Gyrokinetic Electron and Fully Kinetic Ion Particle Simulation of Collisionless Magnetic Reconnection

本研究继续研究了现实中有限引导场下二维和三维电流片的不稳定性，并进一步扩展和验证了磁重联过程的陀螺动力学电子和全动力学离子模型。磁重联是实验室和空间等离子体中的一个基本过程，被认为是托卡马克等离子体或大或小破坏的潜在物理机制。将回答以下具体的科学问题：(1)具有不同导场的电流片产生的不稳定性的线性特征模态结构和谱性质是什么？(2)非线性不稳定性的性质及其在电流片异常电阻率中的作用。在引导字段存在的情况下，如何在本地触发重新连接。(3)重联是如何演变的，在一个大系统（目前是二维系统）中，允许多个磁岛存在和相互作用的重联率是多少？准稳态重联结构的Riemann问题的基本解能否在不同尺寸和边界条件下得到？为本研究开发的创新和先进的模拟工具将在实验室等离子体中各种非线性波和波粒相互作用的模拟以及太阳耀斑和磁层输运的物理模拟中有更广泛的应用。由于磁重联是磁约束等离子体的基本过程之一，因此这项研究肯定会对聚变研究产生影响，在聚变研究中，由于低碰撞条件下电磁波动引起的输运过程的动力学分析是具有挑战性的问题之一。该提案已提交给NSF-DoE等离子体科学与工程合作项目联合招标08-589。该奖项由数学和物理科学理事会物理部和地球科学理事会大气科学部联合资助

This research continues investigation of 2-D and 3-D current sheet instabilities with a finite guide field, as in reality, and further extends and validates a gyrokinetic electon and fully kinetic ion model for the magnetic reconnection process. Magnetic reconnection is a fundamental process in laboratory as well space plasmas, attributed to be the underlying physical mechanism for major or minor disruptions of tokamak plasmas. The following specific science questions will be answered: (1) What are the linear eigenmode structure and spectral properties of instabilities generated in current sheet with various guide fields. (2) What are the properties of nonlinear instabilities and their roles in the anomalous resistivity in current sheet. How is the reconnection triggered locally in the presence of the guide field. (3) How does the reconnection evolve, and what is the reconnection rate in a large system, 2-D for now, that allows the presence of and interaction between multiple magnetic islands? Can the basic solutions of the Riemann problem, for structure of quasi-steady reconnection, be reached in system with various sizes and under various boundary conditions.The innovative and advanced simulation tools developed for this research will have a much broader application to simulations of various nonlinear waves and wave-particle interaction in laboratory plasmas and physics of solar flares and transport in the magnetosphere. Since magnetic reconnection is one of the fundamental processes in magnetically confined plasmas, this research will certainly have an impact on research of fusion interest, where kinetic analyses of transport processes due to electromagnetic fluctuations in low-collisionality conditions is one of the challenging problems.This proposal was submitted to the NSF-DoE Partnership in Plasma Science and Engineering joint solicitation 08-589. This award is being funded jointly by the Division of Physics of the Mathematical and Physical Sciences Directorate and by Atmospheric Sciences Division of the Geosciences Directorate