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Abstract

All-laser-driven Thomson scattering based on laser wakefield acceleration can provide high quality X-ray and greatly reduce the source size. Compared with two-pulse setting, the self-reflecting setting can reduce the requirement for temporal and spatial synchronization in experiment. However, it is difficult to optimize X-ray because Thomson scattering is coupled with laser wakefield acceleration in this process. In this paper, we correct theory formula through numerical simulation, and analyze the parameters quantitatively in laser wakefield acceleration and Thomson scattering, such as spot size, duration and energy of laser and electron beam, and reflectivity of plasma mirror. Then we can trace the parameters by using the modified formula rather than the numerical simulation with similar accuracy and less time. The modified formula is also used to optimize the self-reflecting all-laser-driven Thomson scattering X-ray under the given laser conditions. The optimal X-ray luminance and photon number can be obtained by changing the plasma density and the position of the plasma mirror.

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Corresponding author:Gu Yu-Qiu,yqgu@caep.cn

Funds:Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0401100) and the Science Challenge Project, China (Grant No. TZ2018005)

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方法	经过LWFA的激光			电子束			X射线
方法	焦斑/μm	脉宽/fs	能量损失/(%·mm^–1)	能量/MeV	焦斑/μm	发散角/mrad	光子数/10⁷	亮度/(10¹⁸photons·s^–1· mm^–2·mrad^–2· (0.1%BW)^–1)
修正公式	10	7	17	460	2.0	18	4.1	1.3
数值模拟	10	6	17	450	1.8	16	4.0	1.6

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Vol. 70, Issue 8 - 2021-04-20

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