Investigation of the dynamics of heating metal-dielectric structures with nanometer conductive film under the influence of microwave fields

The paper presents the results of experimental studies and analysis of the dynamics of heating of metal-dielectric structures (MDS) with aluminum conducting films on glass or sitall substrates when exposed to powerful microwave fields, as well as when exposed to direct and alternating currents.

Methods for increasing the efficiency of shapers powerful microwave radiation in the task of electromagnetic destruction of a group of radio-electronic means.

Methods for increasing the efficiency of electromagnetic field shapers based on powerful microwave generators in case of electromagnetic defeat to a group of radio-electronic means distributed on the earth is surface have been determined. As an indicator of efficiency the radius of the zone of electromagnetic defeat of the most resistant radio-electronic mean was chosen. The limitations of the maximum power of the generator due to the finite energy of the power supply and (or) the electrical strength of the air in the radiating antenna are taken into account. It was found that the main methods to improve the efficiency of the electromagnetic field formers are the choice of the radiation parameters of the generator and the directivity characteristics of the radiating antenna. The optimal modes of operation of a microwave generator with a limited energy the power source have been determined. A comparison is made of the efficiency of shapers with different types of radiating antennas. It is shown that antennas with narrow toroidal radiation patterns are the most preferable for solving the problem under consideration.

Parameters of the electric strength of air in a surface antenna during the emission of an ultrahigh-frequency pulse with a trapezoidal envelope

On the basis of the breakdown criterion and the equation of continuity of electrons in air, the amplitude and energy parameters of the electric strength of air in the surface antenna of a powerful microwave relativistic generator are determined when pulses are emitted with a trapezoidal envelope. Triangular and rectangular envelopes were considered as boundary cases of a trapezoidal envelope. The dependence of the parameters of electric strength on the shape of the envelope has been established. The calculation of the dependences of the breakdown field and the maximum permissible energy in a flat aperture on the pulse duration in the range of realizable durations of powerful relativistic microwave generators is carried out. For the same duration, the largest breakdown field has a pulse with a triangular envelope, and the smallest a pulse with a rectangular envelope. Wherein a pulse with a triangular envelope has the lowest maximum permissible energy, and a rectangular one has the highest. The relationships between the maximum permissible energy and the breakdown field for the pulses under consideration are determined. With the same maximum permissible peak amplitude, the highest energy has a pulse with a triangular envelope, and the smallest a pulse with a rectangular envelope.

Generation of ultra-powerful microwave pulses in stretcher-amplifier-compressor systems.

We theoretically investigate the possibility of generating ultra-high-power ultrashort microwave pulses based on the Chirped-Pulse Amplification (CPA) method, which is widely used in laser physics. This method includes preliminary elongation of the initial pulse in a stretcher, sequential amplification of spectral components in a broadband amplifier, and compression in a line with negative dispersion (compressor). We consider the scheme in which waveguides with multi-fold helical corrugation are used as dispersing elements (stretcher and compressor), and a relativistic Cherenkov TWT or helical gyro-TWT is used as an amplifier. For the parameters of experimentally realized amplifiers in the 30 GHz range, we show that the peak pulse power in the stretcher-amplifier-compressor system significantly exceeds not only the saturation level of the amplifier, but also more than 4 times higher than the power of the used electron beam.

THE ION ENERGY IN A PLASMA RESONATOR EXCITED BY A POWERFUL MICROWAVE PULSE AT ECR FREQUENCY

The possibility of heating argon plasma ions with a density of ≈1013 cm-3 to 2 keV in a resonator placed in a magnetic field of a plug configuration when oscillations were excited at an electron-cyclotron resonance frequency with an electric field strength of up to 12 kV/cm in a pulse with a duration of 1.8 μs was shown experimentally. Ions acquire high energy in the fields of stochastic low-frequency ion oscillations due to the development of a modified decay of microwave oscillations.