磁螺度(helicity)注入电流驱动实验的平衡反演

磁螺度注入是一种国际上正处于探索性研究阶段的极富吸收力的电汉驱动方案，尤其对于球环堆芯更具有至和关重要的意义。对磁螺度注入电流驱动实验进行平衡反演工作，将实验数据进行理论分析研究，拟合所有的测量数据以确立实际的等离子体位形，平衡的磁拓扑结构以及环向电流的空间分布，从而确定闭合橛面区的驱动电流大小以及等离子体的性质，计算结果表明等离子体具有托卡马克型ｑ分布，环向电汉分布呈中空形，磁面结构为有三角形变

EQUILIBRIUM RECONSTRUCTION OF HELICITY INJECTION URRENT DRIVE EXPERIMENT

Current drive is one of the major issues in controlled nuclear fusion research field. For the steady state operation, a variety of curren t drive methods are under systematic investigation. Helicity injection current drive is an attractive method. The experiment on Helicity Injected Tokamak(HIT) in U.S. obtained 150 kA toroidal driven current applying the coaxial helicity in jection, which is the most remarkable results. This paper reports the results  about equilibrium reconstruction in the above mentioned experiment. The driven current profiles and magnetic topo logy are consistent with the MHD equlibr ium constraint from magnetic measurement data by using EFIT equilibrium fitting code. The reconstruction shows that these plasmas have a Tokamak q profile, with a hollow toroidal current profile and up to 110 kA of closed field toroidal current in a low aspect ratio configuration. Calculation results also indicate that plasma relaxed state is a non complete relaxation state away from Taylor State.