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Стифуткин, Алексей Анатольевич

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Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

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Стифуткин

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Алексей Анатольевич

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Теперь показываю 1 - 9 из 9

Только метаданные
Study of silicon photomultipliers (SiPM) with organic scintillator for neutron diagnostics of thermonuclear plasma
(2022) Boukerdja, L.; Dendene, O.; Afanasiev, V. V.; Lushin, S. V.; Chergui, A. C.; Stifutkin, A. A.; Афанасьев, Валерий Викторович; Стифуткин, Алексей Анатольевич
© 2022 Elsevier B.V.The spectrometry of neutrons produced by fusion reactions of plasmatic ions is the most powerful neutron diagnostic tool for monitoring reactor operating power, temperature and concentration of ions. Currently, new generations of silicon photomultipliers (SiPMs) are being used in several light detection fields, including nuclear domain; they have performances similar to conventional photomultipliers tubes (PMTs), while benefiting advantages of solid-state technology such as insensitivity to magnetic and electric fields, excellent temperature stability, robustness, low operating voltage, small size, and low cost. Consequently, they could be a useful device in neutron spectrometer based on recoil proton method for neutron diagnostics of hot plasmas. In this paper, we have demonstrated SiPMs capabilities to be used for fast neutron detection as well as their dynamic range for thermonuclear fusion neutron spectrometry (14 Mev). The responses of SiPMs having different sizes of active areas and microcells manufactured by Ketek and SensL have been studied. Excellent pulse shape discrimination of PuBe source radiations by SiPMs combined with a stilbene crystal has been proven; the figure of merit has reached 3.33. The study has also allowed the determination of the size parameters of SiPMs that are suitable for neutron diagnostics of thermonuclear plasmas.
Только метаданные
Radiation hardness study using SiPMs with single-cell readout
(2022) Garutti, E.; Kaminsky, A.; Martens, S.; Schwandt, J.; Bychkova, O.; Parygin, P.; Popova, E.; Stifutkin, A.; Стифуткин, Алексей Анатольевич
© 2022 The Author(s)A dedicated single-cell SiPM structure is designed and measured to investigate the radiation damage effects on the gain and turn-off voltage of SiPMs exposed to a reactor neutron fluence up to Φ = 5e13 cm−2. The cell has a pitch of 15μm. The fluence dependence of gain and turn-off voltage are reported. A reduction of the gain by 19% and an increase of Voff by ≈0.5 V is observed after Φ = 5e13 cm−2.
Только метаданные
Response to cosmic muons of scintillator-SiPM assemblies measured at different temperatures
(2026) Chadeeva, M.; Stifutkin, A.; Стифуткин, Алексей Анатольевич
Только метаданные
Temperature Dependence of Response to Muons for Plastic Scintillator Tiles Wrapped in Reflective Film
(2025) Chadeeva, M. V.; Rusinov, V. Yu.; Stifutkin, A. A.; Стифуткин, Алексей Анатольевич
Только метаданные
Neutron-gamma separation study for ZnS(Ag)/6LiF scintillator and silicon photomultipliers
(2020) Chergui, A. C.; Popova, E. V.; Stifutkin, A. A.; Ilyin, A. L.; Bychkova, O. V.; Стифуткин, Алексей Анатольевич
© Published under licence by IOP Publishing Ltd.Registration of thermal neutrons while simultaneously suppressing or rejecting accompanying gamma-ray background is an important task for many fields. We report on two different experimental neutron-gamma separation studies, utilizing a ZnS(Ag)/6LiF scintillator and pulse height discrimination technique: one is a comparison of the responses of a ZnS(Ag)/6LiF scintillator and a 'reference' GAGG(Ce) scintillator when irradiated by gamma sources 137Cs and 241Am; and the second is testing a dual readout, where a photosensor coupled to the ZnS(Ag)/6LiF scintillator screen on each side was irradiated by neutrons (252Cf neutron source). For all measurements the silicon photomultipliers (SiPMs) PM3315-WB-A0 (3x3 mm2 sensitive area, 15 μm cell pitch) manufactured by KETEK were used as a photosensor. High-speed digital oscilloscope LeCroyWR 620zi with a sample rate of 10 GS/s was used as a data acquisition system.
Только метаданные
Radiation damage uniformity in a SiPM
(2022) Garutti, E.; Martens, S.; Kaminsky, A.; Schwandt, J.; Bychkova, O.; Popova, E.; Stifutkin, A.; Parygin, P.; Стифуткин, Алексей Анатольевич
© 2022 Elsevier B.V.A dedicated single-cell SiPM structure is designed and measured to investigate the radiation damage effects on the gain and breakdown voltage of SiPMs exposed to a reactor neutron fluence up to Φ = 5e13 cm−2. The cell has a pitch of 15μm. Results of the measurements and analysis of the IV-curves are presented. Impact of the self-heating effect was investigated. The radiation damage uniformity of 1 cell and 120 cells was checked up to Uov = 1.7 V. Fluence dependence of the breakdown voltage from the current measurements UbdIV was extracted and compared to that of the breakdown voltage from the gain measurements UbdG.
Открытый доступ
Application of the multichannel front-end chip for SiPM-based gamma detector
(2019) Chergui, A. C.; Bychkova, O. V.; Popova, E. V.; Stifutkin, A. A.; Стифуткин, Алексей Анатольевич
© Published under licence by IOP Publishing Ltd.A prototype of a multichannel application specific integrated circuit(ASIC)analog front-end chip was recently developed at the Department of Microelectronics in MEPhI for SiPM-based applications[1]. The chip designed as an analog front-end for the detectors using scintillation crystals NaI(Tl) or CsI(Tl) coupled with a SiPM photosensor.The chip can be used to build multichannel systems in such fields as nuclear science, medical imaging and homeland security.
Открытый доступ
Study of the SiPM double component recovery time
(2019) Bychkova, O. V.; Ilyin, A. L.; Kayumov, F. F.; Parygin, P. P.; Philippov, D. E.; Popova, E. V.; Stifutkin, A. A.; Vinogradov, S. L.; Стифуткин, Алексей Анатольевич; Виноградов, Сергей Леонидович
© Published under licence by IOP Publishing Ltd.The recovery time of the Hamamatsu SiPM linear assembly was measured. The assembly contains eight SiPMs of 2.8mm active area diameter; pixel size is 15xl5mkm2. The assembly is used for Phase1 upgrade in hadron calorimeter of the CMS experiment. Recovering process is found to depend on the number of the pixels fired and varied from 7 ±1 ns to 23 ± 3 ns for 50 Ohm readout impedance.
Открытый доступ
Experimental comparison of the measurement results of two different silicon photomultipliers and organic scintillator to detect fast neutrons
(2020) Chergui, A. C.; Popova, E. V.; Stifutkin, A. A.; Dendene, O.; Ilyin, A. L.; Vinogradov, S. L.; Bychkova, O. V.; Стифуткин, Алексей Анатольевич; Виноградов, Сергей Леонидович
© Published under licence by IOP Publishing Ltd.We report on the study of experimental comparison between the results of two types of silicon photomultiplier (SiPM), to discriminate the signals from fast neutrons and gamma-rays by the digital charge pulse shape discrimination (PSD) method. This uses a total to partial charge ratio analysis. The signals are digitized by a high-speed digital oscilloscope LeCroy WR 620zi with a sample rate of 10 GS/s. This oscilloscope was used to acquire data, which were later processed offline in a specially developed software package written in LABVIEW. The tested detector part consisted from a stilbene crystal (3x3x6 mm3 and 6x6x6 mm3) optically coupled to a SiPM (KETEK 3x3 mm2 and SensL 6x6 mm2 respectively) as a photodetector. Measurements with a Cf-252 source were performed and a figure of merit (FOM) for discrimination between neutron and gamma-ray was calculated for each assembly. The resulting value of FOM for the KETEK 3x3 mm2 SiPM and SensL 6x6 mm2 SiPM was 1.6±0.03 and 1.76±0.05, respectively, the SensL assembly having a slightly better discrimination factor than KETEK one. The obtained results prove a good fast neutron detection performance of the SiPMs, which makes it possible to use these types of neutron detectors in the several fields of radiation protection applications and safety of nuclear facilities.