| A positron source using an axially oriented crystal associated to a granular amorphous converter |
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| 作者姓名： | 徐成海 Robert Chehab Peter Sievers Xavier Artru Michel Chevallier Olivier Dadoun 裴国玺 Vladimir M. Strakhovenko Alessandro Variola |
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| 作者单位： | 1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;;2. Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université de Paris-Sud, BP 34-91898, Orsay cedex, France;;3. Institut de Physique Nucléaire de Lyon, IN2P3/CNRS et Université Lyon 1, 69622 Villeurbanne, France;;4. CERN, CH-1211, Genéve 23, Switzerland;;5. Budker Institute of Nuclear Physics, Av. Lavrentyeva, 11, 630090 Novosibirsk, Russia |
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| 摘 要： | A non-conventional positron source using the intense γ radiation from an axially oriented monocrystal which materializes into e+e- pairs in a granular amorphous converter is described. The enhancement of photon radiation by multi-GeV electrons crossing a tungsten crystal along its <111> axis is reported. The resulting enhancement of pair production in an amorphous converter placed 2 meters downstream, is also reported. Sweeping off the charged particles from the crystal by a bending magnet upstream of the converter allows a significant reduction of the deposited energy density. Substituting a granular target made of small spheres for the usual compact one, makes the energy dissipation easier. The deposited energy and corresponding heating are analyzed and solutions for cooling are proposed. The configurations studied here for this kind of positron source allow its consideration for unpolarized positrons for the ILC.
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| 关 键 词： | channeling effect crystal positron source ILC |
| 收稿时间： | 2011-12-6 |
| 修稿时间： | 2012-1-16 |
A positron source using an axially oriented crystal associated to a granular amorphous converter |
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| Institution: | XU Cheng-Hai 1,2 Robert Chehab 3 Peter Sievers 4 Xavier Artru 3 Michel Chevallier 3 Olivier Dadoun 2 PEI Guo-Xi 1 Vladimir M.Strakhovenko 5 Alessandro Variola 2 1 Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China 2 Laboratoire de l’Accélérateur Linéaire,IN2P3/CNRS et Université de Paris-Sud,BP 34-91898,Orsay cedex,France 3 Institut de Physique Nucléaire de Lyon,IN2P3/CNRS et Université Lyon 1,69622 Villeurbanne,France 4 CERN,CH-1211,Genéve 23,Switzerland 5 Budker Institute of Nuclear Physics,Av.Lavrentyeva,11,630090 Novosibirsk,Russia |
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| Abstract: | A non-conventional positron source using the intense γ radiation from an axially oriented monocrystal which materializes into e + e pairs in a granular amorphous converter is described.The enhancement of photon radiation by multi-GeV electrons crossing a tungsten crystal along its <111> axis is reported.The resulting enhancement of pair production in an amorphous converter placed 2 meters downstream,is also reported.Sweeping off the charged particles from the crystal by a bending magnet upstream of the converter allows a significant reduction of the deposited energy density.Substituting a granular target made of small spheres for the usual compact one,makes the energy dissipation easier.The deposited energy and corresponding heating are analyzed and solutions for cooling are proposed.The configurations studied here for this kind of positron source allow its consideration for unpolarized positrons for the ILC. |
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| Keywords: | channeling effect crystal positron source ILC |
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