Design of an efficient, low voltage, third harmonic, large-orbit gyrotron amplifier with a vane-resonator output cavity
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Date
1996-06Author
Lawson, Wes
Destler, William
Fernandez, Anna
Liu, Arnold
Rodgers, J.
Weinstein, Jonathan
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Show full item recordAbstract
We present the design of a 100 kW, J-band, third
harmonic large-orbit gyrotron amplifier which utilizes the interaction
between a 45 kV, 4 A beam and a vane resonator
output cavity operating in the “?r”-mode. An efficiency of 55%
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. High efficiency is achieved by velocity modulation of an
axially-streaming annular beam via a short TM310 drive cavity.
Ballistically created axial bunches are converted into azimuthal
bunches when the beam encounters a nonadiabatic, balanced
magnetic field reversal at the end of a 30 cm drift region. The
design of this tube is presented and its performance is completely
characterized before the prospects for the operation of this low
voltage configuration at other harmonics are explored.
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