Cyclotron-wave Amplification Using Simultaneous Rf Coupling and Dc Pumping

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Department of Electrical Engineering, Stanford University., 1963 - Electron beams - 171 pages
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Presented is a new wideband cyclotron-wave amplifier which uses simultaneous RF coupling and dc pumping. A single quadrifilar helix is operated so that its -1 mode is synchronous with the fast cyclotron wave over the full helix passband. This coincides with the condition for dc pumping when quadrupolar dc voltages are applied to the four helix wires. The one helix then serves simultaneously as dc pump structure and as slow wave structure to couple rf energy into and out of the beam waves. A detailed analysis of simultaneous pumping and coupling is developed, using appropriate coupled-mode equations. Expressions for gain, bandwidth, and noise figure are presented in terms of practical tube parameters, especially for the case of a hollow beam in a helix with concentric inner conductor.

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General Theory of dc Pumping and rf Coupling
The wave amplitude along the beam under active dc pumping

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