth tube interaction section to produce stimulated scattering radiation with integral power of 1 MW at 38 mm wavelengths. Also, the numerical and the measured results are compared and discussed.<
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