Персона: Сорокин, Иван 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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Иван Александрович
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- ПубликацияОткрытый доступФОРМИРОВАНИЕ МОНОЭНЕРГЕТИЧНОГО ИОННОГО ПОТОКА ИЗ ПЛАЗМЫ НА ДИЭЛЕКТРИЧЕСКИЙ ОБРАЗЕЦ(НИЯУ МИФИ, 2015) Подоляко, Ф. С.; Сорокин, И. А.; Гуторов, К. М.; Визгалов, И. В.; Шустин, Е. Г.; Гуторов, Константин Михайлович; Подоляко, Федор Сергеевич; Сорокин, Иван АлександровичThe method for producing ion flux with low energy spread for the treatment of dielectric samples is proposed. It is based on plasma potential control for the purpose of maintaining a constant voltage drop between the plasma and surface of the dielectric accumulating a charge. The first experiments on irradiation of dielectric samples in the PR-2 were performed and the energy spectra of ions were measured.
- ПубликацияОткрытый доступANALYSIS OF ION FLUXES IN LINEAR PLASMA DEVICES(НИЯУ МИФИ, 2015) Sorokin, I. A.; Vizgalov, I. V.; Bidlevich, O. A.; Сорокин, Иван АлександровичAnalysis of both ion mass-spectrum and plasma parameters is very important for plasma-surface interaction experiments to control discharge regime and ion composition. In linear plasma devices with a magnetic field, it is possible to apply a static mass-spectrometer using magnetic field of plasma device to ion separation with focusing at 180 or 360 degree.
- ПубликацияОткрытый доступLEIS ANALYSIS OF THE W SURFACE DURING WATER VAPOR ADSORPTION(НИЯУ МИФИ, 2017) Mamedov, N. V.; Kurnaev, V. A.; Sinelnikov, D. N.; Kolodko, D. V.; Sorokin, I. A.; Мамедов, Никита Вадимович; Колодко, Добрыня Вячеславич; Синельников, Дмитрий Николаевич; Сорокин, Иван АлександровичThe adsorption of water on the surface is one of the main problems in vacuum technology. Since water is a good adsorbent, its adsorption is the reason that prevents the fast pumping of vacuum systems up to ultra-high vacuum. In addition, water vapor adsorption on metal surfaces during plasma surface interaction is a problem [1]. Singly scattered and recoil ions could form narrow peaks in energy spectra and provide information about atomic composition of the first atomic layer giving information about structure and composition of the surface and very sensitivity to the first layer of atoms [2 -5]. It was also shown [6] that the thickness of light element thin layers on the heavy substrate can be analyzed with good depth resolution (~0,3nm) due to scattering of hydrogen ions with keV energies. Application of ion scattering spectroscopy at pressures up to several mTorr is presented in [7, 8]. In this work experimental results of low energy ion spectroscopy (LEIS) of W samples during water vapor adsorption are presented.
- ПубликацияОткрытый доступANGULAR DISTRIBUTION OF W SPUTTERED BY LOW ENERGY AR(НИЯУ МИФИ, 2017) Sorokin, I.; Marenkov, E.; Nordlund, K.; Eksaeva, A.; Маренков, Евгений Дмитриевич; Сорокин, Иван АлександровичSputtering of the first wall tokamak materials by low energy of the order of 100 eV but high fluxes, 1020 cm-2s-1 is one of the main mechanisms responsible for steady-state first wall erosion. At such low energies sputtering occurs due to few-collision cascades. The resulting angular and energy distributions of sputtered particles are different from cosine and Thompson distributions predicted by kinetic theory of cascades valid at larger energies. Experimental data on the distributions for materials and energies of interest are scarce [1]. At the same time experiments at linear plasma devices demonstrated that the distributions play a substantial role in comprehension of the sputtered particles transport in plasma [2]. In this work we develop an experimental procedure for direct measurements of the angular distributions of the sputtered particles and a method for molecular dynamics calculation of them. The proposed simulation procedure accurately accounts for polycrystalline structure of the samples.
- 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.
- ПубликацияОткрытый доступSTUDY OF PLASMA INTERACTION WITH FUSION REACTOR MATERIALS AT THE LINEAR SIMULATOR WITH A BEAM-PLASMA DISCHARGE(НИЯУ МИФИ, 2015) Gutorov, K.; Vizgalov, I.; Podolyako, F.; Sorokin, I.; Подоляко, Федор Сергеевич; Сорокин, Иван Александрович; Гуторов, Константин МихайловичLinear simulators with electron beam driven generation of plasma have some advantages for plasma-surface interaction investigations. Key features of such installations are considered on the example of the PR-2 simulator [1] in Moscow. This plasma beam machine with a longitudinal magnetic field and the electron beam generated plasma has a total power of 50 kW in a steady state regime, which allows target loading with several megawatts per square meter and intensive hydrogen ion fluxes (1022 m-2s-1). A set of diagnostic systems of the installation allows characterizing in details the processes in plasma: Langmuir and magnetic probes, ion composition and energy analysis, plasma emission spectrometry, gas composition spectrometry, IR camera. The PR-2 setup is presented in figure 1.
- ПубликацияТолько метаданныеSelf-Oscillating Mode of a Probe with Increased Secondary Emission for Nonequilibrium Plasma Diagnostics(2019) Vizgalov, I. V.; Gutorov, K. M.; Kurnaev, V. A.; Sorokin, I. A.; Гуторов, Константин Михайлович; Сорокин, Иван Александрович© 2019, Pleiades Publishing, Ltd.A method of ion saturation current measurement in a nonequilibrium plasma by a self-oscillating voltage sweep on the probe is described. The generation of voltage pulses is possible if a high secondary electron emission from the probe surface is ensured, significantly exceeding unity at a moderate negative potential. The theoretical basis of the self-oscillating probe method has been considered, which made it possible to describe the ways for controlling the repetition rate and pulse amplitude and the effect of plasma parameters on the shape of current and voltage signals. It is shown that the features of the phase trajectory of the signal from the probe on the (U, I) plane allow one to determine the reference points of instantaneous probe characteristic, in particular, the ion saturation current. The results of experiments on testing the self-oscillating probe technique, which were carried out using the PR-2 plasma-beam facility, are presented.
- ПубликацияОткрытый доступДиагностика примеси воды в замагниченной плазме(НИЯУ МИФИ, 2017) Сорокин, И. А.; Сорокин, Иван Александрович; Визгалов, И. В.