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Design of a high-efficiency low-voltage axially modulated cusp-injected second-harmonic X-band gyrotron amplifier

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6 Author(s)
Lawson, W. ; Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA ; Grigoropoulos, A. ; Liu, A. ; Saraph, G.P.
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We present the theoretical design of a second-harmonic small-orbit gyrotron amplifier which utilizes the interactions between a 35-kV 4-A beam and a TE011 cavity to produce over 70 kW of amplified power at 9.9 GHz in a 1.83-kG magnetic field. One of the novel features of this device is that the electron gun produces an axially streaming annular beam which is velocity modulated by a short TM0n0 input cavity. Perpendicular energy is imparted to the beam via a nonadiabatic magnetic transition at the end of a 13-cm drift region. An electronic efficiency of 53% is predicted with a large signal gain near 20 dB by a single particle code which takes into account nonideal effects associated with finite beam thickness and finite magnetic field transition widths

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