2019, Vovchenko, E. D., Kozlovskii, K. I., Lisovskii, M. I., Rashchikov, V. I., Shikanov, A. E., Shatokhin, V. L., Вовченко, Евгений Дмитриевич, Козловский, Константин Иванович, Ращиков, Владимир Иванович, Шиканов, Александр Евгеньевич, Шатохин, Вадим Леонидович

© Published under licence by IOP Publishing Ltd.Discussed two options for increasing the magnetic isolation efficiency of the electron component in a vacuum neutron tube with coaxial geometry for the acceleration of deuterons. Computer analysis of the previously developed diode systems with magnetic insulation has shown that the suppression ratio does not exceed 50%. The proposed new options of suppression systems used the current ring and diaphragm, located near the edge of the cylindrical anode. Computer analysis showed that for these acceleration geometries the suppression factor could exceed 97%.

2020, Buryakov, A. M., Ivanov, M. S., Khusyainov, D. I., Mishina, E. D., Nomoev, S. A., Vasil'evskii, I. S., Vinichenko, A. N., Kozlovskii, K. I., Chistyakov, A. A., Номоев, Сергей Андреевич, Васильевский, Иван Сергеевич, Виниченко, Александр Николаевич, Козловский, Константин Иванович, Чистяков, Александр Александрович

© 2019 Elsevier LtdThis work reports on an advanced approach to the design of THz photoconductive. antenna (PCA). The LT-GaAs thin films used for the PCA fabrication were synthesized by MBE method on GaAs (100) substrate by adjusting the As pressure, As/Ga fluxes ratio, growth/annealing temperatures and annealing time. These parameters crucially affect electro-optical properties of the PCA samples as evidenced by the THz radiation power and time-domain spectroscopy measurements. The annealing temperature of 670 °C was found to be optimal for constructing a PCA possessing high amplitude of the THz radiation over the spectral range up to 1 THz at the resonance of 0.1 THz. The comparison of this PCA with the reference ZnTe crystal reveals a 2-fold increase in THz power. Furthermore, this antenna attains a 1.5-, 3-, and 2-fold increase in THz power, photocurrent efficiency, and actuating dc BV, as compared with the commercial ZOMEGA antenna. These results pave the way towards the creation of highly efficient LT-GaAs-based PCAs.

2019, Akmalov, A. E., Aksenov, E. A., Kotkovskii, G. E., Kozlovskii, K. I., Maksimov, E. M., Plekhanov, A. A., Chistyakov, A. A., Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Максимов, Евгений Михайлович, Плеханов, Андрей Александрович, Чистяков, Александр Александрович

© 2019 SPIE.The work is devoted to the influence of scattering of terahertz (THz) radiation by hexogen particles (RDX) in powdery samples on their transmission and reflection spectra. A terahertz radio-vision installation with spectral resolution was used to determine experimentally THz spectra of RDX. For samples with small RDX particles (the typical particle size is 100 μm), characteristic peaks at 0.8 THz and 1.06 THz are observed in absorption spectra despite scattering, that can be used to identify this substance. For large hexogen particles (a typical particle size is 450 μm), experiments and numerical simulation showed that even the most intense peak at 0.8 THz is not observed in absorption spectra, and the spectra are mainly due to the scattering effect and its depending on the wavelength of radiation. The reflection spectra of RDX layers (particle size is about 100 μm) qualitatively differ from the reflection spectra of RDX crystals and are formed as a result of absorption during propagation of THz radiation in the particle layer. Thus, the substance can be identified by absorption spectra in a reflection scheme.

2022, Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Maximov, E. V., Martynov, I. L., Osipov, E. V., Plekhanov, A. A., Kuzishchin, Yu. A., Chistyakov, A. A., Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Максимов, Евгений Михайлович, Мартынов, Игорь Леонидович, Осипов, Евгений Валерьевич, Плеханов, Андрей Александрович, Кузищин, Юрий Александрович, Чистяков, Александр Александрович

2024, Vovchenko, E. D., Kozlovskii, K. I., Pleshakova R. P., Rukhman A. A., Shikanov, A., Вовченко, Евгений Дмитриевич, Козловский, Константин Иванович, Шиканов, Александр Евгеньевич

2020, Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Maksimov, E. M., Plekhanov, A. A., Chistyakov, A. A., Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Максимов, Евгений Михайлович, Плеханов, Андрей Александрович, Чистяков, Александр Александрович

© 2020 SPIEThe presence of characteristic peaks in the terahertz (THz) absorption spectra of many organic substances and the active development of the technology for manufacturing video cameras based on microbolometric matrices create an increased interest in methods for identifying explosive compounds using THz imaging with simultaneous recording of spectral information. The results of relevant studies can be used in the development of security systems. THz images (taking into account the spectral information in each pixel) were obtained in this work by passing radiation through a sample based on hexogen (RDX) microcrystals deposited on a polyethylene (PE) film. A photoconductive antenna was used as a source of broadband radiation in the range from 0.5 THz to 2.5 THz. Spectral resolution was provided using a Fourier spectrometer based on a Michelson interferometer. The images were recorded using a THz video camera based on a microbolometric matrix. The possibility of identifying RDX microcrystals using color visualization of spectral information in the frequency range of one of the characteristic RDX peaks (~0.8 THz) has been demonstrated.

2021, Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Maksimov, E. M., Martynov, I. L., Osipov, E. V., Plekhanov, A. A., Kuzishchin, Yu. A., Chistyakov, A. A., Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Максимов, Евгений Михайлович, Мартынов, Игорь Леонидович, Осипов, Евгений Валерьевич, Плеханов, Андрей Александрович, Кузищин, Юрий Александрович, Чистяков, Александр Александрович

© 2021 SPIEThe presence of peculiarities in terahertz spectra of many organic compounds allows the use of THz imaging and spectroscopy for the detection of various hazardous and explosive substances. This work is devoted to the study of the detection of trace amounts of 1,3,5-Trinitro-1,3,5-triazinane (RDX) in the form of particles localized in millimeter and submillimeter sizes using THz imaging with spectral resolution. As a result of the work, images of trace amounts of RDX in reflected THz radiation were obtained. The contrast in these images made it possible to detect single particles of the powdery substance. The difference in contrast for RDX and polyethylene (PE) in the obtained terahertz images makes it possible to use THz imaging with spectral resolution not only for detection, but also for the identification of chemical compounds.

2023, Chistyakov, A. A., Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Maksimov, E. M., Martynov, I. L., Osipov, E. V., Kuzishchin, Yu. A., Plekhanov, A. A., Осипов, Евгений Валерьевич, Козловский, Константин Иванович, Котковский, Геннадий Евгеньевич, Мартынов, Игорь Леонидович, Максимов, Евгений Михайлович, Чистяков, Александр Александрович, Акмалов, Артём Эдуардович

An analysis of the current state of research and development in the fi eld of radiovision for the terahertz range of electromagnetic radiation was carried out in the work. Various sources of terahertz radiation are considered: photoconductive antennas, IMPATT diodes, Schottky diodes, and others, as well as modern video cameras for this range and their main characteristics for recording and studying THz images in various spectral regions. The results of studies of the intensity distribution in THz radiation beams at diff erent wavelengths for photoconductive antennas using THz radiovision, as well as the possibilities of studying scattering processes during refl ection and transmission of THz radiation for various materials, are presented.

2019, Vovchenko, E. D., Kozlovskii, K. I., Lisovskii, M. I., Rashchikov, V. I., Shikanov, A. E., Shatokhin, V. L., Вовченко, Евгений Дмитриевич, Козловский, Константин Иванович, Ращиков, Владимир Иванович, Шиканов, Александр Евгеньевич, Шатохин, Вадим Леонидович

© 2019, Springer Science+Business Media, LLC, part of Springer Nature.In order to use neutron generators in applied research, it is important to increase the energy efficiency of neutron generation. For high accelerating voltages, diodes with magnetic insulation are used to suppress electron emission from the cathode in neutron accelerator tubes. A mathematical model describing the dynamics of charged particles in the axial diode with insulation of electrons by the field of a permanent magnet is studied. The model is used to perform a computer experiment that shows a reduction of insulation near the ends of the magnet, which permits up to 40% of the electrons from the cathode to reach the anode of the accelerator tube. An option for making the magnetic insulation more efficient by adding into the magnetic system diaphragms placed in the end zones of a cylindrical cathode is proposed and studied.

2021, Vovchenko, E. D., Deryabochkin, O. V., Kozlovskii, K. I., Melekhov, A. P., Polozov, S. M., Shikanov, A. E., Вовченко, Евгений Дмитриевич, Дерябочкин, Олег Владимирович, Козловский, Константин Иванович, Мелехов, Андрей Петрович, Полозов, Сергей Маркович, Шиканов, Александр Евгеньевич

© 2021, Pleiades Publishing, Ltd.Abstract: The formation of ion fluxes of the laser plasma by axially symmetric magnetic fields is studied. An algorithm for forming ion fluxes is developed and a computer experiment is carried out. As a result of the computer and physical experiments, it is shown that ion packets with a duration exceeding several microseconds, which contain more than ~1012 particles at a flight distance of about 2 m, can be obtained at the output of a laser-plasma ion source.