| 引用本文格式: Yu Lin,Zhao Hong-Ming,Qin Xiu-Bo,cao qiang. The Interaction of Hot Electrons and Target in Femtosecond Laser-Driven X-ray Source [J]. J. At. Mol. Phys., 2023, 40(1): 013001 (in Chinese) [俞林,赵宏鸣,秦秀波,曹强. 飞秒激光驱动X射线源中超热电子与靶相互作用研究 [J]. 原子与分子物理学报, 2023, 40(1): 013001] |
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| 飞秒激光驱动X射线源中超热电子与靶相互作用研究 |
| The Interaction of Hot Electrons and Target in Femtosecond Laser-Driven X-ray Source |
| 摘要点击 550 全文点击 122 投稿时间：2022-03-02 修订日期：2022-03-14 |
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| DOI编号
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| 中文关键词
超短超强激光 X射线 蒙特卡洛模拟 超热电子 电子-原子散射 |
| 英文关键词
Ultrashort ultraintense Laser X-ray Monte Carlo simulation Hot electron Electron-Atom Scattering |
| 基金项目
中国科学院战略性先导科技专项，国家自然科学基金 |
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| 中文摘要
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| 飞秒激光与靶相互作用产生超热电子，随后超热电子与靶原子碰撞，通过kα、kβ等散射过程，可辐射高亮度、飞秒级X射线，在原子与分子物理、生物及医学等领域均有广泛的应用前景。论文首先对飞秒激光驱动X射线源的发展进行简要叙述，然后对X射线源中的超热电子与靶相互作用进行研究。超热电子的产生由靶材对光脉冲的非碰撞吸收机制决定，X射线的产生由超热电子决定。研究超热电子、靶参数对X射线产额的影响，确定最佳参数值，可指导驱动激光脉冲参数的选择，以获得更大的X射线光子产额。使用蒙特卡洛模拟方法可研究超热电子动能及入射角、靶材（Cu靶）厚度对靶材上、下表面X射线辐射光子产额的影响，分析确定最佳超热电子动能及最佳靶厚。驱动激光强度与超热电子动能的定标关系表明：需要合理选择驱动激光参数，使真空加热机制主导超热电子产生过程，以在合适的激光脉冲强度下获得最大X射线光子产额。 |
| 英文摘要
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| The femtosecond laser interacts with the target to generate hot electrons, then the hot electrons collide with the target atoms, through kα、kβ and other scattering processes, high-brightness, femtosecond X-rays can be radiated. It has broad application prospects in atomic and molecular physics, biology, medicine and other fields. This paper first briefly describes the development of the femtosecond laser-driven X-ray source, and then studies the interaction of hot electrons with the target. The generation of hot electrons is determined by the non-collision absorption mechanism of the target, and the generation of X-ray is determined by the hot electrons. The study of the effects of thermal electrons and target parameters on X-ray yield and determination of the optimal parameter values can guide the selection of drive pulse parameters to obtain greater X-ray photon yield. Monte-Carlo simulations are used to study the effects of kinetic energy and incident angle of the hot electrons, and the thickness of the target (Cu target) on the X-ray photon yield on the upper and lower surfaces of the target. The optimal hot electron kinetic energy and target thickness are determined. The scaling law between the intensity of the drive pulse and the kinetic energy of hot electrons shows that the parameters of the drive pulse need to be reasonably selected so that the vacuum heating mechanism dominates the generation process of hot electrons to obtain the maximum X-ray photon yield under appropriate laser pulse intensity. |
