Cyclotron-wave Amplification Using Simultaneous Rf Coupling and Dc Pumping
Department of Electrical Engineering, Stanford University., 1963 - Electron beams - 171 pages
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
2 other sections not shown
active coupling active pumping anode axial velocity bandwidth beam current beam voltage Calif cathode center conductor characteristics circuit output cosh coupling and dc coupling coefficient cyclotron frequency cyclotron-wave amplifier dc beam velocity dc magnetic field dc pumping diagram electric field electron beam electrons entering energy experimental tube exponentially fast cyclotron wave frequency parameter function of pump helices helix with center input plane magnetic field measured mode circuit wave N.Y. 1 Attn noise figure noise temperature nomograph null obtained operation output coupler phase constant phase velocity pitch plotted polarized components power gain pump voltage pumping coefficient pumping field pumping strength quadrifilar helix quadrupole radius ratio shown in Fig signal simultaneous rf coupling sinh slow cyclotron wave solutions SPACE SIDEBANDS stationary frame transverse impedance transverse plane transverse velocity transverse waves traveling-wave tubes twisted dc field wave amplitudes wave number waveguide z-direction