2022, Шульженко, Иван Андреевич, Яшин, Игорь Иванович, Хохлов, Семен Сергеевич, Кокоулин, Ростислав Павлович, Громушкин, Дмитрий Михайлович, Богданов, Алексей Георгиевич, Петрухин, Анатолий Афанасьевич, Барбашина, Наталья Сергеевна, Pasyuk, N. A., Kokoulin, R. P., Kindin, V. V., Khokhlov, S. S., Gromushkin, D. M., Bogdanov, A. G., Barbashina, N. S., Shutenko, V. V., Shulzhenko, I. A., Petrukhin, A. A., Yashin, I. I., Amelchakov, M. B., Kompaniets, K. G., Konovalova, A. Y., Ovchinnikov, V. V., Yurin, K. O., Пасюк, Никита Александрович, Шутенко, Виктор Викторович, Овчинников, Вячеслав Васильевич, Коновалова, Алена Юрьевна, Компаниец, Константин Георгиевич, Киндин, Виктор Владимирович, Амельчаков, Михаил Борисович

The Experimental complex NEVOD includes several different setups for studying various components of extensive air showers (EAS) in the energy range from 1010 to 1018eV. The NEVOD-EAS array for detection of the EAS electron–photon component began its data taking in 2018. It is a distributed system of scintillation detectors installed over an area of about 104 m2. A distinctive feature of this array is its cluster organization with different-altitude layout of the detecting elements. The main goal of the NEVOD-EAS array is to obtain an estimation of the primary particle energy for events measured by various detectors of the Experimental complex NEVOD. This paper describes the design, operation principles and data processing of the NEVOD-EAS array. The criteria for the event selection and the accuracy of the EAS parameters reconstruction obtained on the simulated events are discussed. The results of the preliminary analysis of experimental data obtained during a half-year operation are presented.

2019, Likiy, O. I., Amelchakov, M. B., Bogdanov, A. G., Chiavassa, A., Khokhlov, S. S., Kokoulin, R. P., Shulzhenko, I. A., Амельчаков, Михаил Борисович, Богданов, Алексей Георгиевич, Хохлов, Семен Сергеевич, Кокоулин, Ростислав Павлович, Шульженко, Иван Андреевич

© 2019, Pleiades Publishing, Ltd.In 2018, the creation of the central part of the NEVOD-EAS cluster-type array aimed at detection of the electron-photon component of extensive air showers in the energy range from 1015 to 1017 eV was completed. At present, a continuous data taking is being performed at the array. The results of the reconstruction of registered extensive air showers using the methods developed within the framework of the cluster approach to experimental data analysis are presented.

2019, Mannocchi, G., Trinchero, G., Amelchakov, M. B., Barbashina, N. S., Bogdanov, A. G., Gromushkin, D. M., Zadeba, E. A., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Chiavassa, A., Likiy, O. I., Petrukhin, A. A., Stenkin, Y. V., Khokhlov, S. S., Shulzhenko, I. A., Shutenko, V. V., Yurin, K. O., Yashin, I. I., Амельчаков, Михаил Борисович, Барбашина, Наталья Сергеевна, Богданов, Алексей Георгиевич, Громушкин, Дмитрий Михайлович, Задеба, Егор Александрович, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Петрухин, Анатолий Афанасьевич, Стенькин, Юрий Васильевич, Хохлов, Семен Сергеевич, Шульженко, Иван Андреевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

© 2019, Allerton Press, Inc.Abstract: The NEVOD experimental complex was created at MEPhI. It includes several facilities for studying the electron–photon, muon, and hadron components of the EAS in the energy range of 1 PeV to 1 EeV. This work presents the first results for two months of the joint operation of five facilities (NEVOD-EAS, CWD, CTS, PRISMA-32, and DECOR). The problems of synchronizing the facilities and selecting joint events are considered. The experimental data of these facilities are analyzed for different components of the EAS in overlapping energy ranges.

2024, Amelchakov, M. B., Bogdanov, A. G., Gromushkin, D. M., Dmitrieva, A. N., Karetnikova, T. A., Khokhlov, S. S., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Konovalova, A. Y., Pasyuk, N. A., Petrukhin, A. A., Shulzhenko, I. A., Shutenko, V. V., Yashin, I. I., Амельчаков, Михаил Борисович, Богданов, Алексей Георгиевич, Громушкин, Дмитрий Михайлович, Дмитриева, Анна Николаевна, Каретникова, Татьяна Александровна, Хохлов, Семен Сергеевич, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Коновалова, Алена Юрьевна, Пасюк, Никита Александрович, Петрухин, Анатолий Афанасьевич, Шульженко, Иван Андреевич, Шутенко, Виктор Викторович, Яшин, Игорь Иванович

In this paper, we describe the quasi-spherical optical module QSM-6M to detect Cherenkov radiation in water. The module is based on six photomultiplier tubes (PMTs) with flat photocathodes Hamamatsu R877. We discuss the results of the photomultiplier testing, as well as the choice of the high-voltage divider providing the PMT dynamic range from 1 to 105 photoelectrons. The techniques for studying QSM-6M characteristics, as well as the results of the underwater testing of the module for an 18-month period are presented. We also present the results of the analysis of the QSM-6M response to single-muon and multiparticle events detected by the installations of the Experimental Complex NEVOD.

2023, Amelchakov, M. B. , Konovalova, A. Yu. , Nugaeva, K. R., Pochestnev, A. D. , Yuzhakova, E. A. , Хохлов, Семен Сергеевич, Петрухин, Анатолий Афанасьевич, Шульженко, Иван Андреевич, Кокоулин, Ростислав Павлович, Богданов, Алексей Георгиевич, Громушкин, Дмитрий Михайлович, Дмитриева, Анна Николаевна, Bogdanov, A. G., Gromushkin, D. M., Dmitrieva, A. N., Kokoulin, R. P., Konovalova, A. Y., Nugaeva, K. R., Petrukhin, A. A., Pochestnev, A. D., Khokhlov,S. S., Shulzhenko, I. A., Yuzhakova, E. A., Amelchakov, M. B., Нугаева, Корнелия Рустемовна, Коновалова, Алена Юрьевна, Почестнев, Андрей Дмитриевич, Амельчаков, Михаил Борисович, Южакова, Елена Александровна

Parameters of extensive air showers detected by the facilities of the NEVOD Experimental Complex are analyzed and compared with events simulated. The calibration and energy threshold of the NEVOD-EAS detector are discussed, as well as the results of retrieval of the axis directions from the NEVOD-EAS and DECOR data. An example of the event detected by all facilities of the complex is given.

2021, Mannocchi, G., Trinchero, G., Yashin, I. I., Amelchakov, M. B., Astapov, I. I., Barbashina, N. S., Bogdanov, A. G., Bogdanov, F. A., Borog, V. V., Chiavassa, A., Dmitrieva, A. N., Gromushkin, D. M., Khokhlov, S. S., Kindin, V. V., Kokoulin, R. P., Kompaniets, K. G., Konovalova, A. Y., Kovylyaeva, A. A., Mishutina, Y. N., Ovchinnikov, V. V., Petrukhin, A. A., Shulzhenko, I. A., Shutenko, V. V., Stenkin, Y. V., Vorobyev, V. S., Yurin, K. O., Yurina, E. A., Zadeba, E. A., Яшин, Игорь Иванович, Амельчаков, Михаил Борисович, Астапов, Иван Иванович, Барбашина, Наталья Сергеевна, Богданов, Алексей Георгиевич, Борог, Владимир Викторович, Дмитриева, Анна Николаевна, Громушкин, Дмитрий Михайлович, Хохлов, Семен Сергеевич, Киндин, Виктор Владимирович, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Коновалова, Алена Юрьевна, Мишутина, Юлия Николаевна, Овчинников, Вячеслав Васильевич, Петрухин, Анатолий Афанасьевич, Шульженко, Иван Андреевич, Шутенко, Виктор Викторович, Стенькин, Юрий Васильевич, Воробьев, Владислав Станиславович, Юрина, Екатерина Александровна, Задеба, Егор Александрович

© 2021 IOP Publishing Ltd and Sissa Medialab.The Experimental Complex (EC) NEVOD includes a number of detectors used to carry out basic research of cosmic rays (CR) and their interactions in the energy range 1011-1019 eV and applied research of the heliosphere, magnetosphere and atmosphere of the Earth by the muonography method which is based on the analysis of spatial-angular variations of the muon flux generated by primary CR particles with energies of 10

2023, Amelchakov, M. B., Bogdanov, A. G., Dmitrieva, A. N., Gromushkin, D. M., Khomchuk, E. P., Khokhlov, S. S., Kokoulin, R. P., Kompaniets, K. G., Konovalova, A. Y., Nugaeva, K. R., Petrukhin, A. A., Shulzhenko, I. A., Yashin, I. I., Yuzhakova, E. A., Амельчаков, Михаил Борисович, Богданов, Алексей Георгиевич, Дмитриева, Анна Николаевна, Громушкин, Дмитрий Михайлович, Хомчук, Евгений Павлович, Хохлов, Семен Сергеевич, Кокоулин, Ростислав Павлович, Компаниец, Константин Георгиевич, Коновалова, Алена Юрьевна, Нугаева, Корнелия Рустемовна, Петрухин, Анатолий Афанасьевич, Шульженко, Иван Андреевич, Яшин, Игорь Иванович, Южакова, Елена Александровна

In this paper we discuss the calibration of the NEVOD-EAS array which is a part of the Experimental Complex NEVOD, as well as the results of studying the response features of its scintillation detectors. We present the results of the detectors energy calibration, performed by comparing their response to different types of particles obtained experimentally and simulated with the Geant4 software package, as well as of the measurements of their timing resolution. We also discuss the results of studies of the light collection non-uniformity of the NEVOD-EAS detectors and of the accuracy of air-shower arrival direction reconstruction, which have been performed using other facilities of the Experimental Complex NEVOD: the muon hodoscope URAGAN and the muon tracking detector DECOR.

2019, Izhbulyakova, Z. T., Amelchakov, M. B., Vorobyev, V. S., Kovylyaeva, A. A., Kokoulin, R. P., Khohlov, S. S., Амельчаков, Михаил Борисович, Воробьев, Владислав Станиславович, Кокоулин, Ростислав Павлович, Хохлов, Семен Сергеевич

© 2019 Published under licence by IOP Publishing Ltd. The work is devoted to the study of the anisotropy of the high energy cosmic ray flux by means of muon bundles registered during 2012-2018 with the coordinate-tracking detector DECOR, which is a part of the Unique Scientific Facility Experimental complex NEVOD. We have analyzed data for two event samples corresponding to E > 10 15 eV and E > 10 16 eV energy ranges of primary particles. The method of data processing is described and estimates of the dipole anisotropy parameters (the amplitude and the phase) are presented.

2019, Amelchakov, M. B., Bogdanov, A. G., Khokhlov, S. S., Kokoulin, R. P., Petrukhin, A. A., Shulzhenko, I. A., Yashin, I. I., Амельчаков, Михаил Борисович, Богданов, Алексей Георгиевич, Хохлов, Семен Сергеевич, Кокоулин, Ростислав Павлович, Петрухин, Анатолий Афанасьевич, Шульженко, Иван Андреевич, Яшин, Игорь Иванович

© 2019, Pleiades Publishing, Ltd.The results of the long-term measurements of extensive air showers with the calibration telescope system of the Cherenkov water detector are presented for an energy range of 1014–1017 eV. We have used two independent methods for reconstruction of the charged particle local density spectrum: by the multiplicity of the hit counters and by their amplitude responses. By means of Geant4 calculations, we have shown how the structure of the building and the water tank affect the results of the spectrum reconstruction. We obtained two different exponents of charged particles’ local density spectra for CTS top and bottom plane. The results are compared with CORSIKA calculations and data from other setups.

2023, Amelchakov, M. B., Bogdanov, A. G., Dmitrieva, A. N., Kompaniets, K. G., Khokhlov, S. S., Kokoulin, R., Petrukhin, A. A., Shutenko, V. V., Shulzhenko, I. A., Yashin, I. I., Yurina, E. A., Амельчаков, Михаил Борисович, Богданов, Алексей Георгиевич, Дмитриева, Анна Николаевна, Компаниец, Константин Георгиевич, Хохлов, Семен Сергеевич, Кокоулин, Ростислав Павлович, Петрухин, Анатолий Афанасьевич, Шутенко, Виктор Викторович, Шульженко, Иван Андреевич, Яшин, Игорь Иванович, Юрина, Екатерина Александровна

Abstract In this work, we use muon bundles, which are formed in extensive air showers and detected at the ground level, as a tool for searching for anisotropy in high-energy cosmic rays. Such choice is explained by the penetrating ability of muons that allows them to retain the direction of primary particles with good accuracy. In 2012–2022, we performed long-term muon-bundle detection with the coordinate-tracking detector DECOR, which is a part of the Experimental Complex NEVOD (MEPhI, Moscow). To search for cosmic-ray anisotropy, muon bundles arriving at zenith angles in the range from 15° to 75° in the local coordinate system are used. During the entire period of data taking, about 14 million of such events have been accumulated. In this paper, we describe some methods developed in the Experimental Complex NEVOD and implemented in our research, including: the method for compensating for the influence of meteorological conditions on the intensity of muon bundles at the Earth’s surface, the method for accounting for the design features of the detector and the inhomogeneity of the detection efficiency for different directions, as well as the method for estimating the primary energies of cosmic rays. Here we present the results of the search for the dipole anisotropy of cosmic rays with energies in the PeV region and also compare them with the results obtained at other scientific facilities.