EAST等离子体电流剖面实时重建研究

The ability to control plasma current profile is especially important for advanced tokamak to achieve steady-state operation with high performance fusion plasmas. Reliable and accurate real-time plasma current profile reconstruction is necessary for plasma current profile control. This application proposes that developing real-time plasma current profile reconstruction system based on internal plasma diagnostics in EAST, focus on research of current profile reconstruction algorithms base on faraday polarimeter-interferometer and motional stark effect diagnostics, real-time optimizing the algorithms and then integrating into plasma control system, analysis of current profile parameters' responses to various non-induction current drive methods in EAST. This study will provide important real-time current profile information and reference for designing controller in EAST plasma current profile feedback control.

等离子体电流剖面及安全因子控制对提高等离子体约束性能和稳定安全运行至关重要，是实现高参数稳态等离子体先进运行模式的必然需求。准确可靠的等离子体电流剖面实时重建是电流剖面实时反馈控制的重要基础。本项目拟基于等离子体实时剖面诊断数据，发展EAST等离子体电流剖面实时重建系统；重点研究基于运动斯塔克效应、激光偏振干涉仪诊断的剖面重建数值算法及其实时化，并整合入等离子体控制系统和实时平衡重建程序中；重点分析电流剖面相关参量在不同实验条件下对非感应电流驱动的响应规律。本项研究不仅可以为EAST进一步实现等离子体电流剖面反馈控制提供实时数据基础，亦可为电流剖面控制中控制器设计提供借鉴和参考。

等离子体电流剖面及安全因子控制对提高等离子体约束性能和稳定安全运行至关重要，是实现高参数稳态等离子体先进运行模式的必然需求。准确可靠的等离子体电流剖面实时重建是电流剖面实时反馈控制的重要基础。本项目基于EAST装置上运动斯塔克效应（Motional Stark Effect，MSE），激光偏振干涉仪（Polarimeter-interferometer，POINT）和电磁测量诊断，发展了电流剖面重建算法，利用EAST和DIII-D诊断和实验数据，校验了重建算法的可靠性和有效性；同时整合电流剖面重建算法到实时平衡重建程序P-EFIT中，经过优化与测试后，算法实时性满足未来实时控制需求；最后，基于P-EFIT计算所得的剖面参数，基于系统辨识方法，得到了EAST上电流剖面参数对波加热电流系统响应模型。这些算法发展与实验结果为进一步开展EAST等离子体电流剖面参数实时反馈控制做好铺垫，为EAST等离子体位形和分布参数的集成控制提供必要的技术基础，且为未来ITER实时平衡与剖面重建提供算法可行性与精度参考。