Персона: Урюпин, Сергей Александрович
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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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Урюпин
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Сергей Александрович
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- ПубликацияТолько метаданныеWaves in plasma formed by above-threshold ionization of gas atoms(2019) Vagin, K. Y.; Mamontova, T. V.; Uryupin, S. A.; Мамонтова, Татьяна Вячеславовна; Урюпин, Сергей Александрович© 2019In the regime of above-threshold ionization of gas atom in the field of laser radiation, plasma with photoelectron distribution consisting of peaks at discrete energy values is formed. It is shown that the number of longitudinal waves in such plasma coincides with the number of peaks in the distribution function. When peaks practically don't overlap, the dispersion law of each wave in the region of short waves is determined by electrons from the corresponding peak. In this case the phase and group velocities of the waves are close to the electron velocity, which corresponds to the peak maximum. It is possible to talk about such waves as an electronic sound, since the perturbations of the electron density mainly arise due to pressure perturbations. When the peaks are narrow, but having a finite width, the Cherenkov damping of waves is exponentially small. Numerical calculations the dispersion laws for of the two and four waves in photoionized xenon plasma, in which the electron distribution function consists of two or four narrow peaks are given.
- ПубликацияТолько метаданныеAbsorption of Radiation with a Frequency Close to the Transparency Boundary of an Inhomogeneous Plasma Formed by Multiphoton Ionization of Inert Gas Atoms(2022) Vagin, K. Y.; Mamontova, T. V.; Uryupin, S. A.; Мамонтова, Татьяна Вячеславовна; Урюпин, Сергей Александрович
- ПубликацияТолько метаданныеReflection and absorption of electromagnetic radiation by inhomogeneous photoionized plasma, produced by multiphoton ionization of inert gas atoms(2021) Vagin, K. Y.; Mamontova, T. V.; Uryupin, S. A.; Мамонтова, Татьяна Вячеславовна; Урюпин, Сергей Александрович©2021 American Physical SocietyThe interaction of electromagnetic radiation with inhomogeneous plasma formed by multiphoton ionization of inert gas atoms has been studied. In high-frequency and normal skin effects modes the field structure in plasma is described and reflection and absorption coefficients are found. It is shown that as the thickness of the plasma region, in which the photoelectron density grows linearly, increases, both the depth of field penetration and the absorption coefficient increase, too. It is found that, due to the Ramzauer-Townsend effect, there is a relative increase in the effective frequency of photoelectron collisions with atoms, which is accompanied by a significant increase in the absorption coefficient.
- ПубликацияОткрытый доступHigh-frequency skin effect in a photoionized inert gas plasma(2020) Vagin, K. Yu.; Mamontova, T. V.; Uryupin, S. A.; Мамонтова, Татьяна Вячеславовна; Урюпин, Сергей Александрович© 2020 Published under licence by IOP Publishing Ltd.The penetration of a monochromatic electromagnetic wave into the weakly ionised plasma formed by multiphoton ionization of inert gas atoms has been studied. It is shown how the type of dependence of the photoelectron collision frequency on their velocity determines transverse permettivity in plasma. Explicit expressions for the absorption coefficient in inert gases at different probe radiation frequencies are obtained. In the high-frequency skin effect mode, the possibility of the absorption coefficient increasing due to the Ramsauer-Townsend effect has been demonstrated with argon as an example.