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Лисица, Валерий Степанович

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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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Лисица

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Валерий Степанович

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Только метаданные
An analytical plasma screening potential based on the self-consistent-field ion-sphere model
(2019) Li, X.; Astapenko, V. A.; Rosmej, F. B.; Lisitsa, V. S.; Лисица, Валерий Степанович
© 2019 Author(s). The radial dependence of the free electron density within the ion sphere radius in finite temperature dense plasmas shows characteristic scaling laws that permit us to derive analytical plasma screening potentials. A generalized analytical approach is developed which shows good agreement with self-consistent quantum mechanical calculations. It is empirically discovered that anomalous strong scaling in the analytical model provides agreement with data obtained in a regime where the lattice structure still prevails.
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Stark-Zeeman and Blokhintsev Spectra of Rydberg Atoms
(2020) Letunov, A. Y.; Lisitsa, V. S.; Лисица, Валерий Степанович
The problem of Rydberg atomic spectra in crossed electric F and magnetic B fields (combined Stark-Zeeman effects), as well as an oscillating electric field are under consideration. The main problem is the great array of radiative transitions between the Rydberg atomic states. The different versions of semiclassical approaches are applied for the solution of the problem. New approximate selection rules are established to simplify the matrix elements of radiative transitions, making it possible to reduce the complex expressions of Gordon's hypergeometric series to the trivial trigonometric functions. Simple analytical formulas for the dipole matrix elements of a Rydberg hydrogen-like atom in external crossed electric and magnetic fields for H-n alpha are obtained. The specific calculations are presented for n = 10 to 9 transition both for parallel and perpendicular orientations of F-B fields. The result of Blokhintsev for a single Stark component in oscillating field is generalized for the array of radiative transitions between Rydberg atomic states. Such spectra with large values of modulation index are compared with static ones.
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Data for beryllium–hydrogen charge exchange in one and two centres models, relevant for tokamak plasmas
(2021) Sdvizhenskii, P. A.; Tolstikhina, I. Yu.; Tugarinov, S. N.; Lisitsa, V. S.; Kukushkin, A. B.; Лисица, Валерий Степанович; Кукушкин, Александр Борисович
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.Data on the cross section and kinetic rate of charge exchange (CX) between the bare beryllium nucleus, the ion Be(+4) and the neutral hydrogen atom are of great interest for visible-range high-resolution spectroscopy in the ITER tokamak because beryllium is intended as the material for the first wall in the main chamber. Here an analysis of available data is presented, and the data needs are formulated. Besides the active probe signal produced by the CX of the diagnostic hydrogen neutral beam with impurity ions in plasma, a passive signal produced by the CX of impurity ions with cold edge plasma is also important, as it shows in observation data from the JET (Joint European Torus) tokamak with an ITER-like beryllium wall. Data in the range of a few eV/amu to ~100 eV/amu (amu stands for the atomic mass unit) needed for simulations of level populations for principal and orbital quantum numbers in the emitting beryllium ions Be(+3) can be obtained with the help of two-dimensional kinetic codes. The lack of literature data, especially for data resolved in orbital quantum numbers, has instigated us to make numerical calculations with the ARSENY code. A comparison of the results obtained for the one-centre Coulomb problem using an analytic approach and for the two-centre problem using numerical simulations is presented.
Только метаданные
Effect of Thermodynamic Nonequilibrium of Hydrogen Recycling on the Charge-Exchange Spectroscopy of Tokamak Edge Plasma
(2023) Kukushkin, A. B.; Kukushkin, A. S.; Levashova, M. G.; Lisitsa, V. S.; Khusnutdinov, R. I.; Кукушкин, Александр Борисович; Лисица, Валерий Степанович; Хуснутдинов, Радмир Ильдарович
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Assessment of Multiplet Splitting and Line Radiation Imprisonment Effects during Discharge Quenching by Intense Argon Injection in ITER
(2024) Sdvizhenskii, P. A.; Kukushkin, A. B.; Levashova, M. G.; Lisitsa,V.S.; Кукушкин, Александр Борисович; Лисица, Валерий Степанович
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Thomson scattering in plasmas: Theory generalization for ultrashort laser pulse effects
(2020) Astapenko, V. A.; Khramov, E. S.; Rosmej, F. B.; Lisitsa, V. S.; Лисица, Валерий Степанович
© 2020 Author(s).The standard approach to calculate the Thomson scattering probability is reconsidered for the case of ultrashort incident laser pulses (USLPs). We established a new model for the interaction of USLP with plasmas that is based on Fermi's equivalent photon conception to calculate the spectral-angular differential Thomson scattering probability. The simulations demonstrate that the scattering probability for USLP is a non-monotonic function of pulse duration in contrast to the standard long-pulse model showing linear dependence. An analytical approach is developed to study the nonlinear behavior of the scattering probability as a function of pulse duration and other parameters.
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From the vector to scalar perturbations addition in the stark broadening theory of spectral lines
(2021) Astapenko, V.; Letunov, A.; Lisitsa, V.; Лисица, Валерий Степанович
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.The effect of plasma Coulomb microfied dynamics on spectral line shapes is under consideration. The analytical solution of the problem is unachievable with famous Chandrasekhar–Von-Neumann results up to the present time. The alternative methods are connected with modeling of a real ion Coulomb field dynamics by approximate models. One of the most accurate theories of ions dynamics effect on line shapes in plasmas is the Frequency Fluctuation Model (FFM) tested by the comparison with plasma microfield numerical simulations. The goal of the present paper is to make a detailed comparison of the FFM results with analytical ones for the linear and quadratic Stark effects in different limiting cases. The main problem is connected with perturbation additions laws known to be vector for small particle velocities (static line shapes) and scalar for large velocities (the impact limit). The general solutions for line shapes known in the frame of scalar perturbation additions are used to test the FFM procedure. The difference between “scalar” and “vector” models is demonstrated both for linear and quadratic Stark effects. It is shown that correct transition from static to impact limits for linear Stark-effect needs in account of the dependence of electric field jumping frequency in FFM on the field strengths. However, the constant jumping frequency is quite satisfactory for description of the quadratic Stark-effect. The detailed numerical comparison for spectral line shapes in the frame of both scalar and vector perturbation additions with and without jumping frequency field dependence for the linear and quadratic Stark effects is presented.
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ТЕРМОДИНАМИЧЕСКАЯ НЕРАВНОВЕСНОСТЬ РЕЦИКЛИНГА ВОДОРОДА В ПРИСТЕНОЧНОЙ ПЛАЗМЕ ТОКАМАКА И ЕЕ ВЛИЯНИЕ НА ПЕРЕЗАРЯДОЧНУЮ СПЕКТРОСКОПИЮ В ИТЭР
(НИЯУ МИФИ, 2023) КУКУШКИН, А. Б.; КУКУШКИН, А. С.; ЛЕВАШОВА, М. Г.; ЛИСИЦА, В. С.; НЕВЕРОВ, В. С.; ПШЕНОВ, А. А.; СДВИЖЕНСКИЙ, П. А.; ТОЛСТИХИНА, И. Ю.; ХУСНУТДИНОВ, Р. И.; СЕРОВ, С. В.; ТУГАРИНОВ, С. Н.; Хуснутдинов, Радмир Ильдарович; Кукушкин, Александр Борисович; Лисица, Валерий Степанович
Термодинамическая неравновесность рециклинга изотопов водорода в пристеночной плазме токамака состоит в существенном отклонении функции распределения по скоростям (ФРС) нейтральных атомов изотопов водорода от однотемпературной максвелловской ФРС. Такое отклонение впервые обнаружено в спектроскопических измерениях излучения плазмы в линиях бальмеровской серии водорода и дейтерия в токамаке Т-3 [1]. В настоящей работе проанализировано влияние указанной термодинамическая неравновесности на пассивный сигнал перезарядочной спектроскопии (CXRS-диагностики) периферийной плазмы в токамаках на примере ожидаемых условий в токамаке ИТЭР.
Только метаданные
Analysis of the Accuracy of Measuring the Flux Density of All Hydrogen Isotopes from First Wall to Plasma Using the H-Alpha Diagnostics in ITER
(2020) Kukushkin, A. B.; Neverov, V. S.; Lisitsa, V. S.; Shurygin, V. A.; Кукушкин, Александр Борисович; Лисица, Валерий Степанович
The results of the analysis of the accuracy of measuring the flux density of all hydrogen isotopes from the first wall of the main vacuum chamber to the ITER tokamak plasma using the high-resolution spectroscopy of Balmer alpha lines of hydrogen isotopes (H-alpha diagnostics) are presented. Under the conditions of the expected high background radiation generated by the divertor stray light and the absence of the possibility of using the optical dumps in ITER, a differential measurement scheme is necessary, which uses the spatial variation of the coefficient of the light reflection from the natural landscape of the first wall. The measurement accuracy analysis is carried out with the help of the method of synthetic diagnostics, which uses the results of the predictive numerical modeling of different modes of hydrogen recycling for simulation of the expected diagnostic signals and determination of the desired parameters by solving an inverse problem.
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Analysis of Unsteady Charge Kinetics of Helium in the Initial Phase of Plasma Discharge in LHD
(2025) Nagel, N. N.; Lisitsa, V. S.; Shurygin, V. A.; Лисица, Валерий Степанович