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7 results on '"O. A. Gress"'

1. Gamma/Hadron Separation for a Ground Based IACT in Experiment TAIGA Using Machine Learning Methods

Author

Maria Vasyutina, L. Sveshnikova, I. I. Astapov, P. A. Bezyazeekov, M. Blank, E. A. Bonvech, A. N. Borodin, M. Brueckner, N. M. Budnev, A. V. Bulan, D. V. Chernov, A. Chiavassa, A. N. Dyachok, A. R. Gafarov, A. Yu. Garmash, V. M. Grebenyuk, O. A. Gress, T. I. Gress, A. A. Grinyuk, O. G. Grishin, Dieter Horns, A. L. Ivanova, N. N. Kalmykov, V. V. Kindin, S. N. Kiryuhin, R. P. Kokoulin, K. G. Kompaniets, E. E. Korosteleva, V. A. Kozhin, E. A. Kravchenko, A. P. Kryukov, L. A. Kuzmichev, A. A. Lagutin, M. V. Lavrova, Yu. Lemeshev, B. K. Lubsandorzhiev, N. B. Lubsandorzhiev, A. D. Lukanov, D. Lukyantsev, R. R. Mirgazov, R. Mirzoyan, R. D. Monkhoev, E. A. Osipova, A. L. Pakhorukov, L. A. Panasenko, A. Pan, L. V. Pankov, A. D. Panov, A. A. Petrukhin, D. A. Podgrudkov, V. A. Poleschuk, M. Popesku, E. G. Popova, A. Porelli, E. B. Postnikov, V. V. Prosin, V. S. Ptuskin, A. A. Pushnin, R. I. Raikin 𝑗, A. Razumov, E. Rjabov, G. I. Rubtsov, Y. I. Sagan, V. S. Samoliga, Andrei Sidorenkov, A. A. Silaev, A. A. Silaev jr, A. V. Skurikhin, M. Slunecka, A. V. Sokolov, Y. Suvorkin, V. A. Tabolenko, A. B. Tanaev, B. A. Tarashansky, M. Ternovoy, L. G. Tkachev, M. Tluczykont, N. Ushakov, A. Vaidyanathan, P. A. Volchugov, N. V. Volkov, D. Voronin, R. Wischnewski, I. I. Yashin, A. V. Zagorodnikov, and D. P. Zhurov

Subjects
Computer science, Hadron, Taiga, Separation (aeronautics), IACT, Random forest, Remote sensing
Published
2021
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2. TAIGA-IACT pointing control and monitoring software status

Author

Dmitriy Zhurov, O. A. Gress, D. S. Lukyantsev, I. I. Astapov, A. K. Awad, P. A. Bezyazeekov, M. Blank, E. A. Bonvech, A. N. Borodin, A. V. Bulan, M. Brueckner, N. M. Budnev, A. Chiavassa, D. V. Chernov, A. N. Dyachok, A. R. Gafarov, A. Yu. Garmash, V. M. Grebenyuk, E. Gress, T. I. Gress, O. G. Grishin, A. A. Grinyuk, Dieter Horns, N. N. Kalmykov, V. V. Kindin, S. N. Kiryuhin, R. P. Kokoulin, K. G. Kompaniets, E. E. Korosteleva, V. A. Kozhin, E. A. Kravchenko, A. P. Kryukov, L. A. Kuzmichev, A. A. Lagutin, M. Lavrova, B. K. Lubsandorzhiev, N. B. Lubsandorzhiev, A. D. Lukanov, R. R. Mirgazov, R. Mirzoyan, R. D. Monkhoev, E. A. Osipova, A. L. Pakhorukov, A. Pan, L. V. Pankov, A. D. Panov, A. A. Petrukhin, D. A. Podgrudkov, V. A. Poleschuk, M. Popesku, E. G. Popova, A. Porelli, E. B. Postnikov, V. V. Prosin, V. S. Ptuskin, A. A. Pushnin, R. I. Raikin, A. Y. Razumov, G. I. Rubtsov, E. V. Ryabov, Y. I. Sagan, V. S. Samoliga, A. A. Silaev, A. A. junior Silaev, Andrei Sidorenkov, A. V. Skurikhin, M. Slunecka, A. V. Sokolov, L. G. Sveshnikova, V. A. Tabolenko, B. A. Tarashansky, L. G. Tkachev, R. Togoo, M. Tluczykont, N. Ushakov, A. Vaidyanathan, P. A. Volchugov, N. V. Volkov, D. Voronin, R. Wischnewski, A. V. Zagorodnikov, and I. I. Yashin

Published
2021
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3. TAIGA - an advanced hybrid detector complex for astroparticle physics, cosmic ray physics and gamma-ray astronomy

Author

V. P. Sulakov, E. A. Kravchenko, Roman Raikin, A. A. Grinyuk, A. Chiavassa, E. E. Korosteleva, BayarJon Paul Lubsandorzhiev, E. Popova, R. R. Mirgazov, L. G. Sveshnikova, S. Malakhov, R. P. Kokoulin, R. Togoo, A. Petrukhin, Yu. Lemeshev, A.V. Igoshin, S. Kiryuhin, V. V. Prosin, A. Porelli, A. Borodin, M. Blank, A. Ivanova, M. Tluczykont, A. N. Dyachok, V.A. Tabolenko, L. G. Tkachev, V. Samoliga, V. A. Poleschuk, R. Wischnewski, A. Bulan, E. A. Osipova, N. Ushakov, Pavel Bezyazeekov, Evgeny Postnikov, D. Zhurov, L. V. Pankov, A. Garmash, M. Ternovoy, D. Voronin, O. A. Gress, T. I. Gress, V. V. Kindin, I. I. Astapov, V. A. Kozhin, K. G. Kompaniets, Andrey Sokolov, E. V. Ryabov, R. Mirzoyan, Grigory Rubtsov, N. N. Kalmykov, O. Grishin, M. Popesku, D. Lukyantsev, V. Slunecka, A. V. Skurikhin, Y. Sagan, Dieter Horns, V. S. Ptuskin, P. Volchugov, A. L. Pakhorukov, A. Tanaev, A. Pushnin, N. B. Lubsandorzhiev, Aleksandr Gafarov, A. A. Silaev, A. V. Zagorodnikov, N. M. Budnev, Y. Suvorkin, E. Gress, A. Zhaglova, L. A. Kuzmichev, V. M. Grebenyuk, B. A. Tarashchansky, A. Vaidyanathan, I. Poddubnyi, Anatoly Lagutin, V. Ponomareva, M. Brückner, R. D. Monkhoev, B. M. Sabirov, I. I. Yashin, Alexander Kryukov, and A. Sidorenkov

Subjects
Astroparticle physics, Physics, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Taiga, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Cosmic ray, Electron, Gamma-ray astronomy, Cherenkov radiation
Abstract

The physical motivations and performance of the TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) project are presented. The TAIGA observatory addresses ground-based gamma-ray astronomy at energies from a few TeV to several PeV, as well as cosmic ray physics from 100 TeV to several EeV and astroparticle physics. The pilot TAIGA complex locates in the Tunka valley, ~50 km West from the southern tip of the lake Baikal. It includes integrating air Cherenkov TAIGA-HiSCORE array with 120 wide-angle optical stations distributed over on area 1 square kilometer about and three the 4-m class Imaging Atmospheric Cherenkov Telescopes of the TAIGA-IACT array. The latter array has a shape of triangle with side lengths of about 300m, 400m and 500m. The expected integral sensitivity of the 1 km2 TAIGA detector will be about 2,5 × 10-13 TeV cm-2 sec-1 for detection of E ≥ 100 TeV gamma-rays in 300 hours of source observations. The combination of the wide angle Cherenkov array and IACTs could offer a cost effective-way to build a really large (up to 10 km2) array for very high energy gamma-ray astronomy. The reconstruction of a given EAS energy, incoming direction and the core position, based on the TAIGA-HiSCORE data, allows one to increase the distance between the relatively expensive IACTs up to 600-800 m. These, together with the surface and underground electron/Muon detectors will be used for selection of gamma-ray induced EAS. Present status of the project, together with the current array description and the first experimental results and plans for the future will be reported.

Published
2021
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4. Improved measurements of the energy and shower maximum of cosmic rays with Tunka-Rex

Author

R. R. Mirgazov, Oleg Fedorov, N. B. Lubsandorzhiev, A. Pakhorukov, Aleksey Zagorodnikov, Yulia Kazarina, E. A. Osipova, V. V. Lenok, T. Marshalkina, Pavel Bezyazeekov, R. Hiller, O. Krömer, L. A. Kuzmichev, N. M. Budnev, Frank Schroeder, D. Chernykh, E. E. Korosteleva, L. V. Pankov, Andreas Haungs, Matthias Kleifges, V. V. Prosin, Dmitriy Kostunin, O. A. Gress, and R. D. Monkhoev

Subjects
Physics, Antenna array, Optics, Amplitude, Physics::Instrumentation and Detectors, business.industry, Detector, Cosmic ray, LOFAR, Antenna (radio), business, Maxima, Energy (signal processing)
Abstract

The Tunka Radio Extension (Tunka-Rex) is an array of 63 antennas located in the Tunka Valley, Siberia. It detects radio pulses in the 30-80 MHz band produced during the air-shower development. As shown by Tunka-Rex, a sparse radio array with about 200 m spacing is able to reconstruct the energy and the depth of the shower maximum with satisfactory precision using simple methods based on parameters of the lateral distribution of amplitudes. The LOFAR experiment has shown that a sophisticated treatment of all individually measured amplitudes of a dense antenna array can make the precision comparable with the resolution of existing optical techniques. We develop these ideas further and present a method based on the treatment of time series of measured signals, i.e. each antenna station provides several points (trace) instead of a single one (amplitude or power). We use the measured shower axis and energy as input for CoREAS simulations: for each measured event we simulate a set of air-showers with proton, helium, nitrogen and iron as primary particle (each primary is simulated about ten times to cover fluctuations in the shower maximum due to the first interaction). Simulated radio pulses are processed with the Tunka-Rex detector response and convoluted with the measured signals. A likelihood fit determines how well the simulated event fits to the measured one. The positions of the shower maxima are defined from the distribution of chi-square values of these fits. When using this improved method instead of the standard one, firstly, the shower maximum of more events can be reconstructed, secondly, the resolution is increased. The performance of the method is demonstrated on the data acquired by the Tunka-Rex detector in 2012-2014.

Published
2017
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5. TAIGA-HiSCORE: results from the first two operation seasons

Author

I. V. Yashin, Evgeny Postnikov, V. V. Kindin, Bayarto Lubsandorzhiev, A. A. Petrukhin, Mikhail Panasyuk, B.A. Tarashansky, Yulia Kazarina, V. V. Lenok, Razmik Mirzoyan, Yu. Semeney, E. M. Popescu, Valery Zurbanov, Yaroslav Sagan, B. M. Sabirov, A. Porelli, A. Chiavassa, V. Prosin, Grigory Rubtsov, N. N. Kalmykov, O. A. Gress, A. V. Tkachenko, V. A. Poleschuk, E.G. Popova, A. Sidorenkov, A. N. Dyachok, C. Spiering, V. A. Kozhin, Andrey Sokolov, L. G. Sveshnikova, N. M. Budnev, M. Brueckner, N. B. Lubsandorzhiev, Martin Tluczykont, Yu. Lemeshev, V.A. Tabolenko, S. Kiryuhin, R. D. Monkhoev, T. I. Gress, D. Zhurov, V. Slunecka, E. A. Kravchenko, I. I. Astapov, V. S. Ptuskin, E. E. Korosteleva, A.V. Skurihin, A. Ivanova, P. Kirilenko, L. V. Pankov, A. Garmash, Ralf Wischnewski, L. A. Kuzmichev, R. Nachtigall, R. R. Mirgazov, Dieter Horns, Oleg Fedorov, A. Borodin, A. Pushnin, E. A. Osipova, Pavel Bezyazeekov, V. Boreyko, N. V. Gorbunov, A. Pakhorukov, L. G. Tkachev, V. Samoliga, M. Kunnas, Evgenii V Rjabov, Aleksey Zagorodnikov, K. G. Kompaniets, O. Grishin, Victor Grebenyuk, A. A. Grinyuk, Aleksandr Gafarov, A. A. Silaev, and R. P. Kokoulin

Subjects
Lidar, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Calibration, Environmental science, Cutoff, Sampling (statistics), Cosmic ray, Satellite, Cherenkov radiation, Remote sensing
Abstract

The very to ultra high energy gamma-ray regime up to several 100 TeV is the key to spectrally resolve the cutoff regime of the long-sought Pevatrons, the Galactic cosmic-ray PeV accelerators. One component of the TAIGA hybrid detector is the TAIGA-HiSCORE shower-front sampling timing array, which currently consists of 28 wide angle (0.6\,sr) air Cherenkov timing stations distributed on an area of 0.25 km$^{2}$, and which will be doubled in area by fall 2017. We report on the status and first results of the HiSCORE timing array after the first 2 operation seasons, including calibration studies on timing and pointing, cross calibration with data from the first TAIGA-IACT, observations with the timing array of a LIDAR operating on the ISS, a measurement of the Cosmic Ray spectrum, and a systematic search for high energy gamma-rays from Galactic sources such as the Crab.

Published
2017
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6. Detector efficiency and exposure of Tunka-Rex for cosmic-ray air showers

Author

T. Marshalkina, Yulia Kazarina, R. R. Mirgazov, N. B. Lubsandorzhiev, Oleg Fedorov, V. V. Lenok, A. Pakhorukov, Dmitriy Kostunin, Andreas Haungs, Matthias Kleifges, O. A. Gress, O. Krömer, V. V. Prosin, N. M. Budnev, Frank Schroeder, L. A. Kuzmichev, E. A. Osipova, L. V. Pankov, Pavel Bezyazeekov, R. Hiller, Aleksey Zagorodnikov, D. Chernykh, E. E. Korosteleva, and R. D. Monkhoev

Subjects
Antenna array, Physics, Data acquisition, Astrophysics::High Energy Astrophysical Phenomena, Detector, Monte Carlo method, Antenna aperture, Astrophysics::Instrumentation and Methods for Astrophysics, Cosmic ray, Event (particle physics), Energy (signal processing), Computational physics
Abstract

Tunka-Rex (Tunka Radio Extension) is an antenna array for cosmic-ray detection located in Siberia. Previous studies of cosmic rays with Tunka-Rex have shown high precision in determining the energy of the primary particle and the possibility to reconstruct the depth of the shower maximum. The next step is the reconstruction of the mass composition and the energy spectrum of cosmic rays. One of the main problems appearing within this task is to estimate the detection efficiency of the instrument, and the exposure of the observations. The detection efficiency depends on properties of the primary cosmic rays, such as energy and arrival direction, as well as on many parameters of the instrument: density of the array, efficiency of the receiving antennas, signal-detection threshold, data-acquisition acceptance, and trigger properties. More than that, the configuration of detector changes with time. During the measurements some parts of the detector can provide corrupted data or sometimes do not operate. All these features should be taken into account for an estimation of the detection efficiency. For each energy and arrival direction we estimate the detection probability and effective area of the instrument. To estimate the detection probability of a shower we use a simple Monte Carlo model, which predicts the size of the footprint of the radio emission as function of the primary energy and arrival direction (taking into account the geometry of Earth's magnetic field). Combining these approaches we calculate the event statistics and exposure for each run. This is the first accurate study of the exposure for irregular large-scale radio arrays taking into account most important features of detection, which will be used for the measurement of primary cosmic-ray spectra with Tunka-Rex.

Published
2017
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7. Tunka-133: the New EAS Cherenkov Light Array for Cosmic Ray Study

Author

Yu. A. Semeney, B. A. M. Shaibonov, L. G. Sveshnikova, B. V. Antokhonov, V. S. Ptuskin, E. N. Konstantinov, C. Spiering, A. Chiavassa, S. F. Berezhnev, O. A. Gress, I. V. Yashin, L. V. Pankov, J. Snyder, V. A. Kozhin, M. Stockham, B. K. Lubsandorzhiev, N. N. Kalmykov, V. V. Prosin, A. V. Skurikhin, N. M. Budnev, M. I. Panasyuk, R. R. Mirgazov, A. V. Zablotsky, A.V. Korobchenko, A. N. Dyachok, E.G. Popova, A. A. Silaev, A. V. Zagorodnikov, N. I. Karpov, O. A. Chvalaiev, E. E. Korosteleva, D. Z. Besson, L. A. Kuzmichev, and R. Wischnewski

Subjects
Physics, Astronomy, Cosmic ray, Cherenkov radiation
Published
2011
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