Персона: Кузнецов, Андрей Петрович
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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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- ПубликацияОткрытый доступСИСТЕМА ЛАЗЕРНОЙ ОЧИСТКИ ПОВЕРХНОСТИ ЗЕРКАЛ ОПТИЧЕСКИХ ДИАГНОСТИК НА ИТЭР(НИЯУ МИФИ, 2015) Савченков, А. В.; Губский, К. Л.; Кузнецов, А. П.; Никитина, Е. И.; Тугаринов, С. Н.; Бужинский, О. И.; Кузнецов, Андрей Петрович; Губский, Константин ЛеонидовичThe development of cleaning optics and deposition-mitigating techniques is a key factor in the construction and operation of optical diagnostics in ITER. It has been shown that high initial reflection characteristics of optical elements can be recovered by choosing regimes of fiber laser radiation effect on the deposited surface. Experiments on transport of fiber laser radiation to the metal mirror by using system of lens and cleaning showed the possibility of a hardware implementation of methods applicable in the geometry of port-plug ITER.
- ПубликацияОткрытый доступСПОСОБ СОЗДАНИЯ ВЫСОКОАСПЕКТНЫХ ПРОТЯЖЕННЫХ СТРУКТУР С ДИАМЕТРАМИ СУБМИКРОННЫХ РАЗМЕРОВ В ДИЭЛЕКТРИЧЕСКОМ КРИСТАЛЛЕ ФЕМТОСЕКУНДНЫМИ РЕНТГЕНОВСКИМИ ИМПУЛЬСАМИ(НИЯУ МИФИ, 2024) Пикуз, С. А.; Макаров, С. С.; Пикуз, Т. А.; Кузнецов, А. П.; Кузнецов, Андрей ПетровичИзобретение относится к нанотехнологиям и микроструктурным технологиям. Сущность изобретения заключается в том, что способ создания протяженных полостей с диаметрами субмикронных размеров в кристалле LiF с помощью когерентных рентгеновских импульсов заключается в прошивке отверстия в кристалле LiF лазерным методом за счет наведения фокального пятна на поверхность кристалла и перемещения этого пятна с микронной точностью по поверхности кристалла, при этом для получения глубоких полостей с диаметрами субмикронных размеров в кристалле LiF используют когерентные фемтосекундные (20 фс) рентгеновские импульсы с длиной волны фотонов λ, равной 1,3776 Å, при которой длина затухания в структуре LiF равна 475 мкм. Изобретение обеспечивает возможность упрощения способа создания протяженных полостей субмикронного диаметра с аспектным соотношением порядка 1:1800 в кристалле LiF для создания фотонных кристаллов и фотонных волноводов. 1 з.п. ф-лы, 4 ил., 1 пр.
- ПубликацияТолько метаданные3D push–pull heterodyne interferometer for SPM metrology(2019) Kazieva, T. V.; Gubskiy, K. L.; Kuznetsov, A. P.; Reshetov, V. N.; Казиева, Татьяна Вадимовна; Губский, Константин Леонидович; Кузнецов, Андрей Петрович; Решетов, Владимир Николаевич© 2019 Optical Society of America.A three-coordinate heterodyne laser interferometer has been developed to measure the displacement of the probe microscope scanner with a subnanometer resolution that provides traceability of measurements to the standard of meter through the wavelength of a stabilized He–Ne laser. Main sources of errors are investigated, and their influence is minimized so that the resulting measurement uncertainty of the system does not exceed 0.2 nm, and the resolution is 0.01 nm. The investigation of metrological characteristics of the three-coordinate interferometer was carried out with a scanning probe microscopy (SPM) NanoScan-3D using TGZ-type calibration gratings. The values measured with SPM fell within the 95% confidence interval given by Physikalisch-Technische Bundesanstalt (PTB) (Germany). SPM equipped with a laser interferometer was used to measure the characteristics of dynamic etalons of geometric dimensions.
- ПубликацияТолько метаданныеAccuracy of the interferometric method for Leeb hardness testers calibration(2021) Kazieva, T. V.; Gubskiy, K. L.; Tischenko, I. Yu.; Glukhov, R. D.; Kuznetsov, A. P.; Казиева, Татьяна Вадимовна; Губский, Константин Леонидович; Тищенко, Илья Юрьевич; Кузнецов, Андрей Петрович© 2021 Author(s).In this article, we propose a method for improving accuracy in calibrating Leeb hardness testers using fiber interferometric systems. The calibration system is implemented using the photonic Doppler velocimetry technique. This paper provides estimates of the measurement uncertainty arising in the calibration system and describes a method for improving accuracy, which takes into account the signal-to-noise ratio, sampling rate, and processing parameters.
- ПубликацияТолько метаданныеImpactor velocity measurement system for dynamic hardness testers and calibration machines on Leeb scales(2021) Gogolinskii, K.; Syasko, V.; Umanskii, A.; Kazieva, T.; Gubskiy, K.; Kuznetsov, A.; Gluhov, R.; Казиева, Татьяна Вадимовна; Губский, Константин Леонидович; Кузнецов, Андрей Петрович© 2020 Elsevier LtdThe article aims to solve the problem of measuring the impactor velocity for dynamic hardness testers according to the Leeb, as one of the key parameters to ensure the accuracy and reliability of hardness measurements by this method. The gravitational method of impactor acceleration, used in calibration machines, and spring acceleration, typical for hardness testers, have been studied. Various technical solutions for velocity calibration are analyzed. Accurate, easy to implement, compact and inexpensive device based on fiber optic and allows monitoring the dynamics of the object without the use of additional reflective elements is developed. This system suitable for calibration or verification of dynamic hardness testers and calibration machines. The system is based on a laser interferometer in which the direct optical heterodyning of Doppler signals (Photonic Doppler Velocimetry) is applied. The maximum permissible error of the system is determined by the requirements for the metrological characteristics of the Leeb hardness calibration machine and is 0.0025 m/s at a speed of ~2 m/s. The possibility to measure the impact body velocity with an error of 0.2·10-3 m/s is confirmed.
- ПубликацияТолько метаданныеInferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments(2021) Burdonov, K.; Bonito, R.; Giannini, T.; Aidakina, N.; Gubskiy, K.; Kuznetsov, A.; Pikuz, S.; Ryazantsev, S.; Губский, Константин Леонидович; Кузнецов, Андрей Петрович© K. Burdonov et al. 2021.Aims. EXor-type objects are protostars that display powerful UV-optical outbursts caused by intermittent and powerful events of magnetospheric accretion. These objects are not yet well investigated and are quite difficult to characterize. Several parameters, such as plasma stream velocities, characteristic densities, and temperatures, can be retrieved from present observations. As of yet, however, there is no information about the magnetic field values and the exact underlying accretion scenario is also under discussion. Methods. We use laboratory plasmas, created by a high power laser impacting a solid target or by a plasma gun injector, and make these plasmas propagate perpendicularly to a strong external magnetic field. The propagating plasmas are found to be well scaled to the presently inferred parameters of EXor-type accretion event, thus allowing us to study the behaviour of such episodic accretion processes in scaled conditions. Results. We propose a scenario of additional matter accretion in the equatorial plane, which claims to explain the increased accretion rates of the EXor objects, supported by the experimental demonstration of effective plasma propagation across the magnetic field. In particular, our laboratory investigation allows us to determine that the field strength in the accretion stream of EXor objects, in a position intermediate between the truncation radius and the stellar surface, should be of the order of 100 G. This, in turn, suggests a field strength of a few kilogausses on the stellar surface, which is similar to values inferred from observations of classical T Tauri stars.
- ПубликацияТолько метаданныеUse of Direct Optical Heterodyning for Measuring Hardness by the Leeb Method(2019) Kazieva, T. V.; Gubskii, K. L.; Kuznetsov, A. P.; Glukhov, R. D.; Казиева, Татьяна Вадимовна; Губский, Константин Леонидович; Кузнецов, Андрей Петрович© 2019, Pleiades Publishing, Ltd.Abstract: In this paper, we describe a portable system for measuring the indenter velocity in hardness meters implemented according to the Leeb method. The developed system is a fiber interferometer, in which a radiation source is a semiconductor laser with a wavelength of 1550 nm. The presented experimental results confirm the ability of the system to measure indenter velocities with an uncertainty of 0.001 m/s, which satisfies the requirements of the standards for this method of measuring hardness.
- ПубликацияТолько метаданныеNeural network analysis of quasistationary magnetic fields in microcoils driven by short laser pulses(2022) Kochetkov, I. V.; Bukharskii, N. D.; Ehret, M.; Kuznetsov, A.; Korneev, P.; Кочетков, Юрий Владимирович; Бухарский, Николай Дмитриевич; Кузнецов, Андрей Петрович; Корнеев, Филипп АлександровичOptical generation of kilo-tesla scale magnetic fields enables prospective technologies and fundamental studies with unprecedentedly high magnetic field energy density. A question is the optimal configuration of proposed setups, where plenty of physical phenomena accompany the generation and complicate both theoretical studies and experimental realizations. Short laser drivers seem more suitable in many applications, though the process is tangled by an intrinsic transient nature. In this work, an artificial neural network is engaged for unravelling main features of the magnetic field excited with a picosecond laser pulse. The trained neural network acquires an ability to read the magnetic field values from experimental data, extremely facilitating interpretation of the experimental results. The conclusion is that the short sub-picosecond laser pulse may generate a quasi-stationary magnetic field structure living on a hundred picosecond time scale, when the induced current forms a closed circuit. © 2022, The Author(s).
- ПубликацияОткрытый доступЛазерная интерферометрия в диагностике импульсной плазмы(НИЯУ МИФИ, 2012) Кузнецов, А. П.; Кузнецов, Андрей Петрович
- ПубликацияТолько метаданныеStopping Power Measurement for 100 keV/u Fe Ions in Hydrogen Plasma(2021) Gavrilin, R. O.; Khurchiev, A. O.; Kantsyrev, A. V.; Basko, M. M.; Kuznetsov, A. P.; Кузнецов, Андрей Петрович© 2021, Pleiades Publishing, Ltd.Abstract: The interaction of a heavy-ion beam with matter is a fundamental problem of plasma physics and high-energy density in matter physics. The paper presents the results of experimental studies of energy losses of Fe+2 ions with an energy of 100 keV/u in a hydrogen plasma. The experimental data of plasma free electron stopping power are compared with theoretical models.