Персона: Лобода, Петр Анатольевич
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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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Петр Анатольевич
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- ПубликацияОткрытый доступОб учете эффектов ионной динамики при моделировании спектров многозарядных ионов(2024) Летунов, А. Ю.; Лисица, В. С.; Лобода, П. А.; Новиков, А. А.; Лобода, Петр АнатольевичИсследуется влияние теплового движения ионов на спектры многозарядных ионов в плотной плазме. Получено аналитическое выражение для частоты скачков амплитуды ионного микрополя. Предложена модификация методики Frequency Fluctuation Model, позволяющая учесть зависимость частоты скачков ионного микрополя от сдвига энергии. Представлен новый подход к диагностике плотности плазмы по площади провала в центре спектральных линий. Приведены расчеты спектров примеси аргона в дейтериевой плазме.
- ПубликацияТолько метаданныеIonization balance of non-LTE plasmas from an average-atom collisional-radiative model(2022) Ovechkin, A. A.; Loboda, P. A.; Korolev, A. S.; Kolchugin, S. V.; Vichev, I. Y.; Solomyannaya, A. D.; Kim, D. A.; Grushin, A. S.; Лобода, Петр АнатольевичWe present a simplified version of an average-atom collisional-radiative model employing both local-thermodynamic-equilibrium average-atom and isolated-ion atomic data. The simplifications introduced do not lead to any substantial errors, and they significantly speed up calculations compared with the basic average-atom model involving direct solution of the self-consistent-field equations. Average ion charges, charge state distributions, and emission spectra of non-local-thermodynamic-equilibrium (NLTE) gold plasmas calculated using various modifications of the average-atom collisional-radiative model are compared with those obtained using the THERMOS model with the detailed configuration accounting approach. We also propose an efficient method to calculate thermodynamic functions of NLTE plasmas in the context of the simplified average-atom collisional-radiative model.
- ПубликацияТолько метаданныеPseudoatom Molecular Dynamics Method for Calculating the Coefficients of Viscosity and Ion Self-Diffusion in a Dense Plasma(2022) Falkov, A. L.; Ovechkin, A. A.; Loboda, P. A.; Ivliev, S. V.; Лобода, Петр Анатольевич; Ивлиев, Сергей Владимирович© 2022, Pleiades Publishing, Inc.Abstract: A semiclassical version of the pseudoatom molecular dynamics method is used to calculate the coefficients of dynamic viscosity and ion self-diffusion of a warm and moderately heated dense plasma of a number of chemical elements, which are of interest for the high-energy-density physics, the solution of a number of applied geophysical and planetology problems, and a comparison with the calculated data of other authors. The effects caused by the Coulomb interaction in a medium and the quantum properties of the electronic subsystem of plasma are taken into account. Analytical approximations are proposed for the coefficients of viscosity and ion self-diffusion, and they can be used to simulate the dynamics of dense ionized matter for describing experiments in the high-energy-density physics.
- ПубликацияТолько метаданныеOn Considering the Effects of Ion Dynamics In Modeling the Spectra of Multicharged Ions(2023) Letunov, A.; Lisitsa, V. S.; Loboda, P. A.; Novikov, A. A.; Лисица, Валерий Степанович; Лобода, Петр Анатольевич
- ПубликацияТолько метаданныеPlasma ionization balance in chemical-picture and average-atom models(2023) Ovechkin, A. A.; Loboda, P. A.; Popova, V. V.; Akulinina, E. Yu.; Лобода, Петр Анатольевич
- ПубликацияТолько метаданныеEquation of state modeling with pseudoatom molecular dynamics(2021) Ovechkin, A. A.; Falkov, A. L.; Sapozhnikov, P. A.; Loboda, P. A.; Лобода, Петр Анатольевич© 2021 American Physical Society.Using a modified version of the pseudoatom molecular-dynamics approach, the silicon and oxygen equations of state were generated and then employed to construct the equation of state of silicon dioxide. The results are supported by the close agreement with ab initio simulations of the silicon pressure and experimental shock Hugoniot of silicon dioxide. Ion thermal contributions to thermodynamic functions provided by the PAMD simulations are compared to their counterparts obtained with the one-component plasma and charged-hard-sphere approximations.
- ПубликацияТолько метаданныеDescription of the Stark Broadening of Spectral Lines in Plasmas Taking into Account the Nonstationary Ion Microfield within the Theory of Markov Processes(2024) Letunov, A. Y.; Lisitsa, V. S.; Loboda, P. A.; Novikov, A. A.; Лобода, Петр Анатольевич
- ПубликацияТолько метаданныеNonempirical approximation for the ionic thermal contribution to the equations of state based on average-atom models(2025) Ovechkin, A. A.; Loboda, P. A.; Sapozhnikov, P. A.; Лобода, Петр Анатольевич
- ПубликацияОткрытый доступA Decade with VAMDC: Results and Ambitions(2020) Albert, D.; Antony, B. K.; Ba, Y. A.; Babikov, Y. L.; Loboda, P. A.; Skobelev, I. Y.; Лобода, Петр Анатольевич; Скобелев, Игорь ЮрьевичThis paper presents an overview of the current status of the Virtual Atomic and Molecular Data Centre (VAMDC) e-infrastructure, including the current status of the VAMDC-connected (or to be connected) databases, updates on the latest technological development within the infrastructure and a presentation of some application tools that make use of the VAMDC e-infrastructure. We analyse the past 10 years of VAMDC development and operation, and assess their impact both on the field of atomic and molecular (A&M) physics itself and on heterogeneous data management in international cooperation. The highly sophisticated VAMDC infrastructure and the related databases developed over this long term make them a perfect resource of sustainable data for future applications in many fields of research. However, we also discuss the current limitations that prevent VAMDC from becoming the main publishing platform and the main source of A&M data for user communities, and present possible solutions under investigation by the consortium. Several user application examples are presented, illustrating the benefits of VAMDC in current research applications, which often need the A&M data from more than one database. Finally, we present our vision for the future of VAMDC.
- ПубликацияОткрытый доступPlasma opacity calculations using the Starrett and Saumon average-atom model with ion correlations(2019) Ovechkin, A. A.; Loboda, P. A.; Falkov, A. L.; Лобода, Петр Анатольевич© 2019 Elsevier B.V. We present the opacities of iron, aluminum, and bromine plasmas calculated using the Starrett and Saumon average-atom model allowing for ion correlations. We show that the use of earlier average-atom ion-correlation model of Rozsnyai, as has recently been done in the solar opacity calculations, overestimates the effect of ion correlations on plasma opacities. The reason for this overestimation is discussed.