Femtosecond Probing of Magnetic Fields Generated from Ultra-Intense Laser Plasma Interactions

超强激光等离子体相互作用产生的磁场的飞秒探测

• 批准号: 0810979
• 负责人: Karl Krushelnick
• 金额: $ 65万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0810979&HistoricalAwards=false
• 关键词: Femtosecond; Probing; Magnetic; Fields; Generated

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This proposal involves an experimental investigation into the characteristics and dynamics of the huge magnetic fields generated during high intensity laser interactions with solid density plasmas. Previously, proof-of-principle measurements of magnetic fields up to 0.7 Gigagauss were done which were generated at ultra-relativistic incident laser intensities where the electron oscillation velocity in the laser field is larger than the speed of light (this was about 100 times greater than other previous measurements of magnetic fields in the laboratory). The present research plan is to extend these measurements to intensities 1000 times larger and also to obtain a clear physical understanding of the behavior of plasma in these extreme conditions by developing unique time-resolved probing diagnostics using both a) mono-energetic relativistic electron beams and b) high order XUV harmonic emission. The ultra-high intensities to be used in these experiments will be made possible using the 500 TW Hercules laser system at the Center for Ultrafast Optical Science (CUOS) at the University of Michigan. This laser system has been constructed as part of an NSF Physics Frontier Center (FOCUS). The results of the proposed work will stimulate progress in the theoretical understanding of magnetic field generation and evolution in these interactions. Such understanding is critical not only for an improved fundamental understanding of the dynamics of relativistic plasma (both in the laboratory and in astrophysical situations) but is also required for almost all of the proposed applications of these laser beams such as fast ignition fusion, medical radio-therapy as well as for the development of compact x-ray and energetic particle sources.This proposal was submitted to the NSF-DoE Partnership in Plasma Science and Engineering joint solicitation. This award is being funded by the Plasma Physics Program in the Division of Physics.

该奖项是根据2009年的《美国回收与再投资法》（公法111-5）资助的。该提案涉及对在高强度激光与固体密度等离子体相互作用期间产生的巨大磁场的特征和动力学的实验研究。以前，对高达0.7吉加斯的磁场的原则测量结果是在超偏好的事件激光强度下产生的，在激光场中的电子振荡速度大于光速（这是光速的大于光速（这是实验室中其他磁场的其他磁场测量值的大约100倍））。本研究计划是将这些测量值扩展到更大的1000倍的强度，并通过使用A）单能单能相对性电子束和B）高阶XUV XUV harmonic发射来对这些极端条件下血浆的行为有清晰的物理理解。使用密歇根大学超快光学科学中心（CUOS）的500 TW Hercules激光系统，将使这些实验中使用的超高强度成为可能。该激光系统已被构建为NSF物理边界中心（Focus）的一部分。拟议的工作的结果将刺激这些相互作用中磁场产生和进化的理论理解的进步。这种理解不仅对于对相对论血浆动态的基本理解（在实验室和天体物理情况下）的动态至关重要，而且对于这些激光光束的几乎所有提议的应用，例如快速点火融合（例如，医疗放射），医疗式和能量粒子的发展也是如此，这也是必不可少的。工程联合招标。该奖项是由物理学部的血浆物理计划资助的。