Four-dimensional (spatial and temporal) investigation of hard x-ray emission produced by intense femtosecond laser interactions with solid targets

对飞秒激光与固体目标强烈相互作用产生的硬 X 射线发射的四维（空间和时间）研究

• 批准号: 26579214
• 负责人: Professor Dr. Paul Gibbon
• 金额: --
• 依托单位: Department of Mathematics
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26579214?language=en
• 关键词: Four; dimensional; spatial; temporal; investigation

A research program is proposed aimed at resolving a number of important but poorly understood issues in hard x-ray emission from short-pulse, high-intensity laser interactions with solid targets. Particular attention will be given to the role of fast electron transport in and around the target material, which largely determines the spatial and temporal source characteristics of both K¿ and bremsstrahlung x-ray emission. For this purpose, a recently developed three-dimensional, mesh-free model will be used which is capable of handling laser interactions with geometrically complex targets with finite resistivity, a task which is currently beyond the reach of conventional kinetic simulation tools. This theoretical investigation will be performed in tandem with experiments specifically designed to probe anomalous transport behaviour via K¿ emission measurements. If successful, the project will lead to better physical understanding of femtosecond x-ray generation at high laser intensities and provide urgently needed guidance for increasing K¿ source efficiency. As such, the results of this study will have a direct impact on many of the other projects within the Schwerpunktprogramm which depend on high Ka photon flux for diffractometry and spectroscopy applications.

提出了一项研究计划，旨在解决短脉冲、高强度激光与固体靶相互作用产生的硬X射线发射中的一些重要但鲜为人知的问题。将特别注意目标材料内部和周围的快速电子传输的作用，这在很大程度上决定了K？和韧致辐射X射线发射的空间和时间源特征。为此，将使用最近开发的三维无网格模型，该模型能够处理激光与具有有限电阻率的几何复杂目标的相互作用，这一任务目前超出了传统动力学模拟工具的能力范围。这一理论研究将与专门设计的通过K？发射测量来探测异常输运行为的实验同步进行。如果成功，该项目将导致对在高激光强度下产生飞秒X射线的更好的物理理解，并为提高钾源效率提供迫切需要的指导。因此，这项研究的结果将对施沃朋克计划中的许多其他项目产生直接影响，这些项目依赖于用于衍射术和光谱分析应用的高Ka光子通量。