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Publications UHECR

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))

Preliminary results from the TUS ultra-high energy cosmic ray orbital telescope: Registration of low-energy particles passing through the photodetector

The TUS telescope, part of the scientific equipment on board the Lomonosov satellite, is the world’s first orbital detector of ultra-high energy cosmic rays. Preliminary results from analyzing unexpected powerful signals that have been detected from the first days of the telescope’s operation are presented. These signals appear simultaneously in time intervals of around 1 μs in groups of adjacent pixels of the photodetector and form linear track-like sequences. The results from computer simulations using the GEANT4 software and the observed strong latitudinal dependence of the distribution of the events favor the hypothesis that the observed signals result from protons with energies of several hundred MeV to several GeV passing through the photodetector of the TUS telescope.

DOI: 10.3103/S1062873817040256

04.04.2017 P. A. Klimov, M. Yu Zotov, N. P. Chirskaya, B. A. Khrenov, G. K. Garipov, M. I. Panasyuk, S. A. Sharakin, A. V. Shirokov, I. V. Yashin, A. A. Grinyuk, A. V. Tkachenko, L. G. Tkachev

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

The KLYPVE ultrahigh energy cosmic ray detector on board the ISS.

The current status of the KLYPVE orbital detector of ultrahigh energy cosmic rays, which is scheduled to be deployed on board the Russian module of the International Space Station, is discussed. The main focus is on describing possible optical systems for the instrument.

11.10.2015 G.K. Garipov, M.Yu Zotov, P.A. Klimov, M.I. Panasyuk, O.A. Saprykin, L.G. Tkachev, S.A. Sharakin, B.A. Khrenov, and I.V. Yashin Bulletin of the Russian Academy of Science, Physics, 79(3):326–328, 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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