1 Note a certain relation between oscillations in such an electron system with deceleration and oscillations in the BarkhausenKurz oscillator [19] and oscillations in an electron-wave oscillator with a decelerating field ([20, Chapter 5] Abstract -A nonrelativistic electron beam with a virtual cathode situated in the diode gap with a decelerating field is experimentally and theoretically studied. A 1D model of the electron beam in the presence of a decelerating field is constructed. Nonlinear nonstationary processes in this system are investigated by means of numerical analysis of the model. The processes are described and interpreted with regard to formation and interaction of structures in the electron flow. The theoretical results are qualitatively confirmed by the experimental data showing that the system under study can be considered as a promising controlled source of chaotic oscillations in the microwave range.

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Purifi cation of a number of silicon derivatives (chloride, lower alcoholates) formed in processing of high-purity silicon for electronic and electrical industries was considered. It was found that high-purity substances suitable for use in electronics and optics can be produced from industrial wastes.

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In extended intensive electron beams is possible excitation and spreading waves of different type. Of all the wave-types the most important are the waves of space charge. Their investigation is of great interest both in practical application (microwave devices, wave methods of ion's collective acceleration and others) and in study of fundamental problems, such as instability in beams of charged particles. In this work the results of physical experiment, devoted to investigation of linear and non-linear waves of space charge in extended electric beams, drifting in longitudinal magnetic field are given. The physical experiment determines the spheres o f application different models using for description of waves in electron beams. Method of physical experimentCarried out physical experiment is based on application of special device -electron probe[ I]. This device helps to carry out interaction of electric field, moving inside transparent for microwave fields casing with the fields of electrodynamic system, which is out of vacuum. This provides simplicity and operativeness for carrying out different tests. Probe's casing is a glass tube with thin walls (thickness -0.2 mm). Inside the tube is brought and set with the help of special technology a spiral, made from thin tungsten wire (wire's diameter -25 mkm). The spiral defends the glass from electrons and provides conditions for drifting electrons in the probe. The pitch of the spiral is rather short (approximately 120 mkm) so that to exclude interaction of electron beam with electron field of slow wave spiral waveguide. If? the pitch of the spiral is much shorter than the length of electromagnetic oscillation's wave spiral cover of the probe turns transparent for microwave fields of outside electrodynamic system. At the same time soaking of static and grid-static fields of charges inside the spiral through its surface is limited by distances which are smaller than the period. That is why for non-resonance field of beam's space charge, going along the spiral waveguide is similar to entire cylindrical surface Applying the system of cavity resonators, one of which is moving along the electron probe, it can be possible to excitate in electron beam waves of space charge and study spatial distribution space charge's density. In contrast to electron probes used earlier, the probe applied in this experiment is provided with a special broadband analisator, which helps to do P I . 253