Dissertation > Astronomy,Earth Sciences > Astronomy > Astronomical facilities and observational data > Astronomical instruments > Celestial observation instruments

The Development of Air Shower Core Detector

Author LiJinYang
Tutor JiaHuanYu
School Southwest Jiaotong University
Course Theoretical Physics
Keywords Cosmic ray Air shower shaft PMT
CLC P111.3
Type Master's thesis
Year 2011
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Explore the universe of human footsteps never stay too, the origin of cosmic rays as the world's one of the most controversial topics, people are still discussing. Research knee region (1015eV-1016eV) cosmic ray composition, accurate measurement of the single-component spectrum, will be able to reveal the origin of cosmic rays knee region. China Lhasa, Tibet Damxung Yangpachen town, elevation 4300 m, corresponding to the atmospheric depth of about 606g/cm2. Primordial energy in the \So with high accuracy. Yangbajing Air shower Core detector (YAC) with advanced data analysis methods, observation stations in the same universe Yangpachen extensive air shower array and underground muon detector array joint operation. It is possible to record intact \This article focuses on the core of the air shower axis detector development. As part of YAC-Ⅱ fiber scintillator detector detector detector in the axial core development process first introduced fiber scintillator detector works. On this basis against YAC-Ⅱ detector structure and development process were introduced, taking into account conneted special natural environment and climate conditions, the experimental group using a leak light, waterproof, anti-corrosion and good insulation properties design, in order to be more safe, but also on YAC-Ⅱ detector shield optimized processing. About how to select each device inside the detector in order to meet the requirement of experiment conducted a feasibility analysis, including the stereotype thickness options, fiber scintillator choice, photomultiplier tubes, and the choice of the back-end electronics, magnetic shielding tube selection, power lines, signal lines and some of the performance of the test connector and so on. The results of the feasibility analysis based on the performance of the various components of the test, the test results show that the performance of the detector YAC-Ⅱ meet expectations. In order to detect a photomultiplier tube detector measurement range is to meet the requirements, the experimental group utilized Beijing Electron Positron Collider Detector linac beam on the sample through a rigorous calibration, which includes two different type photomultiplier (R5325, R4125) and the linear range of the saturation effect of the scintillator. Experimental results show that a high gain R4125 photomultiplier dynamic range is 1 to thousands of electron e; R5125 photomultiplier low gain dynamic range is a few hundred to millions of electron electrons. This indicates that YAC-Ⅱ detector can achieve a good measure 50TeV-10PeV dynamic range. Finally, the YAC-Ⅰ detector observed experimentally various physical parameters were analyzed by means of the various physical quantities of selected high-energy shaft case, the experiment observed physical quantity reflecting different primary cosmic line nuclides information. These results YAC-Ⅱ and physical experimental data analysis to achieve the objective foundation.

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