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Abstract:An investigation has been carried out of the feasibility
of using the interaction between a thin, solid,
spiraling electron beam of 10-20kV energy and a microwave
cavity to generate watts of CW millimeter-wave power.
Experimental results are given for several prototype
devices operating at 9.4 GHz and at 94 GHz. Power outputs
of 5W, and electronic efficiencies near 3900 , were obtained
at X-band, and moderate gain was obtained at 94 GHz. The
small-signal theory gives a good fit to the X-band data,
and the device behavior at 94 GHz is as expected from the
given beam characteristics. The performance is limited
chiefly by the velocity spread in the spiraling electron
beam, and once this can be brought under control, highpower
generation of millimeter waves appears quite
feasible with this type of device.
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