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.
The technique of cascade shower energy measurements by means of Cherenkov water detector (CWD) NEVOD with a spatial lattice of quasi-spherical modules (QSM) is discussed. A dense QSM spacing allows ...to reconstruct the number of cascade particles along the shower axis on the basis of amplitude responses of PMTs. The technique of cascade curve reconstruction was applied to showers generated in water by nearly horizontal high energy muons selected by means of the coordinate detector DECOR deployed around the CWD. First results of cascade energy spectrum measurements are presented.
Status of the NEVOD-EAS experiment Shulzhenko, I. A.; Amelchakov, M. B.; Ampilogov, N. V. ...
Bulletin of the Russian Academy of Sciences. Physics,
03/2015, Letnik:
79, Številka:
3
Journal Article
Recenzirano
The NEVOD-EAS setup is designed for independent estimation of the EAS parameters recorded in the NEVOD-DECOR experiment in the region of the energy spectrum knee. The setup’s recording system is ...based on the clusters of scintillation detectors for the EAS electron-photon component, located on the territory of MEPhI. Characteristics of the shower array recording system that ensure detection, data acquisition and primary processing, and the time synchronization of clusters are discussed, along with results of studying the nonuniformity of NEVOD-EAS scintillation detector responses.
An approach to the estimating the parameters of cascade showers with unknown axes, generated in NEVOD Cherenkov water detector (CWD) by muons with zenith angles in the range from 50° to 90°, is ...described. A technique for estimating the position of a cascade axis using the CWD response is proposed, along with criteria that would allow us to select events with cascades from ones with intense releases of energy. The technique and the criteria are tested on cascades generated by near-horizon high-energy muons, registered by the DECOR tracking detector. Preliminary results from measuring the energy spectrum of cascade showers are presented.
The NEVOD-EAS air-shower array Amelchakov, M.B.; Barbashina, N.S.; Bogdanov, A.G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2022, Letnik:
1026
Journal Article
Recenzirano
Odprti dostop
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.
The first results from studying the energy deposits of inclined muon bundles in a Cherenkov water detector on the Earth’s surface are presented. The general response of the NEVOD Cherenkov ...calorimeter’s PMT is used as a measure of the energy deposited (proportional to the muon energy losses in the detector’s matter), while the local muon density at the point of observation is estimated using data from the DECOR coordinate-tracking detector. It is found that the energy deposit normalized to the muon density depends largely on the zenith angle. A comparison of the experimental results and those from EAS muon component simulations using the CORSIKA package shows that the average energy of muons detected in the bundles grows rapidly as the zenith angle increases, reaching ∼500 GeV near the horizon.
Cascade showers in the Cherenkov light in water Khokhlov, S.S.; Bogdanov, A.G.; Khomyakov, V.A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2020, Letnik:
952
Journal Article
Recenzirano
Cascade showers induced by muons have been studied in the Cherenkov water detector NEVOD with a dense spatial lattice of quasi-spherical measuring modules. The cascades from near-horizontal muons ...with tracks determined by means of the coordinate-tracking detector were investigated. The results of measurements of the spatial distribution of Cherenkov radiation from cascade particles in such events are presented.
Muon detector of the Tunka-HiSCORE project Yashin, I. I.; Barbashina, N. S.; Bogdanov, A. G. ...
Bulletin of the Russian Academy of Sciences. Physics,
03/2015, Letnik:
79, Številka:
3
Journal Article
Recenzirano
The use of muon detectors in order to improve the rejection of background EAS produced by protons and nuclei is proposed as part of the wide-aperture Tunka-HiSCORE γ-ray telescope project. The area ...of the muon detector and the depth of the bulk soil layer required for effective suppression of the electron-photon component of EAS are substantiated. Results from tests of the IHEP muon detector with light collected by WLS fibers are discussed.
New results from investigating the flux of atmospheric muons scattered from the ground to the upper hemisphere, obtained with the NEVOD-DECOR experimental complex from December 2011 to March 2013, ...are presented.
Results from studying the amplitude response of PMTs and estimating the probability of correctly determining the direction of a particle track using quasispherical modules for different water ...transparencies and detection thresholds are described. Events are selected by the scintillation counters of the system of calibration telescopes and supermodules of the DECOR coordinate-tracking detector. Experimental data obtained before and after the startup of a new water purification system are used in the analysis.
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