Design of a high-efficiency low voltage axially modulated cusp-injected second-harmonic x-band gyrotron amplifier
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Date
1996-06Author
Lawson, W.
Grigoropoulos, A.
Liu, A.
Saraph, G.
Rodgers, J.
Destler, William
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Show full item recordAbstract
We present the theoretical design of a secondharmonic
small-orbit gyrotron amplifier which utilizes the interaction
between a 35-kV 4-A beam and a TEoll 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 TMono 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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