Fundamental Processes In Plasmas

等离子体的基本过程

• 批准号: 1707271
• 负责人: C. Fred Driscoll
• 金额: $ 1.5万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707271&HistoricalAwards=false
• 关键词: Fundamental; Processes; Plasmas

This award supports a program of theory and experiments to develop detailed understanding of waves and particle confinement in a plasma -- a gas of freely interacting electrically charged particles -- placed in a magnetic trap. The studies will characterize wave damping caused by individual particles bouncing end-to-end in the trap at different frequencies. The plasma transport and loss caused by internal magnetic irregularities will also be analyzed and measured. This research program has broad connections to fluid physics, atomic physics, anti-matter production, and fusion plasmas for power generation, and provides a stimulating environment for graduate and undergraduate student education.Experiments will be performed on two non-neutral plasma devices: the camera-diagnosed electron plasma apparatus "CamV" and on the laser-diagnosed Magnesium ion plasma apparatus "IV". Analytical theory and medium-scale simulation results will be directly compared to the experiments over a broad range of parameters. The goal is to identify limitations in the theory, and to stimulate new theory where needed. In particular, this research will elucidate the effects of internal potential variations, as bounce-harmonic Landau damping depends sensitively on the particle trajectories. Further, magnetic irregularities leading to topological separatrices are endemic to both quasi-neutral and non-neutral plasmas, and the novel "chaotic superbanana" transport to be studied here occurs even in nearly collisionless plasmas. This award to support an undergraduate student is made under the NSF/DOE Partnership in Basic Plasma Science and Engineering and is complementary to a DOE award made under the joint program.

该奖项支持一个理论和实验项目，以发展对等离子体（一种在磁阱中自由相互作用的带电粒子气体）中的波和粒子约束的详细理解。这些研究将描述由单个粒子在不同频率的阱中端到端弹跳引起的波阻尼。此外，还将分析和测量由内部磁不规则性引起的等离子体输运和损耗。本研究项目与流体物理、原子物理、反物质产生、聚变等离子体发电等领域有着广泛的联系，为研究生和本科生的教育提供了一个刺激的环境。实验将在两个非中性等离子体装置上进行：相机诊断电子等离子体装置“CamV”和激光诊断镁离子等离子体装置“IV”。分析理论和中等规模的模拟结果将直接与广泛参数范围内的实验进行比较。目标是找出理论的局限性，并在需要的地方激发新的理论。特别是，本研究将阐明内部势变化的影响，因为反弹谐波朗道阻尼敏感地依赖于粒子轨迹。此外，导致拓扑分离的磁不规则性在准中性和非中性等离子体中都是特有的，并且本文研究的新型“混沌超级香蕉”输运甚至发生在几乎无碰撞的等离子体中。该奖项是在美国国家科学基金会/美国能源部基础等离子科学与工程合作项目下设立的，是对美国能源部在联合项目下设立的奖项的补充。