HL-2A装置大拉长比和三角形变等离子体位形设计

Design of plasma configuration with high elongation and triangularity for HL-2A tokamak

介绍了基于MATLAB程序自主开发的等离子体位形编辑和设计代码SE,包括其设计原理、主要功能、人机界面和操作步骤。通过SWEQU代码对SE代码的准确性进行了有效验证,分别用上述两种代码设计和验证了两种具有中等拉长比和三角形变位形的放电参数。具有较高拉长比和三角形变位形的实现需要投入装置的上偏滤器线圈来突破圆形截面的限制。最后通过SE代码编辑了一个较大拉长比和三角形变的等离子体位形,并获得了相应的放电参数。结果表明,在HL-2A装置投入上偏滤器线圈后,可以得到具有较大拉长比和三角形变的新等离子体位形,这些位形为提高HL-2A等离子体的品质奠定了坚实的基础。

A code named SE which is based on MATLAB language for editing and designing plasma shape is introduced, with its design principle, main function, operation interface and operation steps. The correctness of SE is proved effectively with traditional code SWEQU. Furthermore, these two codes are used to design and confirm the discharge parameters of two plasma shapes with medium elongation and triangularity. In order to achieve shapes with higher elongation and triangularity, the limit of circular cross section must be broken by using upper divertor coils. Finally, a plasma shape with higher elongation and triangularity is designed and its discharge parameters are provided with SE code. The design results demonstrate that with upper divertor coils energized, new plasma shapes with higher elongation and triangularity can obtained on HL-2A tokamak. These new plasma shapes lay solid foundation for improving the plasma quality on HL-2A tokamak.