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Prebunched high-harmonic FEL for short-pulse millimeter wave emission

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4 Author(s)
McDermott, D.B. ; Dept. of Appl. Sci., California Univ., Davis, CA, USA ; Hartemann, F.V. ; Balkcum, A.J. ; Luhmann, N.C., Jr.

A novel wide-band millimeter-wave source is described where a “point-charge” electron beam rotating within a bifilar wiggler will generate a short-pulse TEmn wavepacket at the mth-harmonic of the fundamental free electron laser (FEL) frequency. In this first-order interaction, all electrons lose energy to the wave if the electron bunch size is much less than the wavelength. For a grazing intersection of the beam mode with the waveguide mode, there is no slippage of the electron bunch in the wave and the narrow width of the broad-band output pulse is limited only by the waveguide's dispersion. A linear theory of this new interaction is presented along with the design for a prebunched tenth harmonic FEL proof-of-principle experiment that is predicted to generate a 140-ps pulsewidth 30-GHz wavepacket at kilowatt power levels

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Plasma Science, IEEE Transactions on  (Volume:24 ,  Issue: 3 )