边界偏压对撕裂模控制机制的研究

撕裂模等磁流体（MHD）不稳定性会降低磁约束聚变装置的约束水平，如何控制MHD不稳定性一直是磁约束聚变研究的重要课题之一。最近J-TEXT托卡马克上观察到边界偏压可以影响甚至完全抑制撕裂模，该结果表明边界偏压可作为一种控制撕裂模行为的有效手段，然而迄今为止，对偏压影响撕裂模的物理机制并不清楚，本项目拟在J-TEXT装置偏压影响撕裂模实验基础上进一步研究其物理机制，研究内容包括：1.分析等离子体流反常粘滞时间，并与撕裂模对偏压的响应时间对比；2.系统研究偏压作用下流剪切和撕裂模的时空演化，探索流剪切在偏压控制撕裂模过程中的作用；3.分析并比较极向和环向流剪切对撕裂模的影响，以及二者与偏压影响撕裂模的时空尺度之间的关联。通过该项目的实施，探索并深入理解偏压对撕裂模影响的时空过程及物理机制，从而达到通过边界偏压有效控制撕裂模的目的。

The Magnetohydrodynamic (MHD) instabilities, such as tearing mode, can lead to the reduction of the constraint level of a magnetic confinement fusion device. How to control them is a key issue for the magnetic confinement fusion research. Recently, it is observed on J-TEXT tokamak that edge bias-voltage can make influences on the tearing mode (TM) and even suppress it. It indicates that the edge bias-voltage can be used as a method to control the TM. However, the physics mechanism of the edge bias-voltage impacting the TM is still unclear. In this project, we will develop related experimental research based on the biasing experiments of J-TEXT device to investigate the physics mechanisms. The main contents are: 1. Analyse the abnormal viscous time of plasma flow and compare with the TM response time to the edge bias-voltage. 2. Research the temporal-spatial evolution of flow shears and TM with the bias-voltages and explore the function of flow shear in the bias-voltage controlling TM process; 3. Analyse and compare the effects of poloidal and toroidal flow shear on the TM and the temporal- spatial scale relationship between the shears and the TM. Through the implementation of this project, it is expected to understand the mechanisms of the edge biasing-voltage on the TM and achieve the purpose of effective controlling TM by the edge bias-voltage.