Experimental Complex NEVOD Research Articles

Cherenkov Water Detector NEVOD: A New Stage of Development

The new detecting system of the Cherenkov water detector of the Unique Scientific Facility “Experimental complex NEVOD” located at the ground level is described. During the development of the detecting system, two tasks have been solved: providing a hodoscopic mode for registration of single muon tracks in 4π-geometry and a calorimetric mode for measurements of the energy deposit of cascades and high-multiplicity muon bundles.

Calibration Telescope System of CWD NEVOD as a Detector of Electron and Muon Components of EAS

The paper describes the system of calibration telescopes as a part of the experimental complex NEVOD. The setup operation parameters were analysed during experimental series from 01/06/2013 to 21/01/2015. The technique of the charged particle local density spectrum reconstruction is described. The results of the local density spectrum measurements are presented for the EAS electron and muon components in different energy ranges of primary cosmic rays.

A novel type of EAS recording array: First results

The prototype of a novel type EAS (extensive air shower) recording and investigation array (the PRISMA project) is created on the basis of the NEVOD experimental complex through cooperation between Institute for Nuclear Research, Russian Academy of Sciences, and the National Research Nuclear University MEPhI. The prototype (ProtoPRISMA) consists of thirty-two en-detectors sensitive to EAS electromagnetic (e) and hadronic (via the registration of thermal neutrons) (n) components. The array is designed to develop and to test a new method of EAS investigation using neutron and electromagnetic components and to obtain preliminary data on the spectrum and composition of cosmic rays.

Proposal of NEVOD-EAS shower array

New setup for detection of EAS electromagnetic component at the knee region of primary energies is under construction on the basis of the experimental complex NEVOD (Moscow, Russia). The measuring system of the EAS array has a cluster organization. Clusters are located on the roofs of laboratory buildings of MEPhI (Moscow). Features of measuring and DAQ systems, results of investigations of characteristics of a single counter and the event formation algorithm from the data of separate clusters are discussed.

The URAGAN wide-aperture large-area muon hodoscope

The URAGAN wide-aperture large-area multilayer muon hodoscope is developed for the NEVOD experimental complex of the Moscow Engineering Physics Institute. The hodoscope will be used to study atmospheric and heliospheric processes responsible for variations in the muon flux at the Earth’s surface. The structures of the detector and its system of data acquisition and processing are described. The data obtained during continuous sets of measurements in 2005–2006 using the first two supermodules of the setup are analyzed, and preliminary results of this analysis are discussed.

HYDRA hydroacoustic antenna in the NEVOD experimental complex

The main characteristics of the HYDRA hydroacoustic antenna intended for the detection of signals generated by cores of extensive air showers in a water Cherenkov detector involved in the NEVOD experimental complex are considered. Primary attention is focused on the calibration of antenna sensors and on the selection of an optimum trigger that ensures an effective detection of acoustic signals generated by cores of extensive air showers in the water volume of the Cherenkov detector.

Cluster of scintillation counters for the shower array in the NEVOD EAS project

A shower array for investigations of primary cosmic rays in the knee region in the energy spectrum of extensive air showers is being designed on the basis of the NEVOD experimental complex. Features of the cluster organization of the array and the results of the study of the characteristics of both the basic scintillation counter and the counter cluster, which is the basic element for triggering, detecting, and data collection and treatment systems, are discussed.