Персона: Синельников, Дмитрий Николаевич
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Дмитрий Николаевич
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- ПубликацияТолько метаданныеBuilt-In Surface Analyzer for Plasma Devices with Magnetic Field(2019) Bulgadaryan, D. G.; Sinelnikov, D. N.; Sorokin, I. A.; Kurnaev, V. A.; Efimov, N. E.; Синельников, Дмитрий Николаевич; Сорокин, Иван Александрович; Ефимов, Никита Евгеньевич© 2019, Pleiades Publishing, Ltd.The erosion and redeposition processes of plasma-facing materials in fusion devices are the most important factors affecting near-wall and core plasma parameters and device lifetime. To determine the possibility of in situ analyzing these processes, we developed an experimental model of a built-in surface analyzer utilizing low-energy proton scattering spectroscopy. The results of experimental approbation of the method are presented.
- ПубликацияТолько метаданныеNano-tendril bundles behavior under plasma-relevant electric fields(2021) Hwangbo, D.; Ohno, N.; Kajita, S.; Kulagin, V. V.; Sinelnikov, D. N.; Bulgadaryan, D. G.; Efimov, N. E.; Kurnaev, V. A.; Кулагин, Владимир Владимирович; Синельников, Дмитрий Николаевич; Ефимов, Никита Евгеньевич© 2020 Elsevier LtdThe appearance of unipolar arcs is a negative phenomenon that occurs among plasma-wall interaction processes in thermonuclear devices. Nano-tendril bundles (NTBs) can be formed on a plasma-facing surface of tungsten after irradiation by helium plasma that contains impurities of neon or nitrogen. These structures can increase the probability of unipolar arcing because of significant electron emission under a relatively small applied electric field of several kV/mm. The electron emission can appear due to sufficient field enhancement factor that can be up to several thousand. Furthermore, NTBs can be easily overheated, which leads to initiation of the thermofield emission, consequently triggering explosive emission because of intensive heating by Joule source, even without any additional external power load. This paper shows the results of the field enhancement factor estimations, as well as the critical field strength for NTBs when they can collapse because of explosive electron emission caused by Joule heating. The results were obtained by numerical simulations in COMSOL Multiphysics© and experimentally in a vacuum diode.
- ПубликацияТолько метаданныеUsing Laser-Induced Breakdown Spectroscopy and Mass Spectrometry to Determine the Retention of Deuterium in Titanium Films(2022) Efimov, N. E.; Sinelnikov, D. N.; Sinelnikov,D.N.; Bulgadaryan, D. G.; Gasparyan, Y. M.; Gasparyan,Y.M.; Ефимов, Никита Евгеньевич; Синельников, Дмитрий Николаевич; Гаспарян, Юрий Микаэлович; Вовченко, Евгений Дмитриевич; Крат, Степан Андреевич© 2022, Allerton Press, Inc.Abstract: The sensitivities of laser-induced breakdown spectroscopy and quadrupole mass spectrometry are compared to determine the deuterium retained in titanium films using a nanosecond Nd:YAG laser. Simultaneous measurements are made in the 1–18 J cm−2 range of energy densities. Considerably higher sensitivity of mass spectrometry is revealed, along with the possibility of non-destructive analysis at low energy densities.
- ПубликацияТолько метаданныеThe influence of the adiabatic index on the radiation dynamics of self-similar expanding laser-produced plasma plume(2022) Marenkov, E. D.; Sinelnikov, D. N.; Efimov, N. E.; Bulgadaryan, D. G.; Gasparyan, Y. M.; Маренков, Евгений Дмитриевич; Синельников, Дмитрий Николаевич; Ефимов, Никита Евгеньевич; Гаспарян, Юрий Микаэлович© 2022 Author(s).The radiation dynamics of an adiabatic self-similar expanding spherical plasma plume is considered. It is shown that the radiation intensities evolution strongly depends on the adiabatic index γ. For example, it is proven that the radiation intensity in a highly ionized plasma plume increases over time if γ= 5/3 and has a minimum in time if γ< 5/3. The analytical results are compared to measurements of the radiation from lithium laser-produced plasma. A lithium sample was irradiated by a powerful (42 J/cm2) laser pulse, and radiation of produced lithium plasma was registered by a monochromator. Reasonable agreement with the experiments is reached for γ= 5/4.
- ПубликацияТолько метаданныеOn the Possibility of Surface Analysis by keV-Energy Proton Scattering in Magnetic Fusion Devices(2020) Kurnaev, V.; Bulgadaryan, D. G.; Sinelnikov, D. N.; Синельников, Дмитрий Николаевич© 2020, Pleiades Publishing, Ltd.Abstract: The processes of erosion and redeposition of plasma-facing materials in fusion devices are some of the most important factors affecting the plasma parameters and the resource of the first wall. The method of analyzing thin layers on a surface using keV-energy proton scattering expands the functionality of determining the rate of erosion and deposition of layers with a large atomic number on a substrate of a light element or, conversely, light layers on a heavy substrate, which is typical of modern fusion installations. The analysis of deposition and/or erosion consists in placing special marker targets with the layers of a material with a low atomic number and/or material with a large atomic number in the places of the installation in which it is proposed to study the rate of erosion and/or deposition, with a subsequent analysis of the energy spectra of hydrogen ions reflected from exposed targets with energies in the kiloelectron-volt range. In this paper, estimates of the applicability of this technique directly in a fusion device with regard to the characteristic parameters of the near-edge plasma are given.
- ПубликацияТолько метаданныеAnalysis of the Influence of Laser Surface Irradiation Regimes in the Diagnostics of Hydrogen Isotope Retention(2023) Efimov, N. E.; Sinelnikov, D. N.; Grishaev, M. V.; Gasparyan, Y. M.; Efimov, V. S.; Krat, S.; Ефимов, Никита Евгеньевич; Синельников, Дмитрий Николаевич; Гришаев, Максим Валерьевич; Гаспарян, Юрий Микаэлович; Ефимов, Виталий Сергеевич; Крат, Степан Андреевич
- ПубликацияТолько метаданныеDynamics of lithium plasma in laser-induced breakdown spectroscopy(2023) Marenkov, E. D.; Kim, D. A.; Efimov, N. E.; Sinelnikov, D. N.; Gasparyan, Yu. M.; Маренков, Евгений Дмитриевич; Ефимов, Никита Евгеньевич; Синельников, Дмитрий Николаевич; Гаспарян, Юрий Микаэлович
- ПубликацияТолько метаданныеAnalysis of Craters in Tungsten Films Irradiated with Picosecond Laser Pulses for Laser-Assisted Surface Diagnostics(2024) Efimov, N. E.; Sinelnikov, D. N.; Grishaev, M. V.; Gasparyan, Y. M.; Krat, S. A.; Sorokin, I. A.; Ефимов, Никита Евгеньевич; Синельников, Дмитрий Николаевич; Гришаев, Максим Валерьевич; Гаспарян, Юрий Микаэлович; Крат, Степан Андреевич; Сорокин, Иван Александрович
- ПубликацияТолько метаданныеOptimizing Cache Memory Usage Methods for Chat LLM-models in PaaS Installations(2024) Rovnyagin, M. M.; Sinelnikov, D. N.; Eroshev, A. A.; Rovnyagina, T. A.; Tikhomirov, A. V.; Ровнягин, Михаил Михайлович; Синельников, Дмитрий Николаевич; Ерошев, Артём Александрович; Тихомиров, Александр Владимирович; Ровнягина, Татьяна Александровна
- ПубликацияТолько метаданныеUsing the Scattering Spectroscopy of keV-Energy Protons to Analyze the Deposition of Lithium on Tungsten(2020) Bulgadaryan, D. G.; Sinelnikov, D. N.; Efimov, N. E.; Kurnaev, V. A.; Синельников, Дмитрий Николаевич; Ефимов, Никита Евгеньевич© 2020, Allerton Press, Inc.Abstract: Controlling the thickness of thin layers of lithium when they are deposited on plasma-facing elements is an important task in the field of plasma-surface interaction in fusion devices. It is shown the keV‑energy proton scattering spectroscopy can be used for this purpose. The sensitivity of technique to chemical reactions on a surface is demonstrated, and estimates of the charge state of hydrogen ions reflected from a lithium surface are given.