EAST位形磁流体平衡的模拟

A Simulation of the EAST MHD Equilibrium Configuration

对托卡马克平衡反演数值计算代码EFIT进行了改进,使之适用于EAST装置的磁流体平衡研究.用改进后的平衡反演代码EFIT模拟了EAST装置稳态阶段的偏滤器平衡位形.提出极向场线圈电流作为线性方程组主约束条件,期望位形作为从约束条件,求解非对称电流条件下自由边界平衡问题的方法.结果表明,该方法能较为容易地得到非对称电流条件产生的平衡位形,在非对称电流条件下自由边界平衡计算是收敛的.

The Tokamak equilibrium fitting numerical calculation code EFIT is modified to study the MHD （magnetohydrodynamics） equilibrium in an EAST device. The divertor configuration in the steady-state phase of the EAST device is simulated with the modified cede. A method is proposed to satisfy the free boundary equilibrium for non-symmetrical current, by using linear equation array with the current of poloidal field coils as the main confined condition and expected configuration as the auxiliary confined condition. It is shown that the method can be used to obtain the equilibrium configuration which is induced by non-symmetrical current, and to solve the non-convergence problem of a free boundary equilibrium.