Theory and Simulation of Nonlinear Phenomena in Laboratory and Astrophysical Plasmas

实验室和天体物理等离子体中非线性现象的理论与模拟

• 批准号: 11695028
• 负责人: SAKAI Jun-ichi
• 金额: $ 4.42万
• 依托单位: Toyama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11695028/
• 关键词: Cosmic Plasma; Magnetic Reconnection; Laser-Plasma; Corona Heating; Ion Acceleration; 高エネルギー粒子加速

1. Magnetic Reconnection in Cosmic PlasmasWe investigated the process of collision-less magnetic reconnection in force-free configuration of pair plasmas by using 2-dimensional particle-in-cell code. We found a very effective energy converion process where about 50% of magnetic field energy can be converted to plasma heating.2. Laser-plasma InteractionWe investigated the relaxation process of relativistic electron beam with return current in plasma, by using 2- and 3-dimensional particle-in-cell code. We found that the system becomes unstable against fomentation instability, leading to formation of many small-scale current filaments. In the nonlinear stage of the successive coalescence of small-scale filaments there occurs strong ion acceleration. We found the physical mechanism of the strong ion acceleration.3. Mechanism of coronal loop footpointsRecent observations showed that the coronal loop footpoints are locally heated. We investigated the mechanism of the coronal loop footpoints by proposing several possible new mechanisms.

1. 宇宙等离子体中的磁重联利用二维细胞内粒子编码研究了对等离子体无力构型中无碰撞磁重联的过程。我们发现了一个非常有效的能量转换过程，其中约50%的磁场能量可以转换为等离子体加热。激光与等离子体相互作用本文利用二维和三维的细胞内粒子编码研究了等离子体中具有回流的相对论电子束的弛豫过程。我们发现系统在形成不稳定时变得不稳定，导致许多小尺寸电流细丝的形成。在小尺度细丝连续聚并的非线性阶段，发生了强烈的离子加速。我们发现了强离子加速的物理机制。日冕环足点的机制最近的观测表明，日冕环足点是局部加热的。我们通过提出几种可能的新机制来研究日冕环足点的机制。

项目成果

N.A.Bobrva et al.: "Force-free Egulibria and Reconnection of the Magnetic Field Lines in Collision-less Plasma Configurations"Physics of Plasmas. 8. 759-768 (2001)

N.A.Bobrva 等人：“无力均衡和无碰撞等离子体配置中磁场线的重新连接”等离子体物理学。

N.F. Cramer, J.I. Sakai and S.V. Vladimirov: "Nonlinear Alfven Waves in Weakly Ionised Dusty Plasmas"Publications of the Astronomical Society of Australia. 18. 374-383 (2001)

N.F.

A. Esaulov, P. sasorov, L. Soto, M. Zambra and J. I. Sakai: "MHD simulation of a fast hollow cathode capillary discharge"Plasma Physics and Controlled Fusion. 43. 571-588 (2001)

A. Esaulov、P. sasorov、L. Soto、M. Zambra 和 J. I. Sakai：“快速空心阴极毛细管放电的 MHD 模拟”等离子体物理和受控聚变。

J.I. Sakai and K. Furusawa: "Nonuniform Heating of Coronal Loop Footpoints and Formation of Loop Threads associated with Up- and Down-flows in the Solar Chromosphere"The Astrophysical Journal. vol. 564. 1048-1053 (2002)

J.I.

IV Sokolov & J.I Sakai: "Magnetohydsodynamics of a Weakly Ionized Plosma : Ambipolas Magnetic Diffusion and Shock Structure"Plasma Physics Reports. 26. 439-501 (2000)

四世索科洛夫