Axial Plasma Jets and their Interaction with and Production of Alfvén Waves

轴向等离子射流及其与阿尔文波的相互作用和产生

• 批准号: 0904041
• 负责人: Stephen Vincena
• 金额: $ 1.5万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0904041&HistoricalAwards=false
• 关键词: Axial; Plasma; Jets; their; Interaction

This award is made in response to a proposal submitted to and reviewed under the NSF/DoE Partnership in Basic Plasma Science and Engineering joint solicitation NSF 08-589. The award provides funds to support travel for a graduate student to scientific conferences and for undergraduate participation in the overall research effort, which is being funded separately by the DoE under contract to UCLA (Science report #09ER55061)This research will use UCLA's unique LAPD facility and its laser plasma capability to do experiments on the coupling of mass, energy, and momentum from a localized, dense, and rapidly expanding plasmas into a large-scale magnetized background plasma. Using the laser we will generate field-aligned plasma flows that can be varied from supersonic to super Alfvénic. The research program is divided into three main topics: 1) the coupling of plasma jets to compressional Alfvén waves, 2) the creation of wakes and structure with supersonic flows, and 3) the interaction of Alfvén waves with fast-flowing plasmas. The experiments will be complemented by computer simulations using a state-of-the-art PIC code developed at UCLA. The code is capable of resolving skin depth structures as well as tracking Alfvénic phenomena. The nonlinear interaction of Alfvén waves with moving plasmas has been the subject of theoretical studies but has never been probed in laboratory experiments. This study is of relevance to phenomena in the Earth's magnetotail, coronal plume expansion within low beta coronal holes, and could be of relevance to astrophysical jets. The NSF support of undergraduate participation adds a broader educational impact through the early-year training of students by introducing them to scientific research as a possible career path.

该裁决是针对基本等离子科学与工程联合招标NSF 08-589的NSF/DOE合作伙伴关系提交和审查的提案。该奖项提供资金，以支持研究生前往科学会议和本科生参与整体研究工作的旅行，该研究由与UCLA合同下的DOE分别资助（科学报告＃09ER55061），这项研究将使用UCLA独特的LAPD设施及其在Mass and Mass and Mass and a a Mass and a a cou andply and a cou y and a cou y and a a cou y gropliment and a a cou y and a cou y and a cou y groplim and a a cou y gropliment and a a cou y gropping and and and的速度，并迅速发展。将平原大小扩展到大型磁化背景等离子体中。使用激光器，我们将产生与场对齐的等离子体流，这些流动流可以从超音速到超级alfvénic变化。研究计划分为三个主要主题：1）等离子体喷气器与压缩alfvén波的耦合，2）用超音速流的唤醒和结构的创建，以及3）Alfvén波与快速流动的平原的相互作用。实验将通过计算机模拟使用UCLA开发的最新图片代码完成。该代码能够解决皮肤深度结构以及跟踪Alfvénic现象。 Alfvén波与移动平原的非线性相互作用一直是理论研究的主题，但在实验室实验中从未得到证明。这项研究与地球磁尾的现象，低β冠状孔内的冠状李子扩张相关，并且可能与天体物理喷气机相关。 NSF对本科参与的支持通过向学生介绍科学研究作为可能的职业道路，通过对学生的早期培训增加了更广泛的教育影响。