Ultrashort-pulse MeV positron beam generation from intense Compton-scattering γ-ray source driven by laser wakefield acceleration

被引：15
|
作者：
Luo, W. [1 ,2 ]
Zhuo, H. B. [2 ,3 ]
Ma, Y. Y. [2 ,3 ]
Yang, X. H. [2 ]
Zhao, N. [2 ]
Yu, M. Y. [4 ,5 ]
机构：
[1] Natl Univ Def Technol, Coll Sci, Changsha 410073, Hunan, Peoples R China
[2] Univ South China, Coll Nucl Sci & Technol, Hengyang, Peoples R China
[3] China Acad Engn Phys, Laser Fus Res Ctr, Mianyang, Peoples R China
[4] Zhejiang Univ, Dept Phys, Inst Fus Theory & Simulat, Hangzhou 310003, Zhejiang, Peoples R China
[5] Ruhr Univ Bochum, Bochum, Germany
来源：
LASER AND PARTICLE BEAMS | 2013年 / 31卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Compton scattering; Femtosecond gamma-ray pulse; Laser wakefield acceleration; Positron beam; Ultrashort; ELECTRON-BEAMS; PLASMA; ANNIHILATION; FEMTOSECOND;
D O I：
10.1017/S0263034612000948
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Intense Compton-scattering gamma-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 gamma-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 gamma-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.
引用
收藏
页码：89 / 94
页数：6
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