Optimization of positrons generation based on laser wakefield electron acceleration

Optimization of positrons generation based on laser wakefield electron acceleration
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基于激光尾场电子加速的正电子产生优化

DOI:
10.1103/physrevaccelbeams.19.081303
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发表时间:
2016-08
影响因子:
1.7
通讯作者:
Gu Yuqiu
Gu Yuqiu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wu Yuchi;Han Dan;Zhang Tiankui;Dong Kegong;Zhu Bin;Yan Yonghong;Gu Yuqiu

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激光正电子是一种脉冲宽度短、电荷密度高的新型粒子源。本文对基于激光尾场电子加速(LWFA)的正电子产生进行了理论研究。结合LWFA和级联簇射理论,得到了正电子能谱和产额的解析表达式。最大正电子产额和相应的转换器厚度作为驱动激光功率的函数进行了优化。在最佳条件下,高功率飞秒激光在ELI-NP上可以产生能量高达5×10的正电子产额(>100 MeV)。正电子的百分比表明,当转换器厚度大于5个辐射长度时,可以产生准中性电子-正电子喷注。
Laser based positron represents a new particle source with short pulse duration and high charge density. Positron production based on laser wakefield electron acceleration (LWFA) has been investigated theoretically in this paper. Analytical expressions for positron spectra and yield have been obtained through a combination of LWFA and cascade shower theories. The maximum positron yield and corresponding converter thickness have been optimized as a function of driven laser power. Under the optimal condition, high energy (>100 MeV) positron yield up to 5 × 10 can be produced by high power femtosecond lasers at ELI-NP. The percentage of positrons shows that a quasineutral electron-positron jet can be generated by setting the converter thickness greater than 5 radiation lengths.
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