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We report narrow-band spectra (Δωω≈0.02) from a tunable (7<~ω2π<~18 GHz), Raman, free-electron laser operating in a single TE₁₁ waveguide mode. rf power levels of 100 kW at an efficiency of {~} 12% have been achieved. Measured dispersion characteristics are in good agreement with theory.
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Fajans et al. (1984) studied this question.
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