Ultrashort-pulse MeV positron beam generation from intense Compton-scattering γ-ray source driven by laser wakefield acceleration
Ultrashort-pulse MeV positron beam generation from intense Compton-scattering γ-ray source driven by laser wakefield acceleration
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DOI：
10.1017/s0263034612000948
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发表时间：
2013-03
影响因子：
0.9
通讯作者：
W. Luo;H. Zhuo;Y. Ma;X. Yang;N. Zhao;M. Yu
中科院分区：
文献类型：
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作者：
W. Luo;H. Zhuo;Y. Ma;X. Yang;N. Zhao;M. Yu
采用蒙特卡罗方法研究了激光韦克菲尔德加速（LWFA）驱动的强康普顿散射γ射线辐射和超短正电子束的产生。利用LWFA驱动GeV电子束团，45飞秒、90 mJ/pulse、10 Hz的钛宝石激光驱动康普顿散射，产生fs γ射线脉冲。后者的通量≥10 8 /s，峰值亮度≥10 2 0 photons/（s mm 2 mrad 2 0.1%带宽），光子能量为5.9 ~ 2 3.2 MeV。γ射线脉冲然后撞击在薄的高Z靶上。在几个MeV的亚100 fs脉冲的形式，可以产生超过10 7正电子/s。这种超短正电子脉冲可以用作泵浦-探测型正电子湮没光谱以及在其他应用中。
Intense Compton-scattering γ-ray radiation driven by laser wakefield acceleration (LWFA) and generation of ultrashort positron beams are investigated by Monte Carlo simulation. Using an LWFA driven GeV electron bunch and a 45 femtosecond, 90 mJ/pulse, and 10 Hz Ti:Sapphire laser for driving the Compton scattering, fs γ-ray pulses were generated. The latter have a flux of ≥10 8 /s, peak brightness of ≥10 20 photons/(s mm 2 mrad 2 0.1% bandwidth), and photon energy of 5.9 to 23.2 MeV. The γ-ray pulses then impinge on a thin high- Z target. More than 10 7 positrons/s in the form of sub-100 fs pulses at several MeV can be produced. Such ultrashort positron pulses can be useful as the pump-probe type positron annihilation spectroscopy as well as in other applications.