HL-2A 等离子体位形重建研究

采用了新的放电方案，消除了环向场对磁测量的影响。通过修改信号调理电路，解决了积分器不能响应磁通快速变化的问题；通过改进磁测量的标定方法，在准确标定磁通和极向磁探针测量的同时，有效地标定了径向磁探针的测量信号。输入这些有效标定数据后，EFIT 能快速收敛，获得了准确可靠的位形重建结果，与探针、氢阿尔法和CCD 等诊断结果很好符合。同时介绍了自行研制的sFIT 位形重建代码，该代码得到的位形重建结果，与EFIT 反演结果一致。

Plasma equilibrium reconstruction of HL-2A tokamak

The measuring accuracy of magnetic probes is greatly improved by eliminating the disturbance of TF coils through a new discharge scenario, together with a careful calibration process. The measuring accuracy of flux loop is also improved by removing the clamping diodes in integrator which cause the loss of fast information. With accurate magnetic field and flux information input, the iteration and fitting process of EFIT converges quickly and outputs reliable results, which are consistent with diagnostic results achieved by Langmuir probes, Hα array and CCD image. A new self-developed plasma equilibrium reconstruction code, called sFIT, is also introduced, which outputs the plasma shape information that agrees very well with that of EFIT.