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年美国复苏和再投资法案（公法111-5）资助的。该提案涉及对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性和动力学的实验研究。在此之前，对高达0.7千兆高斯的磁场进行了原理验证测量，这些磁场是在超相对论入射激光强度下产生的，其中激光场中的电子振荡速度大于光速（这比实验室中其他先前的磁场测量大约100倍）。目前的研究计划是将这些测量扩展到1000倍以上的强度，并通过开发独特的时间分辨探测诊断，使用a）单能量相对论电子束和B）高阶XUV谐波发射，以获得在这些极端条件下等离子体行为的清晰物理理解。这些实验中使用的超高强度将使用密歇根大学超快光学科学中心（CUOS）的500 TW Hercules激光系统。该激光系统是NSF物理前沿中心（FOCUS）的一部分。拟议工作的结果将刺激在这些相互作用中的磁场产生和演化的理论理解的进展。这样的理解不仅对于改进相对论等离子体动力学的基本理解至关重要，（在实验室和天体物理学情况下），但也需要这些激光束的几乎所有建议的应用，如快速点火聚变，医学放射治疗以及紧凑型X射线和高能粒子源的发展。该提案已提交给NSF-能源部等离子体科学与工程合作伙伴联合征集。该奖项由物理学系等离子体物理学项目资助。