非共振磁扰动对误差场渗透的影响

ITER由于具有低转速运行的特征容易产生误差场渗透，引起锁模导致等离子体大破裂。为了避免这个问题的发生，近二十多年来，国际上许多著名托卡马克装置针对误差场渗透进行了大量专题研究。虽然这些渗透实验对许多参数给出了大量的定标分析，然而各装置定标结果存在较大差异，没有给出令人满意的结果。目前国际同行重点关注的非共振磁扰动，对等离子体旋转有较大影响。这意味着非共振磁扰动可能对误差场渗透也有重要影响。最近，在EAST上开展的固有误差场测量实验也表明非共振磁扰动对等离子体旋转有显著影响。基于此，我们拟在EAST上分别开展共振与非共振磁扰动主导下误差场渗透的实验研究。为了更好地理解非共振磁扰动在误差场渗透中的物理机制，我们还将通过在原有误差场渗透物理模型中加入非共振磁扰动相关的新经典环向粘滞分析给出理论模型下的结果。最后结合实验、理论及数值模拟，分析理解非共振磁扰动对误差场渗透的影响。

With the characteristic of low torque, ITER operation is easy to enter the error field penetration situation, and further leads to plasma disruption. To avoid this event, error field locked mode experiments were carried out in numerous distinguished tokamak devices in recent twenty years. Various parameter scalings are analyzed in these experiments. However, these scaling results did not give agreed answers. Nowadays, the critical focused non-resonant magnetic perturbations show prominent effects on plasma rotation, indicating non-resonant magnetic perturbations have significant effects on error field penetration. In the very recently, experiments on measurement of intrinsic error field showed that non-resonant component has a significant effect on plasma rotation in EAST. On the basis of these, we will carry on density scaling experiment under error field penetration at resonant or non-resonant components dominated cases, respectively, to estimate the non-resonant component effect. To better understand the underlying physics, we will also add non-resonant component relevant neoclassical toroidal viscosity (NTV) in the penetration physical model. In the end, experimental results, theoretical analysis and simulation will be combined to make clear the effects of the non-resonant magnetic perturbations on error field penetration.