[en] The properties of a plasma-resonator slow-wave structure for high-power beam-plasma microwave amplifiers are studied by breaking it up into separate regions. The phase velocity, circuit resistance, and energy fluxes of the system of internal coupled waves are found as functions of the frequency. The radial structure of the fields and energy fluxes is investigated. It is shown that the power of at least two types of hybrid waves can be completely removed from the plasma waveguide while retaining the internal radial structure of the longitudinal electric fields of the spatial harmonics. 6 refs., 4 figs

[en] Internal G waves excited in a chain of coupled cavities, the drift tube of which is filled with a uniform magnetized plasma, have a high bandwidth coupling impedance of up to 50%. In this connection it is of great interest to study the interaction between electron beams and these systems in order to produce efficient microwave devices based on the beam-plasma interaction. As shown by Mitin et al., in periodic plasma-cavity systems for oscillations of the cavity cells of a single radical type a whole family of internal waves is excited, which can be divided into two classes according to the criterion of emissivity into the external microwave feeders: plasmalike and electromagnetic. The energy fluxes of the former are completely concentrated in the drift tube of the system, and it is therefore physically completely acceptable to assume that they are space-charge fields, while the electromagnetic component of the total field can be regarded as the active wave of the system. We have solved the problem using the macroparticle technique, where the working equations are the equations of plasma-filled backward wave tube

[en] The work is aimed at the investigation into non-linear electron flux bunching under velocity modulated cylindric beam transparance in a plasma waveguide. The calculations are performed by a method of large particles in a one-dimensional problem setting for cold plasma and cold beam approximation

[en] It is ascertained that under a steady-state electron beam injection to plasma a non-linear phase resonance takes place under which the phase velocity of a wave in plasma decreases in synchronism with the beam velocity

[en] Short communication

[en] The microwave plasma-beam amplifier is designed in centimeter wavelength range. The amplifier has a decelerating structure in the form of a chain of connected resonators. The gas-dynamic system maintains gas pressure in decelerating structure up to 10^-3 torr. Plasma gives a possibility to increase power of microwave radiation by a factor of 2-8 times

[en] The results of theoretical and experimental investigations of a generator of stochastic microwave power based on a beam-plasma inertial feedback amplifier is discussed with a view to using stochastic oscillations for plasma heating. The plasma heating efficiency in the region of low-frequency resonance in the geometry of the Tokamak is considered theoretically. It is shown that the temperature of heating is proportional to the power multiplied by the spectra width of the noiselike signal. The creation and heating of plasma by stochastic microwave power in an oversized waveguide without external magnetic field is discussed with a view to plasma-chemistry applications. It is shown that the efficiency of heating are defined by the time of phase instability of the stochastic power. (author). 3 figs., 13 refs

[en] The possibility of the nonlinear phase resonance between an electron beam and a plasma wave excited by this beam is demonstrated. The resonance involves the modulation of the beam, which can cause the separation of the beam into individual bunches, and a synchronous decrease in the beam velocity and the phase velocity of the excited plasma wave. When the bunches are trapped by the wave, i.e., in the nonlinear stage of the instability associated with the Cherenkov resonance, the wave amplitude is larger than in the case of a linear plasma response. For a preliminary modulated beam, if the depth of the spatial modulation is large and the dimensions (in the phase space) of individual electron bunches in the modulated beam are small, all plasma electrons are trapped by the wave, and the amplification of the plasma wave in a plasma-beam system increases by more than an order of magnitude

[en] The interaction of electron beams with electromagnetic waves in plasma filled waveguides is investigated theoretically. It is shown that plasma can considerably improve the characteristics of vacuum microwave devices and allow to reach the higher amplification, efficiency and output power

[en] The plasma filled slow-wave structures (hybrid structures) have been considered. Dispersion characteristics, field topography and microwave power flux distribution in a chain of inductively connected cavities with plasma filled beam channel have been investigated. The gain, start current, thresholds of bifurcation and efficiency, were estimated. The generators were created on this base in S-band with an efficiency about 50% and high output power of 40 kW in continuous operation and 100 kW in pulse of 4 ms duration. It has been elaborated and created the power beam-plasma generator of stochastic oscillations in decimeter range using helix-plasma systems. The efficiency was 38% and output power reached 70 kW in pulse of 400 μs duration