IEAP CTU Project CZELTA Karel Smolek IEAP CTU 13.2. 2009

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Text of IEAP CTU Project CZELTA Karel Smolek IEAP CTU 13.2. 2009

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.
U [V]
t [ns]
channel 1
channel 2
channel 3
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.
Primary particle
Thin metal tube with cable 230 V
Metal tube with other cables:
- high voltage for photomultiplier
- signal cables from photomultiplier
GPS antenna
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.
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
Next three stations installed in high schools:
High school in Pardubice - 2006
Mendel’s high school in Opava - 2006
High school in Kladno - 2007
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 angle θ of a primary particle:
δθ = 4°/sin(θ)
Uncertainty of reconstructed azimuth angle φ of a primary particle: δφ = 5°
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.