V.I. Rogovin – Ph.D.(Phys.-Math.), Associate Professor, Deputy Director of RPC «Electronic systems»,  JSC «SPE «Almaz» (Saratov); 

Department «Bases of Micro-wave Devises Design», Saratov State University named after N.G. Chernyshevsky E-mail: rogovinvi@almaz-rpe.ru

D.A. Tyurin – Research Scientist, 

JSC «RPE «Almaz»

One of the main approaches of increasing the TWTs efficiency is to use inhomogeneous slow wave structures with a step that varies along the length of the interaction space.

A designing method various purposes helix TWTs using the optimization method has been developed. The method makes it possible to obtain an initial approximate version of the construction of the interaction space. To determine the values of the output characteristics of the TWT, a program based on solving nonlinear equations of the interaction of the electron beam with the electromagnetic field of the slow-wave structure in the one-dimensional approximation was used. The goal function for optimization is the electronic efficiency, and the variable parameters are the pitches of the slow wave structure and their coordinates. The optimization program is based on the Rosenbrock method.

Using the proposed method, the interaction space of C-band narrowband TWT and the interaction space of broadband TWT X, Kuband, whose analogues were previously developed, were designed and optimized. As a result of narrowband TWT optimization, the electronic efficiency was 49.7%, which is 7% more than the electronic efficiency in absolute value relative to the analogue. For broadband TWT, as a optimization result, the electronic efficiency of the device increased 1.1 times, and the minimum value in the working frequency band was 12.38%.

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