Numerical study of ion orbits in EAST plasmas with a current-reversal equilibrium configuration
Numerical study of ion orbits in EAST plasmas with a current-reversal equilibrium configuration
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DOI：
10.3938/jkps.66.1692
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发表时间：
2015-06
影响因子：
0.6
通讯作者：
Y. Zhong;X. Gong;Ye-ming Hu;Xinxia Li
中科院分区：
文献类型：
--
作者：
Y. Zhong;X. Gong;Ye-ming Hu;Xinxia Li
通过求解柱坐标系下的Grad-Shafranov方程，利用实验先进超导托卡马克（EAST）的放电参数，数值计算了常规模式和高低场侧电流反转平衡模式（HL-CREC）的托卡马克等离子体平衡位形。通过与粒子的运动方程耦合，得到了两种平衡构型下捕获粒子和通过粒子的轨道。我们发现，在HL-CREC中，通过粒子的轨道完全被限制在低场一侧，被俘获粒子的香蕉轨道的半宽度比传统平衡位形中的大得多。此外，基于蒙特卡罗方法对离子损失进行了研究。结果表明，对于靠近等离子体边缘的离子，HL-CREC中的离子损失率比常规平衡位形中的离子损失率高得多。
By solving the Grad-Shafranov equation in the cylindrical coordinate system, we numerically obtain the tokamak plasma equilibrium configurations of the conventional mode and the high-to-lowfield-side current-reversal equilibrium mode (HL-CREC) by using the discharge parameters for the Experimental Advanced Superconductor Tokamak (EAST). By coupling with the particle’s motion equation, we obtain the orbits of trapped particles and passing particles under both equilibrium configurations. We find that the orbit of the passing particle in the HL-CREC is wholly confined on the low-field side and that the half width of the banana orbit of trapped particles increases greatly compared with those in the conventional equilibrium configuration. In addition, the ion loss is studied based on the Monte Carlo method. The results show that for ions near the plasma edge, a much high ion loss rate can be obtained in HL-CREC than that in the conventional equilibrium configuration.