由激光加速电子驱动的具有高峰通量的准直伽马光束

IF 5.2 1区 物理与天体物理 Q1 OPTICS High Power Laser Science and Engineering Pub Date : 2023-03-21 DOI:10.1017/hpl.2023.25
L. Fan, Tongjun Xu, Shun Li, Zhangli Xu, Jiancai Xu, Jianqiang Zhu, B. Shen, L. Ji
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引用次数: 0

摘要

摘要激光加速电子在研究核光子学、获得丰富的正电子和探索真空中光子-光子相互作用方面具有很高的应用前景。我们报道了基于皮秒激光加速电子的高光子产率和低发散的辉煌伽玛射线束的实验产生。120j1ps的激光脉冲在高密度气体射流中驱动自调制尾流场加速,产生26 nC的数十mev电子,散度小至$1.51{}^{\circ}$。这些准直电子在穿越高z固体目标时通过轫致辐射产生伽马射线光子。我们设计了一个高能量分辨率的康普顿散射光谱仪,发现光子能量高达$16\;\ mathm {MeV}$时,在$1.1{}^{\circ}$的接受角范围内,捕获的总光子数为$2.2\乘以{10}^9$。实验结果与Monte Carlo模拟结果的比较表明,光子束继承了电子的小散度,对应于总光子数为$2.2\乘以{10}^{11}$,散度为$7.73{}^{\circ}$。
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Collimated gamma beams with high peak flux driven by laser-accelerated electrons
Abstract Laser-accelerated electrons are promising in producing gamma-photon beams of high peak flux for the study of nuclear photonics, obtaining copious positrons and exploring photon–photon interaction in vacuum. We report on the experimental generation of brilliant gamma-ray beams with not only high photon yield but also low divergence, based on picosecond laser-accelerated electrons. The 120 J 1 ps laser pulse drives self-modulated wakefield acceleration in a high-density gas jet and generates tens-of-MeV electrons with 26 nC and divergence as small as $1.51{}^{\circ}$ . These collimated electrons produce gamma-ray photons through bremsstrahlung radiation when transversing a high-Z solid target. We design a high-energy-resolution Compton-scattering spectrometer and find that a total photon number of $2.2\times {10}^9$ is captured within an acceptance angle of $1.1{}^{\circ}$ for photon energies up to $16\;\mathrm{MeV}$ . Comparison between the experimental results and Monte Carlo simulations illustrates that the photon beam inherits the small divergence from electrons, corresponding to a total photon number of $2.2\times {10}^{11}$ and a divergence of $7.73{}^{\circ}$ .
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来源期刊
High Power Laser Science and Engineering
High Power Laser Science and Engineering Physics and Astronomy-Nuclear and High Energy Physics
CiteScore
7.10
自引率
4.20%
发文量
401
审稿时长
21 weeks
期刊介绍: High Power Laser Science and Engineering (HPLaser) is an international, peer-reviewed open access journal which focuses on all aspects of high power laser science and engineering. HPLaser publishes research that seeks to uncover the underlying science and engineering in the fields of high energy density physics, high power lasers, advanced laser technology and applications and laser components. Topics covered include laser-plasma interaction, ultra-intense ultra-short pulse laser interaction with matter, attosecond physics, laser design, modelling and optimization, laser amplifiers, nonlinear optics, laser engineering, optical materials, optical devices, fiber lasers, diode-pumped solid state lasers and excimer lasers.
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