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Electric current pulses of nanosecond length and amplitude up to 300 kV traveling through a transmission line partially filled with a magnetically saturated ferrite demonstrate excitation of quasi-monochromatic oscillations at 0.7–2.5 GHz. The amplitude efficiency of this DC-to-RF conversion can reach 50%. The two-dimensional model used for numerical analysis of the non-linear electromagnetic effects...
Experimental results and data of numerical simulations are presented, concerning generation of wideband radio frequency (RF) oscillations in a nonlinear transmission line (NLTL) which contains a pre-magnetized core of ferrite material. Emphasis is made on the means for extracting the RF signal from the line, in order to radiate it into free space. Antennas of two types that can be used for the purpose...
The operation of millimeter-wave relativistic magnetrons is considered for devices of the traditional and the inverted design. The high-voltage, pulsed devices employ explosive emission of electrons in electric fields about (1÷5)·107 V/m near the emitting surface. The electric parameters like these allow magnetron generation with either polarity of the DC driving pulse, both in the traditional and...
The dynamics of charged particle beams emitted from a cathode into a ‘smooth’ coaxial diode with magnetic insulation (MICD) is studied with the aid of 3-D simulation. The processes controlling space charge formation and its evolution in the MICD are modeled for the structure geometries typical of high-voltage millimeter wave magnetrons1 that are characterized by very high values of emission currents,...
The paper presents a procedure and results of a numerical simulation of a pulsed electromagnetic wave traveling through a coaxial transmission line, partially filled with a ferrite material and placed in a longitudinal magnetic field. The evolution of the pulsed signal is analyzed, especially in connection with generation of monochromatic oscillations. The dependences of their frequency and amplitude...
The performance and details of design are discussed for impulse Tesla transformers with various numbers of primaries. Possible ways of parameter optimization are suggested.
The paper describes several versions of the ‘half-reflector’ impulse radiating antenna, intended for operation with high voltage sources, such as to provide electric field intensities about 70 kV/m at distances r > 20 m away from the aperture. The TEM horn feed of the antenna consists of cylindrical conductors (metal pipes), which geometry ensures a better stability against electric breakdown....
The dynamics of high-voltage pulsed discharge in nitrogen is studied experimentally under the conditions as follows: gas pressure 30 to 60 atm; applied voltage 200 to 400 kV; rise-time of the initial pulse 0.4 to 20 ns. The results are compared with the data of other writers.
Aspects of design of a multi-sectional Tesla transformer (MTT) presented as a system with three primaries are discussed. Calculation and experimental characteristics of MTT, and its advantages (lower currents in the primary, higher efficiency together with lower duration of the period) in comparison with traditional TT are shown.
Current distribution in relativistic magnetron (RM) of 8-mm wavelength has been studied experimentally and with the help of 3D simulation. Existence of direct and return axial electron flows that sufficiently disturb to the RM operation is considered.
Experimental study of a Tesla transformer (TT), intended for high-voltage power supply of subrelativistic electron devices is carried out. Tuning technique of TT and obtained experimental data are considered.
Tesla transformer (TT) operation is denoted by losses in primary circuit. The spark resistance of gas switch and its affect to TT performance are studied both experimentally and theoretically.
Design aspects and test results of high-pressure (60 atm) gas switch incorporating into high-voltage UWB coaxial forming line (with the output voltage of 200–600 kV, and rise-time of 0.2–0.4 ns) are considered.
The new modification of a compact generator based on a virtual cathode (VC) for generation of noise-type chaotic microwave signals was proposed and investigated with the help of 3D electromagnetic code. It has been shown that realization of compact drift space for the electron beam promotes VC formation and chaotization of output radiation of the generator. The physical processes responsible for the...
Features of impulse reflectometry using sub-nanoseconds pulses are considered. Impacts of non-uniformities in the system to the measured signal parameters are analyzed. An algorithm for observed data processing that takes into account the test signal envelope and numerous reflections originating in non-uniform system is proposed.
Features and results of experimental parametrical study of high-voltage breakdown in dense dielectric media are considered. Influence of temporal characteristics of the test system to breakdown parameters of dielectric is shown. Design and performance data of voltage and current sensors together with algorithm for experimental data processing are discussed.
Impulse electromagnetic fields of large intensity in combination with ultra-short pulse (USP) duration are widely used for modification a property of materials, creation special types of radars and test facilities at studies of electromagnetic compatibility/strength (EMC/S). Long-term experience of NSC KIPT in the area of highpower impulse radiation sources used for tests of radioand electronic equipment...
Features of impulse reflectometry of the sub-nanosecond range are considered. The influence of parameters of a probing signal in the ultrabroadband nonuniform systems on the results of measurements is analyzed. An algorithm of processing of measurement data that allows accounting of the shape of the probing signal and numerous reflections, originating from nonuniform systems, is proposed.
The characteristics of measurements of parameters of impulses of the subnanosecond range in the coaxial waveguides by capacitive dividers of different type are considered. Advantages of application of dividers with partial integration and procedure of subsequent numerical restoration of initial impulse are showed.
3D electromagnetic simulation is used to study generator on a virtual cathode with feedback (FB). Implementation of FB through the input cavity in a double-stream mode provides premodulation of an electron beam that magnifies the overall performance of the device. The electromagnetic FB between input and output cavities provides changing of the intensity and frequency structure of oscillations of...
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