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Project CZELTA. Karel Smolek IEAP CTU. 13.2. 2009. Proje c t CZELTA. CZEch Large-area Time coincidence Array – project of CTU and Silesian University in Opava. Collaboration with Univ. of Alberta (project ALTA, we use the same hardware).
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Project CZELTA Karel Smolek IEAP CTU 13.2. 2009
Project CZELTA • CZEch Large-area Time coincidence Array – project of CTU and Silesian University in Opava. • Collaboration with Univ. of Alberta (project ALTA, we use the same hardware). • Project for the detection of high energy cosmic rays (>1014 eV). • Stations are installed at roofs of high schools->educational impact . Shower of particles of secondary cosmic rays.
PC HV Detection station Primary particle Scheme of the scintillating detector Interaction in the atmosphere • 3 scintillators with photomultipliers in a triangle with a site ~10 m, work in a coincidence=> detection of showers with the energy> 1014 eV. • GPS for precise time-labeling of detected showers (precision ~10 ns) => it is possible to study space and time coincidence of the detected showers. Shower of secondary particles U [V] channel 1 channel 2 channel 3 t [ns]
Hardware of the detection station Metal tube with other cables: - high voltage for photomultiplier - signal cables from photomultiplier - cable to testing LED diode - cable for controlling of thermostat Thin metal tubewith cable 230 V GPS antenna Socket of 230 V (heating) Thermostat Wooden box With scintillating detector Outer box with temperature insulation Heating cable
Light guide Photomultiplier Testing LED diode Scintillator
Electronics Crates GPS receiver PC UPS
Meteorological station • Flux of detected showers is correlated with the atmospheric pressure. • We provide the detection stations with the meteorological station, measured data are automatically stored on PC. • Collaboration with the Czech Hydrometeorological Institute –they provide us all necessary historical data measured with the professional stations. Disadvantage: for some detection stations, the professional station is not near.
Present situation of the project • Production of detection stations in the CR • electronic boards produced in Awos Pardubice • scintillators produced in JINR Dubna in Russia • First two stations installed in Prague and Opava: • IEAP CTU – 2004 • Silesian University in Opava – 2005 • Next three stations installed in high schools: • High school in Pardubice - 2006 • Mendel’s high school in Opava - 2006 • High school in Kladno - 2007
CZELTA stations in the Czech Republic station in operation station in preparation Locations of detection stations
Web-based interface • New functionality added.
Dt Analysis of measured data • The aim is to build the global network of detection stations on the Earth = huge „telescope” for detection of cosmic rays showers. • In the measured data, unusual events are searched: • sudden increase of rate of showers • simultaneous detection of showers with distant stations • Minimal energy of a primary particle, which can produce a detectable shower of secondary particles: 1014 eV. • The timing resolution of the GPS time difference between distant sites: ~16 ns. • It is possible to reconstruct the direction of the flight of a primary particle. • Uncertainty of reconstructed altitude angleθ of a primary particle: δθ = 4°/sin(θ) • Uncertainty of reconstructed azimuth angleφ of a primary particle: δφ = 5°
Conclusion • Study of high energy cosmic rays is popular part of modern physical research. • At present, the Czech Republic is involved in the unique global project of detection of high energy cosmic rays. • The CZELTA project will help to solve present problems of cosmic rays. • Secondary purpose of the project is to attract young students from high schools to physics, mathematics and computer sciences.