| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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High-Yield High-Efficiency Positron Generation in High-$Z$ Metal Targets Irradiated by Laser Produced Electrons from Near-Critical Density Plasmas |
| Wei Song1, Rong-Hao Hu1, Yin-Ren Shou1, Zheng Gong1, Jin-Qing Yu1, Chen Lin1, Wen-Jun Ma1, Yan-Yin Zhao1, Hai-Yang Lu1,2**, Xue-Qing Yan1,2** |
1State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871
2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006
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| Cite this article: |
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Wei Song, Rong-Hao Hu, Yin-Ren Shou et al 2017 Chin. Phys. Lett. 34 085201 |
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Abstract An improved indirect scheme for laser positron generation is proposed. The positron yields in high-$Z$ metal targets irradiated by laser produced electrons from near-critical density plasmas and underdense plasma are investigated numerically. It is found that the positron yield is mainly affected by the number of electrons of energies up to several hundreds of MeV. Using near-critical density targets for electron acceleration, the number of high energy electrons can be increased dramatically. Through start-to-end simulations, it is shown that up to $6.78\times10^{10}$ positrons can be generated with state-of-the-art Joule-class femtosecond laser systems.
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Received: 06 April 2017
Published: 22 July 2017
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| PACS: |
52.38.-r
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(Laser-plasma interactions)
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41.75.Ht
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(Relativistic electron and positron beams)
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41.75.Jv
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(Laser-driven acceleration?)
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52.38.Kd
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(Laser-plasma acceleration of electrons and ions)
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| Fund: Supported by the National Basic Research Program of China under Grant No 2013CBA01502, the National Natural Science Foundation of China under Grant Nos 11575011 and 11535001, the National Grand Instrument Project under Grant No 2012YQ030142, and the UK EPSRC under Grant Nos EP/G054950/1, EP/G056803/1, EP/G055165/1 and EP/M022463/1. |
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