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P.14. Sadovoi G. S. (Novosibirsk State Technical University, Novosibirsk, Russia)


The status of the ultrahigh frequency (UHF) powerful generators for accelerators is dis- cussed. Characteristics and limiting parameters of accelerators of the charged particles always were defined by opportunities of radio engineering systems. High-frequency sys- tems contain generators which output cascades are executed on powerful grid-controlled tubes. In the project of the powerful UHF generator intended for use in accelerators of the charged particles, ways of the decision of two tasks are offered: increase of efficiency of the generator; increase of factor of amplification with the purpose of reduction of number of cascades. Typical parameters of power electronics are huge: power up to 1014 W, volt- age U up to 107 V, current up to 106 A, current density J up to 109 A/cm2. It is obvious, that in such high current beams it is necessary to take into account the phenomena de- pendent on space-time ratios. For research of these phenomena for a basis the concept of the author about general applicability of a principle of variability is accepted. We receive equality criterion of length of a particle wave and electron distances in a beam. A trajec- tory of electron at presence of a magnetic field is bent under action of Lorentz force. Due to this the density of a current grows, and the distance between electrons decreases and with other things being equal becomes big, than in case of absence of a magnetic field. At the same time there is an opportunity of that the De Broglie wavelength appears compara- ble with electron trajectory length. The appropriate ratios for this case are examined. Cal- culations of electric modes of the powerful triode or tetrode are carried out with use of computer modeling. The theory of the nonlinear physical phenomena in powerful tubes is developed. Problems of mathematical modeling arising at it are solved with use of object- oriented

Dr. Grigori Stepanovich Sadovoi: sadovoi@ref.nstu.ru

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    15. I.A.Frejdovich, P.V.Nevsky, V.P.Sakharov, M.Yu.Vorob'ev, Yu.N.Gavrish,

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      M.Nikolaev, A.S.Alimov, V.I.Shvedunov, Yu.D.Chernousov, V.I.Ivannikov,

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      V.Shebolaev, .Yamada, . leyev, E.A.Knapp, W.P.Trower (Toriy, Russia) Multi-beam klystrons with reverse permanent magnet focusing system as the universal RF power sources for the compact electron accelerators. High power multi-beam klystrons with reverse permanent magnet focusing system des- tined for electron accelerators are produced by SRPA "Toriy" since 80-th. In this report we describe six types of pulsed and continuous wave S-band klystrons and present some details of electron accelerators which are fed by these klystrons. We also describe pa- rameters of the perspective C- and X- band klystrons for miniature electron accelerators and L-band klystron for superconducting accelerator, which can be built following the same technology.

Dr. Iliya Anatolievich Frejdovich: ilya fr@pragtech.ru


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