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Optimization of dimensions and inner surface of water cherenkov detector with one photomultiplier tube (PMT)
, Article Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011 ; Volume 5 , 2011 , Pages 240-243 ; Khalaj, P ; Bahmanabadi, M ; Purmohammad, D ; Abdollahi, S ; China Center of Advanced Science and Technology (CCAST); Chinese Academy of Sciences (CAS); Institute of High Energy Physics (IHEP); National Natural Science Foundation of China (NSFC) ; Sharif University of Technology
Abstract
In order to be more precise to find primary cosmic particles directions, nowadays detectors and data analysis for studying secondary particles in extensive air showers have an ongoing progress and water Cherenkov detector is considered as a secondary particle detector. Our aim in this paper is to optimize the size and the inner surface characteristic of a cylindrical water Cherenkov tank with one PMT. By comparing simulation outputs with experiments results, we show that the diffusing inner surface is more practical than the reflective inner surface and we conclude that the optimum height for a diffusing tank with a diameter of 45cm is 60cm
Optimization of dimensions and inner surface of water Cherenkov detector with one photomultiplier tube (PMT) for the Alborz observatory air shower array
, Article Astroparticle Physics ; Volume 35, Issue 12 , July , 2012 , Pages 792-796 ; 09276505 (ISSN) ; Khalaj, P ; Bahmanabadi, M ; Purmohammad, D ; Abdollahi, S ; Sharif University of Technology
2012
Abstract
In order to be more precise to find primary cosmic particles directions, nowadays detectors and data analysis for studying secondary particles in extensive air showers have an ongoing progress and water Cherenkov detector is considered as a secondary particles detector. Our aim in this paper is to optimize the size and the inner surface characteristic of a cylindrical water Cherenkov tank with one PMT in order to use at the Alborz observatory air shower array which consists of 20 plastic scintillation detectors and 10 water Cherenkov detectors. By comparing data gathered by tanks with diffusing and specular reflection inner surfaces, we show that the diffusing inner surface is more...
Optimization of the size of scintillation detectors in order to use in an array of 20 detectors which is going to be placed in the Sharif University of Technology
, Article Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011, 11 August 2011 through 18 August 2011, Beijing ; Volume 3 , 2011 , Pages 40-43 ; Mortazavi Moghaddam, S ; Hedayati, H ; Bahmanabadi, M ; Khalaj, P ; Sharif University of Technology
Institute of High Energy Physics
2011
Abstract
As a primary step of establishment of an extensive air shower array consisting 20 scintillation detectors we optimized an individual detector. Square shaped scintillators are placed under a metal pyramid Light Enclosure with a photomultiplier tube (PMT) at the vertex of it. A set of experiments are performed to optimize the height of light enclosures by comparing 4 different heights 0.1, 0.2, 0.3 and 0.4 m. These experiments are supported by a Monte Carlo simulation of detection process. In this article, by considering experimental and simulation results we concluded that 20 cm is an optimum height for light enclosures
Characterization of etched glass surfaces by wave scattering
, Article Surface and Interface Analysis ; Volume 37, Issue 7 , 2005 , Pages 641-645 ; 01422421 (ISSN) ; Mahdavi, S. M ; Iraji Zad, A ; Kaghazchi, P ; Sharif University of Technology
2005
Abstract
The roughness of glass surfaces after different stages of etching is investigated by reflection measurements with a spectrophotometer, light scattering, atomic force microscopy (AFM, on a small scale) and profilometry (on a large scale). The results suggest that there are three regimes during etching, according to their optical reflectivity and roughness. The first and the second regimes are studied by the Kirchhoff theory and the third one is studied by the optical geometric theory. Also, the roughness obtained by optical scattering is compared with the AFM results. Copyright © 2005 John Wiley & Sons, Ltd
Introducing of Novel Method to Improve the Process of Imaging in a Gamma Camera Equipped with Square PMTs
, M.Sc. Thesis Sharif University of Technology ; Bagheri Shouraki, Saeed (Supervisor) ; Fatemizadeh, Emad (Supervisor) ; Ay, Mohammad Reza (Co-Supervisor)
Abstract
The gamma cameras, based on scintillation crystal followed by an array of photomultiplier tubes (PMTs), play a crucial role in nuclear medicine. The use of square PMTs provides the minimum dead zones in the camera. The camera with squared PMTs also reduces the number of PMTs relative to the detection area.In this thesis, we introduced a new read-out method whereby the total cost of the read-out board will be decreased by a factor of 2.4; in return, the energy and spatial resolution of the system will be reduced by 0.3% and 0.4% respectively. We also implemented a positioning module in the FPGA chip via that the transmission rate between FPGA and the computer will be tripled, and the...