Dusty plasmas with high electron depletion:Investigation of fundamental mechanisms and properties through particle and plasma diagnostics

具有高电子损耗的尘埃等离子体：通过粒子和等离子体诊断研究基本机制和特性

• 批准号: 418187010
• 负责人: Privatdozent Dr. Franko Greiner
• 金额: --
• 依托单位: Institut für Theoretische Physik und Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/418187010?language=en
• 关键词: Dusty; plasmas; electron; depletion; Investigation

This project is dedicated to the investigation of a nanodusty plasma with a particle number density that is sufficiently high to significantly affect the properties of the whole plasma. Due to the high negative charging of the particles, electrons are strongly depleted and the plasma changes its state from a three-component dust-ion-electron plasma to a two-component dust-ion plasma. The charging of the nanoparticles in the plasma is the key property – a comprehensive understanding of the processes involved is essential for both fundamental plasma physics research and plasma technology. The Havnes parameter P provides a measure for the degree of electron depletion between P = 0 (no depletion) and P → ∞ (complete electron depletion). In this project we will• Create nanodusty laboratory plasmas with very high Havnes-Parameter ( P > 100)• Characterize these plasmas using the dust-density wave diagnostics• Develop in-situ diagnostics of the nanoparticle size and density profile by means of light scattering techniques for both optically thin and thick clouds• Verify the in-situ diagnostics by ex-situ microscopy, and• Develop new light scattering diagnostics for technical applicationsFor the first time, laboratory plasmas with a high Havnes parameter will be characterized in depth. The new insight into the growth of nanoparticles and the knowledge about the mechanisms of growth and confinement of nanoparticles in a plasma will be of importance for both basic plasma physics and future plasma technological applications.

本项目致力于研究纳米尘埃等离子体，其粒子数密度足够高，足以显著影响整个等离子体的特性。由于粒子的高负电荷，电子被强烈耗尽，等离子体从三组分尘埃-电子等离子体变为双组分尘埃-离子等离子体。等离子体中纳米粒子的充电是关键特性——对相关过程的全面理解对于基础等离子体物理研究和等离子体技术都是必不可少的。哈夫内斯参数P提供了在P = 0（无耗尽）和P→∞（完全电子耗尽）之间的电子耗尽程度的度量。在这个项目中，我们将•创建具有非常高哈夫斯参数（P > 100）的纳米尘埃实验室等离子体•使用尘埃密度波诊断来表征这些等离子体•通过光散射技术对光学薄云和厚云进行纳米颗粒尺寸和密度分布的原位诊断开发•通过非原位显微镜验证原位诊断，以及•为技术应用开发新的光散射诊断。具有高哈夫纳参数的实验室等离子体将被深入表征。对纳米颗粒生长的新认识以及对等离子体中纳米颗粒生长和约束机制的认识将对基础等离子体物理学和未来等离子体技术应用具有重要意义。