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Публикации КЛ ПВЭ

Early Results from TUS, the First Orbital Detector of Extreme Energy Cosmic Rays

TUS is the world's first orbital detector of extreme energy cosmic rays (EECRs), which operates as a part of the scientific payload of the Lomonosov satellite since May 19, 2016. TUS employs the nocturnal atmosphere of the Earth to register ultraviolet (UV) fluorescence and Cherenkov radiation from extensive air showers generated by EECRs as well as UV radiation from lightning strikes and transient luminous events, micro-meteors and space debris. The first months of its operation in orbit have demonstrated an unexpectedly rich variety of UV radiation in the atmosphere. We briefly review the design of TUS and present a few examples of events recorded in a mode dedicated to registering EECRs.

04.04.2017 Mikhail Zotov, for the Lomonosov-UHECR/TLE Collaboration Arxiv.org (Submitted on 28 Mar 2017 (v1), last revised 2 Apr 2017 (this version, v2))

First results of the Lomonosov TUS and GRB experiments

On April 28, 2016, the Lomonosov satellite, equipped with a number of scientific instruments, was launched into orbit. Here we present briefly some of the results obtained with the first orbital telescope of extreme energy cosmic rays TUS and by a group of detectors aimed at multi-messenger observations of gamma-ray bursts.


04.04.2017 S.V. Biktemerova, A.V. Bogomolov, V.V. Bogomolov, A.A. Botvinko, A.J. Castro-Tirado, E.S. Gorbovskoy, N.P. Chirskaya, V.E. Eremeev, G.K. Garipov, V.M. Grebenyuk, A.A. Grinyuk, A.F. Iyudin, S. Jeong, H.M. Jeong, N.L. Jioeva, P.S. Kazarjan, N.N. Kalmykov, M.A. Kaznacheeva, B.A. Khrenov, M.B. Kim, P.A. Klimov, E.A. Kuznetsova, M.V. Lavrova, J. Lee, V.M. Lipunov, O. Martinez, I.N. Mjagkova, M.I. Panasyuk, I.H. Park, V.L. Petrov, E. Ponce, A.E. Puchkov, H. Salazar, O.A. Saprykin, A.N. Senkovsky, S.A. Sharakin, A.V. Shirokov, S.I. Svertilov, A.V. Tkachenko, L.G. Tkachev, I.V. Yashin, M.Yu. Zotov Arxiv.org (Submitted on 10 Mar 2017 (v1), last revised 26 Mar 2017 (this version, v2))

Предварительные результаты орбитального детектора космических лучей предельно высоких энергий “ТУС”: регистрация эффекта прохождения частиц низких энергий через фотоприемник.

Телескоп “ТУС”, входящий в состав научной аппаратуры Российского университетского спутника “Ломоносов”, является первым в мире орбитальным детектором космических лучей предельно высоких энергий. В работе представлены предварительные результаты анализа неожиданных мощных сигналов, зарегистрированных, начиная с первых дней работы прибора. Данные сигналы возникают одновременно в течении времени порядка 1 мкс в группах соседних ячеек фотодетектора, упорядоченных в линейные треко-подобные последовательности. Результаты компьютерного моделирования с использованием программного комплекса GEANT4, а также наблюдение широтного эффекта в распределении данных событий свидетельствуют в пользу предположения, что наблюдаемые сигналы являются результатом прохождения протонов с энергиями от сотен МэВ до нескольких ГэВ через фотоприемник детектора.

DOI: 10.7868/S0367676517040251

04.04.2017 П. А. Климов, М. Ю. Зотов, Н. П. Чирская, Б. А. Хренов, Г. К. Гарипов, М. И. Панасюк, С. А. Шаракин, А. В. Широков, И. В. Яшин, А. А. Гринюк, А. В. Ткаченко, Л. Г. Ткачев Известия РАН, серия физическая, 81(4):442–445, 2017.

The orbital TUS detector simulation

The TUS space experiment is aimed at studying energy and arrival distribution of UHECR at E>7 × 1019 eV by using the data of EAS fluorescent radiation in atmosphere. The TUS mission was launched at the end of April 2016 on board the dedicated “Lomonosov” satellite. The TUSSIM software package has been developed to simulate performance of the TUS detector for the Fresnel mirror optical parameters, the light concentrator of the photo detector, the front end and trigger electronics. Trigger efficiency crucially depends on the background level which varies in a wide range: from  0.2 × 106 to  15 × 106 ph/( m2 μs sr) at moonless and full moon nights respectively. The TUSSIM algorithms are described and the expected TUS statistics is presented for 5 years of data collection from the 500 km solar-synchronized orbit with allowance for the variability of the background light intensity during the space flight.

DOI: 10.1016/j.astropartphys.2016.09.003

04.04.2017 A. Grinyuk, V. Grebenyuk, B. Khrenov, P. Klimov, M. Lavrova, M. Panasyuk, S. Sharakin, A. Shirokov, A. Tkachenko, L. Tkachev, I. Yashin Astroparticle Physics, Volume 90, April 2017, Pages 93-97

Detection prospects of the Telescope Array hotspot by space observatories

In the present-day cosmic ray data, the strongest indication of anisotropy of the ultrahigh energy cosmic rays is the 20-degree hotspot observed by the Telescope Array with the statistical significance of 3.4σ. In this work, we study the possibility of detecting such a spot by space-based all-sky observatories. We show that if the detected luminosity of the hotspot is attributed to a physical effect and not a statistical fluctuation, the KLYPVE and JEM-EUSO experiments would need to collect 300events with E>57EeV in order to detect the hotspot at the 5σ confidence level with the 68% probability. We also study the dependence of the detection prospects on the hotspot luminosity.

DOI: http://dx.doi.org/10.1103/PhysRevD.93.103005

26.07.2016 D. Semikoz, P. Tinyakov, and M. Zotov Phys. Rev. D 93, 103005 – Published 23 May 2016

Space experiment TUS on board the Lomonosov satellite as pathfinder of JEM-EUSO

Space-based detectors for the study of extreme energy cosmic rays (EECR) are being prepared as a promising new method for detecting highest energy cosmic rays. A pioneering space device – the “tracking ultraviolet set-up” (TUS) – is in the last stage of its construction and testing. The TUS detector will collect preliminary data on EECR in the conditions of a space environment, which will be extremely useful for planning the major JEM-EUSO detector operation.

DOI: 10.1007/s10686-015-9465-y

26.11.2015 The JEM-EUSO Collaboration Experimental Astronomy, November 2015, Volume 40, Issue 1, pp 315-326

Ultra high energy cosmic ray detector KLYPVE on board the Russian Segment of the ISS

Modified KLYPVE is a novel fluorescence detector of ultra high energy cosmic rays (UHECRs, energies ≥50EeV) to be installed on the Russian Segment of the International Space Station. The main goal of the experiment is to register arrival directions and energies of UHECRs but it will be able to register other transient events in the atmosphere as well. The main component of KLYPVE is a segmented two component optical system with a large entrance pupil and a wide field of view, which provides annual exposure approximately twice that of the Pierre Auger Observatory. The project is actively developed by a working group of the JEM-EUSO Collaboration led by Skobeltsyn Institute of Nuclear Physics at Moscow State University (Russia). The current status ofKLYPVE with a focus on its scientific tasks, technical parameters and instruments is presented.

11.10.2015 M. I. Panasyuk, P. Picozza, M. Casolino, T. Ebisuzaki, P. Gorodetzky, B. A. Khrenov, P. A. Klimov, S. A. Sharakin and M. Yu. Zotov Proc. ICRC-2015 PoS(ICRC2015)669

Детектор космических лучей предельно высоких энергий КЛПВЭ на борту МКС

В работе представлено современное состояние проекта орбитального детектора космических лучей предельно высоких энергий "КЛПВЭ", установка которого будет осуществлена на борту Российского сегмента МКС. Основное внимание уделено описанию возможных оптических систем данного прибора.

11.10.2015 Г.К. Гарипов, М.Ю. Зотов, П.А. Климов, М.И. Панасюк, О.А. Сапрыкин, Л.Г. Ткачев, С.А. Шаракин, Б.А. Хренов, И.В. Яшин Известия РАН, серия физическая, 79(3):358–361, 2015

The current status of orbital experiments for UHECR studies

Two types of orbital detectors of extreme energy cosmic rays are being developed nowadays: (i) TUS and KLYPVE with reflecting optical systems (mirrors) and (ii) JEM-EUSO with high- transmittance Fresnel lenses. They will cover much larger areas than existing ground-based arrays and almost uniformly monitor the celestial sphere. The TUS detector is the pioneering mission developed in SINP MSU in cooperation with several Russian and foreign institutions. It has relatively small field of view (±4.5°), which corresponds to a ground area of 6.4•103 km2 . The telescope consists of a Fresnel-type mirror-concentrator ( 2 m2 ) and a photo receiver (a matrix of 16 x 16 photomultiplier tubes). It is to be deployed on the Lomonosov satellite, and is currently at the final stage of preflight tests. Recently, SINP MSU began the KLYPVE project to be installed on board of the Russian segment of the ISS. The optical system of this detector contains a larger primary mirror (10 m 2 ), which allows decreasing the energy threshold. The total effective field of view will be at least ±14° to exceed the annual exposure of the existing ground-based experiments. Several configurations of the detector are being currently considered. Finally, JEM-EUSO is a wide field of view (±30°) detector. The optics is composed of two curved double-sided Fresnel lenses with 2.65 m external diameter, a precision diffractive middle lens and a pupil. The ultraviolet photons are focused onto the focal surface, which consists of nearly 5000 multi-anode photomultipliers. It is developed by a large international collaboration. All three orbital detectors have multi-purpose character due to continuous monitoring of various atmospheric phenomena. The present status of development of the TUS and KLYPVE missions is reported, and a brief comparison of the projects with JEM-EUSO is given. [http://iopscience.iop.org/article]

11.10.2015 M.I. Panasyuk, M. Casolino, G.K. Garipov, T. Ebisuzaki, P. Gorodetzky, B.A. Khrenov, P.A. Klimov, V.S. Morozenko, N. Sakaki, O.A. Saprykin, S.A. Sharakin, Y. Takizawa, L.G. Tkachev, I.V. Yashin, and M.Yu Zotov Journal of Physics, 632(1):012097, 2015.

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