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The collective free-electron laser interaction has been studied at millimeter wavelengths using a newly designed experimental apparatus which features an electron beam of low emittance. Measurements in a superradiant amplifier configuration indicate the production of 35 MW at {~}4 mm with an efficiency of 2.5%. The parametric dependence of power thresholds and wavelength on pump and guide magnetic fields are shown to be in agreement with theory.
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Parker et al. (1982) studied this question.
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