激光辐射压加速中单能离子束和硬X射线产生机制研究

项目名称： 激光辐射压加速中单能离子束和硬X射线产生机制研究

项目编号： No.11205243

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学II

项目作者： 余同普

作者单位： 中国人民解放军国防科学技术大学

项目金额： 30万元

中文摘要： 针对近年来提出的激光辐射压离子加速问题，研究超强激光和超薄固体靶（纳米量级）相互作用时稳定的质子和重离子加速机制和相关细致物理过程；探究抑制横向不稳定性的技术方案并有效提高激光能量转化效率；改善辐射压加速产生的质子和重离子的束流特性如能散、峰值能量和束发散度；开发电子同步辐射程序包计算近似条件下激光固体靶相互作用时的电子同步辐射并讨论其对离子加速过程的影响；分析电子的动力学行为，研究辐射压加速中硬X射线-伽马射线的产生机制及其物理特性如发散角、辐射强度、辐射功率等，为新型fs级辐射源提供技术方案和理论参考。

中文关键词： 类betatron辐射；同步辐射；超强激光；辐射压加速；离子加速

英文摘要： Laser radiation pressure driven proton/ion acceleration has attracted a lot of attention these years. We study the detailed acceleration mechanism and process of stable ion acceleration in this regime. To further enhance the laser-to-ion energy conversion efficency and improve the beam quality such as the energy spread, ion peak energy, and beam divergency, we try to pursue a new solution to overcome transverse instabilities during the laser-solid foil interaction. Considering the synchrontron radiation in the particle-in-cell code, we develop a special module to calculate the electron synchrotron radiation during the laser-foil interaction and discuss its effects on the ion acceleration. The electron dynamic behavior is analysised and the radiation parameters such as the emission angle, radition intensity, and radiation power are carefully evaluated which may benefit the research on the noval fs-class ultra-bright light source in the future.

英文关键词： betatronlike radiation；synchrotron radiation；ultraintense laser；radiation pressure acceleration；ion acceration