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To expand the frequency band of diamond windows, we propose an antireflective periodic surface corrugation or/and placing periodic sets of metal wires along the disc surfaces.
The interaction of the fast cyclotron wave of a linear electron beam guided by a magnetic field with a counter- propagating electromagnetic wave leads to the appearance of a stop-band over a wide range of the magnetic field near its resonance. Suppression of generation in backward wave oscillators and the resonant-cyclotron method of mode selection are based on this effect, termed "cyclotron...
Summary form only given. Application of one-dimensional integral equations to simulating complicated elements of waveguide techniques provides the possibility for a correct description of different resonant situations, sharp edges, and transitions to multimode systems and cut-off sections. Note that areas of applicability of integral equations and methods of their application to-date have yet to be...
Summary form only given. We analyze conditions under which a double-humped potential function of electron beam states is formed in a system of coordinates that is moving with the electrons. We show that periodic states with large amplitudes can exist. Such states can be used as the basis for microwave oscillators with a strong Doppler frequency shift. In addition, we predict the existence of solitary...
Summary form given only. A new version of the method of coupled waves has been developed. It allows us to analyze and calculate propagation of microwave pulses through smoothly irregular waveguides even in the case of walls with finite conductivity. The suggested theory is applied to calculating wave converters in the form of curved waveguides and waveguides with periodically corrugated walls. We...
Summary form only given. The stability of stationary states of dense electron beams propagating in weakly irregular channels, in particular, in channels with non-deep periodically corrugated walls, is investigated using the method of coupled waves. We show that Bursian's instability can develop, leading to the formation of virtual cathodes or their disruption. In unlimited channels, separate zones...
Summary form only given. Microwave solid-state detectors and mixers based on the hot electron effect are widely used in relativistic high frequency electronics as a convenient means of diagnostics. These devices are used for measuring short high power pulses for frequencies ranging from hundreds of megahertz to hundreds of gigahertz. They have wide dynamic range and, importantly, are not adversely...
Summary form only given. The high sensitivity of the electric properties of semiconductors to temperature is one of the basic sources of measurement errors in detectors and mixers that use the hot electron effect. This high sensitivity limits the fields of application of these convenient, often irreplaceable, diagnostic devices. We present possible circuits for such devices that greatly reduce the...
It is shown that the accelerating electric field has an integrable singularity-on the emitting edge of a thin-walled cathode. Therefore, emitted electrons accelerate with infinitely large acceleration from such a cathode either with limited electron emission or with the current of the magnetized electron beam limited by its own space charge. The impact of the singularity on the I-V characteristic...
Summary form only given. This work presents a way to create sequential switches using propagation of the overvoltage wave along a series of switching elements. The process is based on the interaction of three dividing components. The base component consists of switches, which come into action when voltage exceeds their threshold breakdown voltage. Two auxiliary components consist of a series combination...
A method for calculating coefficients of conversions and reflections of waves in complicated waveguides and transmission lines has been developed. The suggested theory is applied to the analysis of wave processes, and to the optimization of wave transformers based on smoothly irregular coaxial lines with large cross sections. Such converters are widely used for transformation of accelerating high...
Summary form only given. The results of experimental investigations of two high power relativistic BWOs with short electrodynamic systems and input reflectors that convert an operating wave to a wave extracting radiation from the interaction space, and modulate the electron beam are presented. A variation of the quasi-static potential of the electron beam takes place in the section with deep corrugation...
We have investigated experimentally the centimeter wavelength-range relativistic Cerenkov generator. The experiments have been performed using 1.7 MV, IOkA, O.5mcs hollow electron beam produced in foilless diode. The regime of microwave generation is realized on TM mode of circular waveguide. The supression of parasitic oscillations have been provided by the beam-field interaction upon the conditions...
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