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The results of calculation of five stage depressed collector of helix C-band TWT for space communications are described. Also was made the optimization of construction reflector with zero potential for raising of saturated efficiency.
In the theory of self-oscillating systems usually one distinguish two different kinds of self-excitation, namely soft and hard excitation. In the hard excitation mode a self-oscillation is sustained only for a sufficiently intensive initial perturbation, which amplitude exceeds a certain threshold, while a small perturbation decays. The phenomenon of hard excitation is natural for many electronic...
Effect of delayed reflection from the remote load on mode competition in two- and three-mode models of a gyrotron is considered. A system of quasi-linear delay-differential equations for slowly varying amplitudes of the modes is derived. Transitions between different generation regimes with increasing of reflection of the spurious modes are investigated analytically and numerically at different values...
We discusses the mechanism of formation of local "failures" of output power TWT in the field of coincidence frequency of minus the first spatial harmonics (IPY) and one of the higher harmonics of the amplified signal. We proposed to use section of the slow-wave system, configured to the reduction mode signal IPY to minimize this effect.
This article describes the results of two-gap cavity simulation tuned to multiple frequencies equal to three. Such a cavity can increase energy extraction uniformity of RF voltage due to the shape nearly rectangular.
The results of modeling the sub-millimeter TWT electron optical system with a low-voltage control based on the experimental data of the planar array cathode-gate structure with carbon nanostructures are performed in this work. It is shown that the cathode-gate structure including in the analyzed field emission electron gun manufacturing by lithographic processes and CVD technologies may provide the...
The report covers some important issues related to the creation of a power tetrode SPICE model including the requirements necessary for model realization in SPICE simulators. The problem of model fidelity has been discussed.
In this paper we perform experimental research results of micro breakdowns in diode gaps with the dimension less than 100 mkm. The main reason of micro breakdowns of gaps from 100mkm to 30 mkm is an explosion of nanoapexes on the cathode when the current density is about 1×108 A/cm2. In gaps less than 30 mkm the main initiator of breakdown is a warming-up and in some case also the anode material fusion...
This work considers the GaAs low-barrier diode characteristics. A comparative analysis of theoretical and experimental current-voltage characteristics a low-barrier diodes is carried out. The use a low-barrier diode in the detectors and power meters are shown.
The method of broadening the operation frequency range to the long-wave edge of powerful broadband helix TWT is suggested. It consists in the use of frequency-dependent absorbers. And, the absorber attenuation is significantly less at the lower frequency than at the upper one. Computations for ultra broadband TWT are carried out. It is shown, that due to this method an electronic efficiency at lower...
Arrays of nanotubes or nanowires might be quite promising for auto-emission cathode applications while they possess high nanotube/nanowire density and a certain degree of ordering. In this work we studied the emission properties of TiO2 nanotube arrays obtained by electrochemical anodization. The nanotube arrays were characterized by scanning electron microscopy, atomic force microscopy and optical...
Weak resonant diocotron instability non relativistic electron flow in a cylindrical magnetron diode with applied non uniform magnetic field is investigated within the framework of the hydrodynamic theory. Increments of frequency for high electrons concentration and azimuthally low-frequency perturbations are given.
The results of combining continuous TWT with power supply at various ways of switching on are presented. The ways of solving problems associated with cathode voltage drop when the TWT focus electrode is switched on by high voltage modulator.
The numerical and experimental study of electron beam in TWT with higt microperveance and quasi-hollow forms is fulfilled. The results of the numerical study of electron beam structure correspond to the experimental results.
This report summarizes the results obtained in the papers relating to the amplification of high frequency signal in crossed electric and magnetic fields. In this report we demonstrated the possibility Larmor orbit reducing at parametric resonance. Studies were conduct to the radial case.
Particular demands to magnet parameters of focusing systems for multi-beams TWT and klystrons are discussed. Restrictions on the homogeneity of the magnetic field is offered. Opportunities to improve the homogeneity of the magnetic field in the working volume is offered.
In this report, we show the ability to signal generation in systems with crossed electric and magnetic fields at parametric resonance. Authors have shown the behavior of electron cloud in next-gen generator. Estimated devices output characteristics based on the principles specified in this report were determined.
This report summarizes the results obtained in the papers relating to the generation of high-frequency signal in crossed electric and magnetic fields in a planar state. Authors have shown the behavior of electron cloud in next-gen planar generator. Estimated devices output characteristics based on the principles specified in this report were determined.
In this report, we conduct analysis of electron properties in static electric field and time-depend magnetic induction. Authors have shown simulation trajectories of the electrons in different magnetic fields at different frequencies of the magnetic fields. Are shown conditions under which the electrons do not reach the anode.
In this work an oscillator with the hot cathode executed on the basis of the two-gap resonator is investigated. The structure of the retarding field oscillator differs from the classical reflective klystron that the reflector is entered into interaction space of the resonator. It was experimentally confirmed that in the modified retarding field oscillator with the two-gap resonator excited at multiple...
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