Персона: Васильев, Александр Николаевич
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Институт нанотехнологий в электронике, спинтронике и фотонике
Институт ИНТЭЛ занимается научной деятельностью и подготовкой специалистов в области исследования физических принципов, проектирования и разработки технологий создания компонентной базы электроники гражданского и специального назначения, а также построения современных приборов на её основе.
Наша основная цель – это создание и развитие научно-образовательного центра мирового уровня в области наноструктурных материалов и устройств электроники, спинтроники, фотоники, а также создание эффективной инновационной среды в области СВЧ-электронной и радиационно-стойкой компонентной базы, источников ТГц излучения, ионно-кластерных технологий материалов.
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- ПубликацияОткрытый доступResearch projects of the Mega-science class in Nuclear University(2019) Moshkova, D. M.; Vasiliev, A. N.; Astapov, I. I.; Barbashina, N. S.; Lozovskij, D. L.; Васильев, Александр Николаевич; Астапов, Иван Иванович; Барбашина, Наталья Сергеевна; Лозовский, Дмитрий Львович© Published under licence by IOP Publishing Ltd.Fundamental research in the field of high energy physics and nuclear physics is carried out at large international experiments with the joint participation of scientific organizations and research universities. This article discusses the features of the participation of a nuclear university in international research projects of the Mega-science class by the example of the National Research Nuclear University MEPhI. MEPhI is actively involved in the development, operation, and modernization of research projects of the Mega-science class, such as LHC, FAIR, NICA, RHIC, ITER, NEVOD. Participation in these megaprojects gives MEPhI an opportunity to gain unique new knowledge for the development of nuclear technologies and nuclear energy, to increase prestige and to gain access to modern high technologies. These issues were discussed at a conference "Personnel training and legal support for the implementation of scientific projects of the Mega-science class" organized by National Research Nuclear University MEPhI and Kutafin Moscow State Law University on June 20-21, 2019. The aim of the Conference is to discuss the policy management issues of implementation of the Mega-science class research projects.
- ПубликацияОткрытый доступВывод пучка протонов варьируемой интенсивности из ускорителя У-70 с помощью изогнутых кристаллов(2025) Решетников, С. Ф.; Афонин, А. Г.; Барнов, Е. В.; Васильев, А. Н.; Маишеев, В. А.; Мочалов, В. В.; Семенов, П. А.; Чесноков, Ю. А; Мочалов, Василий Вадимович; Семенов, Павел Александрович; Васильев, Александр НиколаевичПредставлены результаты работ по управлению интенсивности пучка протонов, выводимого из ускорителя У-70 с помощью изогнутых монокристаллов кремния. Продемонстрирована устойчивая работа вывода пучка, с помощью кристаллов, для двух экспериментов, где требовалась плавная регулировка интенсивности пучка в большом динамическом диапазоне.
- ПубликацияОткрытый доступМагниты эксперимента СПАСЧАРМ на ускорительном комплексе У-70(2023) Мещанин, А. П.; Васильев, А. Н.; Гончаренко, Ю. М.; Кормилицын, В. А.; Минаев, Н. Г.; Мочалов, В. В.; Рыков, В. Л.; Рябов, А. Д.; Рябова, Т. Д.; Рязанцев, А. В.; Семенов, П. А.; Сёмин, С. А.; Симонова, З. Г.; Рыков, Владимир Львович; Мочалов, Василий Вадимович; Васильев, Александр Николаевич; Семенов, Павел АлександровичОписана система из четырех магнитов, являющаяся частью экспериментальной установки СПА-СЧАРМ на ускорительном комплексе У-70 для исследования спиновых эффектов в адронных взаимодействиях. Уникальный магнит с полем 2.4 Тл и однородностью поля на уровне 10–4 в рабочем объеме 60 см3 служит для накачки и удержания поляризации в поляризованной протон-ной замороженной мишени. Специальный широкоапертурный магнит является центральной ча-стью спектрометра установки на основе дрейфовых трубок. Для прецизионного наведения пучка на центр мишени были изготовлены и введены в состав установки два небольших корректирующих магнита разработки НИИЭФА им. Д.В. Ефремова.
- ПубликацияОткрытый доступProposal of the complete experiment for elastic pp and p(bar)p scattering at SPASCHARM program at U70 accelerator(2019) Chetvertkova, V. A.; Kalugin, N. K.; Ladygin, V. P.; Bogdanov, A. A.; Mochalov, V. V.; Nurusheva, M. B.; Okorokov, V. A.; Semenov, P. A.; Vasiliev, A. N.; Zherebtsova, L. S.; Богданов, Алексей Александрович; Мочалов, Василий Вадимович; Нурушева, Марина Борисовна; Окороков, Виталий Алексеевич; Семенов, Павел Александрович; Васильев, Александр Николаевич© Published under licence by IOP Publishing Ltd.Newly developing SPASCHARM (SPin Asymmetry in CHARMonia) experiment at U70 accelerator will give the unique possibility to measure spin effects with the use of polarized proton and antiproton beams and polarized target. We suggest to carry out the measurements of the pp and p(bar)p elastic scattering spin observables at 16 GeV/c (direct reconstruction of elastic pp and p(bar)p elastic scattering amplitudes at SPASCHARM experiment). To date the direct reconstruction of amplitudes for pp elastic scattering was performed up to 6 GeV/c only, meanwhile there is no available data for p(bar)p elastics scattering. New measurements at SPASCHARM will significantly extend the energy range of the spin studies and will give unique possibility to compare elastic pp and p(bar5)p scattering.
- ПубликацияОткрытый доступMegascience projects in modern nuclear physics and personnel training(2020) Moshkova, D. M.; Barbashina, N. S.; Astapov, I. I.; Delov, M. I.; Vasiliev, A. N.; Барбашина, Наталья Сергеевна; Астапов, Иван Иванович; Делов, Максим Игоревич; Васильев, Александр Николаевич© Published under licence by IOP Publishing Ltd.Modern nuclear physics is impossible without the implementation of projects of the megascience class, for the creation of which the efforts of many organizations and countries are consolidated. The level and complexity of experiments carried out with the use of such facilities is provided by scientific researchers with a wide range of competencies. The education of such researchers is an important task for scientific and educational organizations. These issues were discussed at the 2nd conference "Personnel training and legal support for the implementation of scientific projects of the Mega-science class"organized by National Research Nuclear University MEPhI and Kutafin Moscow State Law University on June 25, 2020. The aim of the Conference was to discuss the policy management issues of implementation of the Mega-science class research projects.
- ПубликацияОткрытый доступAnalytical reconstruction of pp elastic scattering amplitudes from the complete sets of experiments at the SPASCHARM facility at U70(2020) Chetvertkova, V. A.; Kozelov, A. V.; Ladygin, V. P.; Bogdanov, A. A.; Mochalov, V. V.; Nurusheva, M. B.; Okorokov, V. A.; Oreshkov, A. O.; Rykov, V. L.; Semenov, P. A.; Vasiliev, A. N.; Богданов, Алексей Александрович; Мочалов, Василий Вадимович; Нурушева, Марина Борисовна; Окороков, Виталий Алексеевич; Рыков, Владимир Львович; Семенов, Павел Александрович; Васильев, Александр Николаевич© Published under licence by IOP Publishing Ltd.The direct reconstruction of the pp elastic scattering amplitudes at the energy of 16 GeV is discussed. At the SPASCHARM experiment, the 19 different spin dependent observables will be measured in pp elastic scattering. The suggested selection of observables allows a complete analytical reconstruction of elastic scattering amplitudes as a solution of the system of bilinear equations. A set of physical observables, which are necessary for model independent reconstruction of all five complex elastic pp scattering amplitudes, is defined.
- ПубликацияОткрытый доступDefinition of the NV-center orientations relative to the diamond crystal plane(2020) Kukin, N. S.; Kargin, N. I.; Korchevaya, I. O.; Muradova, A. R.; Semenov, P. A.; Vasiliev, A. N.; Каргин, Николай Иванович; Семенов, Павел Александрович; Васильев, Александр Николаевич© Published under licence by IOP Publishing Ltd.We investigate the electron spin resonance of an ensemble of Nitrogen-Vacancy color centers in a bulk diamond crystal obtained by CVD-method. The diamond crystal had 1 ppm concentration of nitrogen. The four possible orientations of the NV-center in the crystal lattice lead to different dependences of a magnitude and an orientation of the external static magnetic field. We used the field of 35 Gauss with the vector in the plane of the crystal. We could rotate it to a certain angle within almost 360 degrees around the normal vector to the plane of the crystal. The goal was to define the unknown orientations of the four axes of the NV-centers relatively to the crystal plane. Experimental results obtained at room temperature with a continuous microwave excitation and presented in this paper are in a good agreement with our simulations.
- ПубликацияОткрытый доступMeasurement of single-spin asymmetry for charged pions in the SPASCHARM experiment at U70 accelerator(2020) Abramov, V. V.; Kalugin, N. K.; Moiseev, V. V.; Morozov, D. A.; Mochalov, V. V.; Nurusheva, M. B.; Oreshkov, A. O.; Rykov, V. L.; Semenov, P. A.; Vasiliev, A. N.; Мочалов, Василий Вадимович; Нурушева, Марина Борисовна; Рыков, Владимир Львович; Семенов, Павел Александрович; Васильев, Александр Николаевич© Published under licence by IOP Publishing Ltd.The SPASCHARM experiment at U70 aims an exploration of a fundamental problem in modern particle physics, the role of spin in strong interactions. At present, the first physics data have been accumulated at a negative 28 GeV beam, interacting with a frozen polarized proton target. The SPASCHARM wide-Aperture spectrometer can detect both charged and neutral particles in the large solid angle with 2π azimuthal coverage in the fragmentation region of beam-particles. It covers the kinematic region of non-perturbative quantum chromodynamics (QCD), where the theoretical predictions are difficult and unreliable due to the full strength quark confinement at low and medium momentum transfers. In this report, the current status of the experiment is presented. The algorithm for reconstructing charged tracks is discussed along with its results on real data and the comparison with the Monte Carlo (MC) simulations. Based on a real track reconstruction, the statistical errors for the measurements of single-spin asymmetries in inclusive charged pion production are estimated. The data analysis is in progress.
- ПубликацияОткрытый доступDirect reconstruction of the pp-elastic scattering amplitudes at U70(2020) Chetvertkova, V. A.; Kozelov, A. V.; Ladygin, V. P.; Bogdanov, A. A.; Mochalov, V. V.; Nurusheva, M. B.; Okorokov, V. A.; Runtso, M. F.; Vasiliev, A. N.; Богданов, Алексей Александрович; Мочалов, Василий Вадимович; Нурушева, Марина Борисовна; Окороков, Виталий Алексеевич; Васильев, Александр Николаевич© 2020 Published under licence by IOP Publishing Ltd.The direct reconstruction of pp elastic scattering amplitudes at the SPASCHARM experiment is discussed. The observables are expressed in terms of invariant amplitudes. These amplitudes are deduced analytically by solving bilinear relations. Monte-Carlo simulations of elastic scattering as well background reactions were carried out. Elastic and diffraction interactions of protons were simulated by using PYTHIA generator for 16 GeV incident protons, designed Setup geometry and the resolution of the detectors. The criteria to select elastic processes are discussed and presented. Two-dimensional distributions of the product of the tangents of the polar angles of the recoil particle and the scattered particle versus difference of the azimuth angles of these particles, were obtained. The estimated ratio of the signal to background S/(S+B) is about 0.99.
- ПубликацияОткрытый доступFeasibility studies for the measurement of single-spin asymmetry in inclusive K0sproduction at pion beam at U-70(2020) Kalugin, N. K.; Moiseev, V. V.; Morozov, D. A.; Mochalov, V. V.; Nurusheva, M. B.; Rykov, V. L.; Semenov, P. A.; Vasiliev, A. N.; Мочалов, Василий Вадимович; Нурушева, Марина Борисовна; Рыков, Владимир Львович; Семенов, Павел Александрович; Васильев, Александр Николаевич© Published under licence by IOP Publishing Ltd.In the Spring 2018, the first physics data was accumulated in the new SPASCHARM experiment at U-70 accelerator of IHEP, Protvino. The first stage of SPASCHARM's physics programs prursues the goal of studying spin effects in the beam fragmentation region at an unpolarized negative 28 GeV beam, interacting with a frozen polarized proton target. In this resport, the feasibility of measuring the single spin asymmetry AN in the reaction: π - + p↑→K 0 S + X is evaluated by Monte-Carlo simulations. We present estimates of the detection efficiency as well as for expected event statistics. It is shown that, in the process of interest above, the attainable statistical errors for AN would be at the scale of a few percents.