Free Electron Lasers and Stimulated Scattering from Relativistic Electron Beams.
NAVAL RESEARCH LAB WASHINGTON D C
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Free electron lasers based on stimulated scattering from relativistic electron beams show potential for a new class of coherent radiation sources ranging from millimeter wavelengths down to optical wavelengths and beyond which are characterized by continuous tunability, very high power levels and competitive efficiencies. Here we present a comprehensive fully-relativistic treatment of stimulated backscattering from an electron beam with streaming velocity betasub zoc. The incident pump wave is taken to be a static, circularly polarized, periodic magnetic field with wavenumber K sub O the frequency of the scattered radiation is betasub zo cksub O1-betasub zo. The analysis is linear in the scattered wave fields, but contains the pump field to all orders. The physical mechanism of the backscattering is provided by the v X B ponderomotive forces acting on the beam electrons in the presence of both the pump and the scattered waves. This force produces a longitudinal charge bunching which in turn gives rise to source currents for the scattered waves.
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