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Validation of klystrons development code -KLYS 4.5During last ten years klystron developers in "Toriy" have been using the code ttKLYS 4.5)) (version 4 of interface and version 5 of math models). This code allows to model output characteristics of single-and multibeam klystrons that may contain input and output ladder-type filters, single-and double gap cavities, and the second harmonic cavities.The codes based on one-dimensional disc models of the electron beam are usually used in the design and development of klystrons due to insufficient speed of operation of modern personal computers. The one-dimensional disc model with additional modifications is also used in ttKLYS 4.5)) code. Hence there is a question regarding the possible accuracy of output characteristics computation in designing of klystrons with different power level in different frequency bands with different types of magnetic focusing.The estimation of possibilities of code and its precision was obtained from the solution of the set of test problems. Consider some of basic test problems.1. The comparison of the simulated with ((KLYS 4.5)) code output characteristics and experimental characteristics was made for the given klystron construction, its cavities electrodynamic parameters, beam current and voltage, and beam envelope. This problem was solved for many klystrons with different output power level and frequency hand (Fig. 1).2. Initially electrodynamic parameters of cavities, those are natural frequency, Q-factor and WQ-relation, are unknown. These parameters are found in the result of comparison of the two simulated and experimental amplitude-frequency response (AFR) curves in linear and saturation regimes respectively by given beam voltage and current. After that there were compared the sets of simulated and experimental AFR curves by the other beam voltage and current (Fig. 2).3 . AFR curves of wide band klystron were computed and measured. The specific phenomenon in wide band klystron the so-called "zeros of AFR' may be used in testing of programs (Fig. 3 ) .4. Double-gap cavities klystron was designed with the help of code

An experimental approach is proposed for research of the interaction beyond the passband of a coupled cavity chain slow wave structure, and the characteristics of a traveling wave tube are experimentally analyzed.