HL-2A单零偏滤器的位形特征

利用积分方法对多种电流剖面下HL2A装置单零偏滤器位形特征进行了计算研究。积分方法的优点是可以在任意电流剖面下求解具有X-点的自由边界的Grad-Shafranov方程。对HL2A装置而言，大体上可以在合理设定的分界面形状下，经几次叠代计算出各组极向场线圈(垂直场，三对多极场和多极补偿场以及水平场)中的电流。HL-2A的单零偏滤器位形基本上是圆截面加上在X-点附近的局部形变。对刮离区和偏滤器靶板区磁力线特性进行了分析以确定偏滤器的品质。

Characteristics of the single null divertor of the HL-2A tokamak

Characteristics of the single-null divertor configuration of the HL-2A tokamak are studied by using the integral approach for various current profiles. The advantage of this approach is its suitability for solving the free boundary Grad-Shafranov equation with X-points for arbitrary current profile. For the HL-2A tokamak, the required disposal of the currents in different poloidal coils (the vertical field coils, the three multi-polar coils, the compensated multi-polar coils and the horizontal coils) can be appropriately determined through a few iterations under a reasonable initial assumption about the plasma boundary. The boundary of the single-null diverted plasma in the HL-2A tokamak is simply a circular one plus a local triangular deformation near the X-point. The merit of this divertor configuration is studied by following several magnetic field lines in the scrape-off layer.