Персона: Маренков, Евгений Дмитриевич
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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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Маренков
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Евгений Дмитриевич
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- ПубликацияТолько метаданныеShielding of liquid metal targets in plasma of linear devices(2020) Marenkov, E. D.; Pshenov, A. A.; Kukushkin, A. S.; Маренков, Евгений Дмитриевич© 2020 Author(s).We apply a 0D model of shielding for simulations of liquid Li exposure experiments in He plasma of the Magnum-PSI linear device. The model accounts for all the most essential processes in the vapor cloud and plasma-surface interactions. The simulation results are in good agreement with the target surface temperature measurements. A factor of 10 increase in the erosion flux leads to a 100 °C decrease in the surface temperature, still giving a reasonable agreement with experiments. Therefore, the temperature measurements are inconclusive with respect to determining whether enhanced erosion takes place or not. We observe that only 10% of the eroded material is redeposited, while several other works suggest up to 99% redeposition. We show that low redeposition is a consequence of the low electron temperature, about 0.3 eV, in the vapor cloud and that the ratio of the ionization length to the transverse cloud size is the critical parameter to look at. Hence, the redeposition factor is not a universal quantity and can vary in quite a broad range depending on the plasma parameters and machine geometry.
- ПубликацияТолько метаданныеVapor shielding of liquid lithium divertor target during steady state and transient events(2020) Marenkov, E.; Pshenov, A.; Маренков, Евгений ДмитриевичWe develop a 0D model of vapor shielding including a vast variety of processes in the vapor cloud and plasma-surface interactions. The model is applied to a liquid lithium (Li) divertor with targets covered by a self-restoring Li coating. Calculations show that in the steady state, the target heat flux saturates with increasing external heat flux at approximately 7.5 MW m(-2). This value may seem very optimistic. However, we show that a significant part of the external heat is removed with the eroded particles. Hence, the maximum sustainable heat load is restricted by the coating renewal rate. The response of the coating to pulsed loads similar to the ITER-scale type I edge localized modes (ELMs) demonstrates high shielding efficiency. Similar to the steady-state regime, the coating renewal rate is the critical quantity for the target survival under pulsed heat loads. Surviving an ELM with an external heat load of 100 MW m(-2) requires a fast coating recovery rate (10(26) m(-2) s(-1)) or a substantial reservoir of Li on the surface, which may be a concern for some target designs.
- ПубликацияТолько метаданныеOn the role of hydrogen radiation absorption in divertor plasma detachment(2019) Krasheninnikov, S. I.; Pshenov, A. A.; Kukushkin, A. S.; Marenkov, E.; Маренков, Евгений ДмитриевичTransition to the detached divertor regime that allows lowering the peak power loads on the divertor targets to a tolerable level requires low plasma temperature T-e similar to 1 eV and high plasma density n(e) similar to 10(21) M-3 in front of the target. Under such conditions, radiation trapping of the Lyman lines of hydrogen isotopes becomes important. It can influence both energy balance and the ionization/recombination rates significantly. Nevertheless, opacity is typically neglected in the 2D edge transport codes used to study the divertor plasma detachment. We report on the first in-depth investigation of radiation opacity effects on transition to detachment. Simulations are performed with the SOLPS 4.3 code package using a DIII-D size tokamak as a particular example. It is found that in pure hydrogen plasma suppression of the neutral hydrogen radiation loss due to the photon absorption makes reaching the detached plasma regime more difficult. A significantly higher average separatrix plasma pressure is required to reach a similar degree of detachment. Adding plasma impurities compensates for the reduced neutral radiation and offsets the effect of opacity. In a carbon device, where the impurity source is due to erosion of the divertor components and is strongly connected to the edge plasma density, the absorbed fraction of the hydrogen radiation is easily compensated with the increasing carbon radiation loss. However, nowadays, in the more relevant case of the full-metal wall and seeded impurity with the feedback-controlled content, the increase of the edge plasma density alone is insufficient to compensate for trapping of the hydrogen radiation. In this case, achievement of the desired degree of detachment requires higher average separatrix plasma pressure or seeded impurity content than those obtained from the transparent plasma model.
- ПубликацияТолько метаданныеModeling the vapor shielding of a liquid lithium divertor target using SOLPS 4.3 code(2021) Marenkov, E. D.; Kukushkin, A. S.; Pshenov, A. A.; Маренков, Евгений ДмитриевичIn this letter, we report the very first results of SOLPS4.3 simulations of a liquid lithium (Li) divertor, including vapor shielding effects. A peculiarity of Li as a target coating material is the strong dependence of the erosion rate on the target temperature. We have implemented a new erosion model in SOLPS, taking this dependence into account. Simulations of the T15-MD tokamak divertor with Li-coated divertor targets have been performed. Li erosion is determined by physical sputtering, evaporation, and thermal sputtering. The results of the simulations show that a shielding effect occurs, providing a reduction of the target heat flux to values below 8 MW m(-2). At the same time, the upstream plasma dilution in the high-power regimes, where shielding is most efficient, is very strong, meaning that in practical terms, it may be difficult to rely on the shielding effect for heat flux control in the configuration considered.
- ПубликацияТолько метаданныеThe kinetic theory of prompt redeposition in the case of thin Debye sheath(2024) Marenkov, E. D.; Маренков, Евгений Дмитриевич
- ПубликацияТолько метаданныеSimulation of lithium flow, redeposition, and vapor shielding in liquid lithium divertor of T-15MD tokamak with SOLPS 4.3 code(2022) Marenkov, E. D.; Pshenov, A. A.; Kukushkin, A. S.; Маренков, Евгений Дмитриевич
- ПубликацияТолько метаданныеDiagnostics Complex of the First Wall and Divertor of Tokamak with Reactor Technologies: Control of Erosion and Temperature and Monitoring of Fusion Fuel Build-up(2022) Razdobarin, A. G.; Gasparyan, Yu. M.; Dmitriev, A. M.; Elets, D. I.; Bulgadaryan, D. G.; Krat, S. A.; Marenkov, E. D.; Гаспарян, Юрий Микаэлович; Елец, Денис Игоревич; Крат, Степан Андреевич; Маренков, Евгений Дмитриевич
- 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 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 метаданныеRecent Progress in Some Issues of Divertor Physics under Detachment Conditions(2023) Stepanenko, A. A.; Marenkov, E. D.; Pshenov, A. A.; Kukushkin, A. S.; Степаненко, Александр Александрович; Маренков, Евгений Дмитриевич