INVESTIGATION OF LARGE-SIGNAL KLYSTRON AND TRAVELING-WAVE DEVICES.
Quarterly progress rept. no. 2, 1 Dec 64-28 Feb 65,
MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB
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Solutions obtained from the digital computer on nonlinear interaction equations for Brillouin focused linearbeam devices are described. It is possible to handle both uniform as well as varying axial magnetic fields. Harmonic current amplitudes are shown for the former case. The specification of initial and boundary conditions on the nonlinear boundary-value solution for electron and plasma devices presented some difficulties. Methods for overcoming these problems are shown. Simplifying assumptions in the stability problem of beams in the presence of large r-f signals are described. It is the goal to find closed-form solutions of the simplified system of equations. A similar approach is being undertaken in the case of start-oscillation conditions of backward-wave oscillators. The phase velocity taper for a ring-and-bar tube has been chosen. The impedance variation and velocity profiles for this circuit are shown. Some saturation data for the untapered tube is presented. Results obtained from a relativistic electron gun program are described. A highly convergent gun with a converging magnetic field was used in the case considered to date. Design considerations and expected operating parameters for a UHF tube using a magnetron injection gun are presented. Author