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Design and operation of a collective millimeter-wave free-electron laser

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10 Author(s)
Jackson, R.H. ; Mission Research Corp., Alexandria, VA, USA ; Gold, S.H. ; Parker, R.K. ; Freund, H.P.
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A new free-electron laser experiment has been designed at NRL to operate at millimeter wavelengths using a collective beam-wave interaction. Critical features of the experiment include an apertured diode which provides a low-emittance electron beam, a wiggler magnet with adiabatic entrance and exit, and an operational domain centered around the wiggler-guide field gyroresonance. With the experiment configured as a superradiant amplifier, the effects of the gyroresonance on beam dynamics and the beam-wave interaction have been studied. Measurements indicate a peak power production of 35 MW at 4 mm with an electronic efficiency of 2.5 percent. Aspects of the experimental design are discussed, and the results of a parametric study of the power dependence on the fields are presented. Detailed calculations (both analytic and computational) have been performed to analyze the linear and non-linear effects in the experiment. The results of these calculations are shown to be in good agreement with laboratory measurements.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:19 ,  Issue: 3 )

Date of Publication:

Mar 1983

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