HL-2A中线圈电流相位差影响等离子体对共振磁扰动的响应过程

The Phase Difference of Coil Current in HL-2A Affects the Response Process of Plasma to Resonant Magnetic Perturbations

等离子体对共振磁扰动的响应是理解共振磁扰动物理的关键,本文利用MARS-F代码在HL-2A装置真实等离子体位形下模拟等离子体对共振磁扰动的线性响应过程。在HL-2A装置中共振磁扰动线圈的上下线圈电流相位差的选择只能是180°(奇宇称)和0°(偶宇称),本文对这2种相位差下的响应情况进行了详细的比较分析研究。研究发现当RMP线圈电流相位为奇宇称时,产生的响应场更强,且能引起最大X点位移,更有利于ELM的控制,是HL-2A实验中选择的最优配置;扰动场在非有理面上的放大效应主要由芯部扭曲响应引起。

The response of plasma to RMPs is the key to understand the RMP physics.In this work,MARS-F code is used to simulate the linear response process of plasma to resonance magnetic disturbance in the real plasma configuration of HL-2 A device.In the HL-2 A device,the current phase difference between the upper and lower coils of the resonant magnetic perturbation coil can only be selected as 180°(odd parity)and 0°(even parity).In this paper,the response conditions under these two phase differences are compared and analyzed in detail.It is found that when the current phase of RMP coil is odd,the response field is stronger,and can cause the maximum x-point displacement,which is more conducive to the control of ELM,and is the optimal configuration chosen in HL-2 A experiment.What’s more,the ampli?cation effect of the magnetic perturbation on the nonrational surface is mainly caused by the core-kink response.