Thomson backscattering of CO₂-laser radiation is used to determine the parallel momentum spread of a 1-kA/cm², 700-kV magnetized electron beam, emitted from a cold cathode in an apertured diode. The beam is found to be suitable for Raman free-electron-laser applications: a normalized momentum spread of (0.6±{}0.14)% was obtained for the inhomogeneous broadening; it is also found that the use of an undulator will cause an increase of the broadening.
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Chen et al. (1984) studied this question.
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