| Cite this article as: 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.(原子与分子物理学报), 2023, 40: 013001 (in Chinese) |
| The Interaction of Hot Electrons and Target in Femtosecond Laser-Driven X-ray Source |
| Hits 551 Download times 122 Received:March 02, 2022 Revised:March 14, 2022 |
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| Key Words
Ultrashort ultraintense Laser X-ray Monte Carlo simulation Hot electron Electron-Atom Scattering |
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| Abstract
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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. |
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