撕裂模不稳定性无论在空间等离子体中还是实验室等离子体中都是一种非常重要的物理过程。由于电子和离子运动解耦所导致的Hall 效应可能导致撕裂模不稳定性快速发展和模扰动结构的旋转而变得不可忽视。目前国际上没有大型的Tokamak模拟程序模拟考虑撕裂模不稳定性研究报告，而我们自主研发的高精度非线性三维磁流体力学数值模拟程序（CLT）能够模拟研究考虑Hall效应的托卡马克中撕裂模不稳定性过程。我们将在此基金项目资助下深入研究Tokamak中的撕裂模不稳定性和sawtooth过程中的快速crash现象。探讨撕裂模不稳定性与内部输运壁垒之间的关系，研究外加驱动电流和三维磁场扰动对撕裂模不稳定性发展的作用机理，获得控制撕裂模不稳定性的最佳驱动电流和三维磁场扰动形式，为正在开展的及未来需要开展的相关实验研究提供理论支持。

Tearing mode instability is one of the most important dynamic processes in space and laboratory plasmas. Hall effects, resulted from the decoupling of electron and ion motions, could cause the fast development and perturbation structure rotation of the tearing mode and become non-negligible. In magnetic confined fusion community, there has no formal report that any present large scale MHD code can investigate tearing mode instabilities with self-consistent inclusion of Hall effects. We independently developed high accuracy nonlinear MHD code (CLT) to study Hall effects on the dynamic evolution of tearing modes with Tokamak geometries. With support of NSF fund, we will carefully study tearing mode instability and fast crash of sawtooth using CLT. We try to understand and explore the relation between the formation of the internal transport barrier and development of tearing mode instabilities. The suppressing mechanisms of external driven current and three dimensional magnetic field perturbations on tearing mode instabilities are also investigated, which might give a guidance how to choose optimal external driven currents and perturbations of magnetic fields to control tearing mode instabilities in experimental researches.