Computer Simulation for the Real-Sized Electron-Positron Converter on BEPC-LINAC Based Slow Positron Beam

YU Run-Sheng; WANG Bao-Yi; MA Chuang-Xin; CAO Xing-Zhong; PEI Guo-Xi; WEI Long; YE Ming-Han

Chinese Physics C> 2001, Vol. 25> Issue(S1) : 135-139

Computer Simulation for the Real-Sized Electron-Positron Converter on BEPC-LINAC Based Slow Positron Beam

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039,China

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Abstract：
This paper describes the simulation by EGS4 code for the positron converter on BEPC LINAC-based slow positron beam and the radiation shield.Results show that the slow positron yield will be 3.5×10⁶e⁺/s(Ta target,1.5cm thick,φ10mm)or 4.3×10⁶e⁺/s(W target,1.3cm thick,φ10mm) when the LINAC is running under the parasitic mode.Meanwhile,the slow positron yield will be 4.7×10⁸e⁺/s(Ta target,1.3cm thick,φ10mm)or 5.9×10⁸e⁺/s(W target,1.1cm thick,φ10mm) when the LINAC is running under the long-pulse-width mode.A 3m thick concrete wall inserted with a 1m long×1m wide×0.2m thick Fe plate is needed for the radiation shield and placed behind the positron converter.

References

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Begemann M, Graff G, Herminghaus H et al. Nucl. Instr. and Meth., 1982, 201:2872 Howell R H, Fluss M J, Rosenberg 1 J et al. Nucl. Instr. and Meth., 1985, B10/11:3733 Tanaka H, Nakanishi T. Nucl. Instr. and Meth., 1991, B62:2594 Okada S, Sunaga H. Nucl. Instr. and Meth., 1991, B56/57:6045 Kurihara T, Shirakaw A, Enomoto A et al. Applied Surface Science, 1995, 85:1786 Kanazawa I, Ito Y, Hirose M et al. Applied Surface, 1995, 85:1247 Suzuki R, Kobayashi Y, Mikado T et al. Mat. Sci. Forum, 1992, 105-110:19938 Ley R. Mat. Sci. Forum, 1992, 105-110:1927-19309 Mohri A, Tanaka H, Yuyama T. Mat. Sci. Forum, 1995, 175-178:96710 YU Runsheng, WEI Long, PEI Guoxi et al. Nuclear Techniques, 2000, 23(6):40511 Walter R. Nelson, Hideo Hirayama, David W.O. Rogers. The EGS4 Code System, Stanford University, SLAC-265 Report. 1985

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YU Run-Sheng, WANG Bao-Yi, MA Chuang-Xin, CAO Xing-Zhong, PEI Guo-Xi, WEI Long and YE Ming-Han. Computer Simulation for the Real-Sized Electron-Positron Converter on BEPC-LINAC Based Slow Positron Beam[J]. Chinese Physics C, 2001, 25(S1): 135-139.

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Computer Simulation for the Real-Sized Electron-Positron Converter on BEPC-LINAC Based Slow Positron Beam

Corresponding author: YU Run-Sheng,

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039,China

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 2001-06-22

Abstract: This paper describes the simulation by EGS4 code for the positron converter on BEPC LINAC-based slow positron beam and the radiation shield.Results show that the slow positron yield will be 3.5×10⁶e⁺/s(Ta target,1.5cm thick,φ10mm)or 4.3×10⁶e⁺/s(W target,1.3cm thick,φ10mm) when the LINAC is running under the parasitic mode.Meanwhile,the slow positron yield will be 4.7×10⁸e⁺/s(Ta target,1.3cm thick,φ10mm)or 5.9×10⁸e⁺/s(W target,1.1cm thick,φ10mm) when the LINAC is running under the long-pulse-width mode.A 3m thick concrete wall inserted with a 1m long×1m wide×0.2m thick Fe plate is needed for the radiation shield and placed behind the positron converter.