Персона: Савченко, Александр Алексеевич
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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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Савченко
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Александр Алексеевич
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Теперь показываю 1 - 10 из 19
- ПубликацияТолько метаданныеSimulation of positron spectra of a hybrid positron source(2020) Wagner, W.; Savchenko, A. A.; Azadegan, B.; Вагнер, Вольфганг Зигфрид; Савченко, Александр АлексеевичAs known, the dipole approximation of channeling radiation (CR) successively overestimates the radiation yield, when the electron-beam energy approaches and exceeds 1 GeV. Consequently, we applied the nondipole approximation to simulate positron production via conversion of CR into e(+)e(-)-pairs in the scheme of a so-called hybrid positron source. GEANT4 simulations of positron spectra obtained from an amorphous tungsten converter at irradiation by <100> axial CR generated in tungsten and diamond single crystals are presented. For comparison, we calculated the CR spectra in dipole and nondipole approximation.
- ПубликацияТолько метаданныеNondipolarity of axial channeling radiation at GeV beam energies(2019) Azadegan, B.; Shafiee, M.; Wagner, W.; Savchenko, A. A.; Вагнер, Вольфганг Зигфрид; Савченко, Александр АлексеевичWe consider the nondipolarity of axial channeling radiation generated in a tungsten single crystal at electron-beam energies of several GeV. The calculations are based on the realistic axial continuous potential. It could be shown that, compared to the dipole approximation, the nondipole approximation results in a considerable variation of the channeling radiation spectrum. In a simulation of positron production via conversion of gamma radiation into e(+)e(-) pairs, the observed effect may play an important role.
- ПубликацияТолько метаданныеNew module for channeling radiation simulation in Geant4(2021) Savchenko, A. A.; Wagner, W.; Савченко, Александр Алексеевич; Вагнер, Вольфганг Зигфрид© 2021 IOP Publishing Ltd and Sissa MedialabWe present a new C++ module for simulation of channeling radiation to be implemented in Geant4 as a discrete physical process. The module allows simulation of channeling radiation from relativistic electrons and positrons with energies above 100 MeV for various types of single crystals. In this paper, we simulate planar channeling radiation applying the classical approach in the dipole approximation as a first attempt not yet considering other contributory processes. Simulation results are proved to be in a rather good agreement with experimental data.
- ПубликацияТолько метаданныеGEANT4 FOR INVERSE COMPTON RADIATION SOURCE SIMULATIONS(2021) Savchenko, A. A.; Tishchenko, A. A.; Sergeeva, D. Yu.; Савченко, Александр Алексеевич; Тищенко, Алексей Александрович; Сергеева, Дарья Юрьевна© 27th Russian Particle Accelerator Conference, RuPAC 2021. All rights reserved.In this paper, creation and implementation of the Compton backscattering module into the Geant4 package are under consideration. Created module of Compton backscattering has been implemented as a discrete physical process and operates with a fixed light target (a virtual volume with the properties of a laser beam), with which a beam of charged particles interacts producing x-rays. Such a description allows user to flexibly change necessary parameters depending on the problem being solved, which opens up new possibilities for using Geant4 in the studied area.
- ПубликацияТолько метаданныеSearch for a new material for a medical Cherenkov radiation detector(2024) Savchenko, A. A.; Tishchenko, A. A.; Савченко, Александр Алексеевич; Тищенко, Алексей Александрович
- ПубликацияОткрытый доступПереходное излучение ультрарелятивистских заряженных частиц в периодических структурах(НИЯУ МИФИ, 2020) Савченко, А. А.; Савченко, Александр Алексеевич; Стриханов, М. Н.
- ПубликацияТолько метаданныеSimulation of channeling radiation and positron production in thick diamond structures and a tungsten single crystal(2019) Azadegan, B.; Wagner, W.; Savchenko, A. A.; Tishchenko, A. A.; Вагнер, Вольфганг Зигфрид; Савченко, Александр Алексеевич; Тищенко, Алексей Александрович© 2019 The process of de-channeling for electrons of energy 2 GeV channeled in the (110) plane of silicon and tungsten single crystals has been studied. The dynamics of the particle distribution density has been investigated in dependence on both the energy and scattering distribution of the initial electron beam. The influence of de-channeling on the spectral intensity of channeling radiation has been investigated by solving the Fokker-Planck equation. A non-conventional positron source is described based on the generation of radiation by relativistic electrons channeled along different crystallographic planes or axes of W, Si, Ge and C (diamond) single crystals and the subsequent conversion of the radiation into e+e−-pairs in an amorphous tungsten target. The simulation of channeling radiation and its dependence on the incidence angle into the crystal has been carried out by means of our Mathematica codes. The conversion of the radiation into e+e−-pairs and the energy distribution of positrons have been simulated using the GEANT4 package.
- ПубликацияОткрытый доступDevelopment of Transition Radiation Detectors for hadron identification at TeV energy scale(2019) Cherry, M. L.; Dachs, F.; Fusco, P.; Gargano, F.; Belyaev, N.; Doronin, S. A.; Filippov, K.; Ponomarenko, D.; Pyatiizbyantseva, D.; Romaniouk, A.; Savchenko, A. A.; Sergeeva, D. Y.; Shulga, E.; Smirnov, S.; Smirnov, Y.; Strikhanov, M.; Teterin, P.; Tikhomirov, V.; Tishchenko, A. A.; Vorobev, K.; Доронин, Семен Александрович; Пятиизбянцева, Диана Николаевна; Романюк, Анатолий Самсонович; Савченко, Александр Алексеевич; Сергеева, Дарья Юрьевна; Смирнов, Сергей Юрьевич; Смирнов, Юрий Сергеевич; Стриханов, Михаил Николаевич; Тетерин, Пётр Евгеньевич; Тихомиров, Владимир Олегович; Тищенко, Алексей Александрович; Воробьёв, Константин Александрович© Published under licence by IOP Publishing Ltd.Many modern and future accelerator and cosmic ray experiments require identification of particles with Lorentz γ-factor up to 104 and above. The only technique which reaches this range of Lorentz factors is based on the transition radiation detectors (TRD). This paper describes the development of a TRD based on straw proportional tubes. A prototype of such kind of detector was built and tested at the CERN SPS accelerator. Monte Carlo simulation model of the detector which matches well the experimental data was developed. This program was used for the simulation of a full-scale TRD for hadron identification at TeV energy scale.
- ПубликацияТолько метаданныеGeant4 application for efficiency simulation of PbF2 based calorimeters(2023) Savchenko, A. A.; Tishchenko, A. A.; Савченко, Александр Алексеевич; Тищенко, Алексей Александрович
- ПубликацияТолько метаданныеSmall-angle x-ray transition radiation from multilayered structures(2019) Savchenko, A. A.; Sergeeva, D. Yu.; Tishchenko, A. A.; Strikhanov, M. N.; Савченко, Александр Алексеевич; Сергеева, Дарья Юрьевна; Тищенко, Алексей Александрович; Стриханов, Михаил НиколаевичIn this work, we construct for the first time the theory of small-angle transition radiation from multilayered structures. The theoretically obtained spectral and angular distributions of radiated photons are compared with those predicted by GEANT4, a very popular package used today for numerical simulation of different physical processes. We demonstrate that, while spectral distributions ideally coincide, the angular ones differ. We argue that transition radiation from the multilayered structure must contain sharp spikes having the interference nature and caused by the effect of merging two maximum frequencies in dispersive media, and thus GEANT4 needs improving in this respect. The transition radiation theory developed here for the small-angle case can play a vital part for the possible future Small Angle Spectrometer at the LHC, other experiments of this kind, and detectors for hadrons of the tera-electron-volt energy range.