2019, Vovchenko, E. D., Kozlovskij, K. I., Shikanov, A. E., Karimov, A. R., Isaev, A. A., Plekhanov, A. A., Deryabochkin, O. V., Вовченко, Евгений Дмитриевич, Козловский, Константин Иванович, Шиканов, Александр Евгеньевич, Каримов, Александр Рашатович, Плеханов, Андрей Александрович, Дерябочкин, Олег Владимирович

© 2019, Pleiades Publishing, Ltd.The collective acceleration of laser plasma ions in a magnetic field generated by a powerful fast-growing current pulse in a low-inductive conical spiral is studied. The velocity of ions for a number of elements which significantly differ in atomic weight are obtained on the basis of collector measurements. The maximum velocity of both light (lithium) and heavy (lead) ions exceed the value of 108 cm/s; for ions of lead, the corresponding energy amounts to a value of ∼1 MeV. A mathematical model of ion acceleration is proposed and simulation results are compared with the experiment.

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.

2019, Melekhov, A. P., Ananin, O. B., Vovchenko, E. D., Komaretsky, V. V., Ramakoti, R. S., Мелехов, Андрей Петрович, Вовченко, Евгений Дмитриевич, Рамакоти, Рави Шрираджа

© 2019 IOP Publishing Ltd. All rights reserved.The relationship between the parameters of the ion component of vacuum spark plasma with a laser initiation and the power of the studied plasma terahertz radiation was experimentally investigated. For this purpose, ion fluence was studied using a time-of-flight mass spectrometer with a magnetic analyzer. Analysis of the ion mass spectra suggested a non-linear power-law dependence of the terahertz radiation power on the electron concentration in the spark plasma. The experimental results are compared with the results of studying the generation of terahertz radiation in beam-plasma experiments.

2023, Grishaev, M. V., Efimov, N. E., Sinelnikov, D. N., Nikitin, I. A., Gasparyan, Y. M., Vovchenko, E. D., Вовченко, Евгений Дмитриевич, Синельников, Дмитрий Николаевич, Ефимов, Никита Евгеньевич, Гришаев, Максим Валерьевич, Гаспарян, Юрий Микаэлович, Никитин, Иван Андреевич

One of the most detrimental phenomena in fusion research is the interaction of plasma with a surface of a first wall and in-chamber elements. It causes erosion of the plasma-facing components (PFC), which in turn results in a degradation of plasma parameters due to transport of erosion products into the hot plasma. On the other hand, these processes cause re-deposition of the eroded material together with fuel components (deuterium and tritium). This is the dominant mechanism for fuel retention in PFC.

2019, Shikanov, A. E., Vovchenko, E. D., Kozlovskij, K. I., Shatokhin, V. L., Шиканов, Александр Евгеньевич, Вовченко, Евгений Дмитриевич, Козловский, Константин Иванович, Шатохин, Вадим Леонидович

The acceleration of a plasmoid, for the formation of which a conical spiral expanding in the direction of the expected plasma acceleration is used, in a rapidly increasing magnetic field of complex geometry has been considered. An algorithm for calculating the longitudinal magnetic field in the approximation of replacing a spiral line with a system of rings of variable radius has been presented. A mathematical model that is based on the interaction of the plasmoid magnetic moment with gradient of the longitudinal magnetic field decay has been proposed to analyze the efficiency of the acceleration. The possibility of deuterons reaching an average speed exceeding 10(6) m/s has been shown.

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%.

2021, Efimov, N. E., Sinelnikov, D. N., Bulgadaryan, D. G., Gasparyan, Y. M., Vovchenko, E. D., Marenkov, E. D., Маренков, Евгений Дмитриевич, Ефимов, Никита Евгеньевич, Вовченко, Евгений Дмитриевич, Синельников, Дмитрий Николаевич, Гаспарян, Юрий Микаэлович

One of the critical issues on the way to controlled nuclear fusion is related to plasma wall interaction. Such interaction leads to co-deposition of hydrogen isotopes together with eroded first wall materials. It is known that the deuterium-tritium (DT) mixture will be used in ITER and future fusion devices as a fuel. So as the accumulation of radioactive tritium in the machines is limited by the nuclear license, there is a need for some remote fuel retention monitoring system. In current devices, the total fuel amount is determined from the gas balance (difference between input and output flows) measurements and from a post mortem analysis of plasmafacing components. One of the most promising techniques which can be applied in situ in tokamaks is based on laser irradiation of the surface of interest followed by mass- or optical spectroscopy. Such a technique was already applied in TEXTOR tokamak to the hydrogenic carbon layers [1], and it is included in the task list of ITER with a high priority.

2019, Vovchenko, E. D., Krat, S. A., Kostyushin, V. A., Khar'kov, M. M., Bulgadaryan, D. G., Prishvitsyn, A. S., Stepanova, T. V., Kurnaev, V. A., Zakharov, L. E., Вовченко, Евгений Дмитриевич, Крат, Степан Андреевич, Харьков, Максим Михайлович, Пришвицын, Александр Сергеевич, Степанова, Татьяна Владимировна

© 2019, Pleiades Publishing, Ltd.The paper reports results of studying the geometry of craters formed by the action of laser pulses on solid-state targets of aluminum and lithium films at a power density on the target of (1–5) × 1010 W/cm2 and variation of the number of pulses in the range of 1–150, as well as the results of ex situ layer-by-layer analysis of lithium films on quartz coatings carried out using the method laser induced breakdown spectroscopy to determine the thickness of the films.