Chung J, Ko J, De Bock M F M, Jaspers R J E
National Fusion Research Institute, Yuseong, Daejeon 305-333, South Korea.
Eindhoven University of Technology, 5612 AZ, Eindhoven, The Netherlands.
Rev Sci Instrum. 2014 Nov;85(11):11D827. doi: 10.1063/1.4891161.
The motional Stark effect (MSE) diagnostic is used to measure the radial magnetic pitch angle profile in neutral beam heated plasmas. This information is used to calculate the safety factor, q, with magnetic equilibrium reconstruction codes such as EFIT. The MSE diagnostic is important during active shaping of the q profile to optimize confinement and stability, and it has become a key diagnostic in high performance tokamaks. A multichord photo-elastic modulator (PEM) based MSE system is being developed for a real-time plasma current profile control in Korea Superconducting Tokamak Advanced Research (KSTAR). The PEM-based approach is a standard method that measures the polarization direction of a single Stark line with narrow tunable bandpass filters. A tangential view of the heating beam provides good spatial resolution of 1-3 cm, which provides an opportunity to install 25 spatial channels spanning the major radius from 1.74 m to 2.84 m. Application of real-time control is a long-term technical goal after commissioning the diagnostic in KSTAR, which is expected in 2015. In this paper, we describe the design of this newly-constructed multichord MSE diagnostic in KSTAR.
运动斯塔克效应（MSE）诊断用于测量中性束加热等离子体中的径向磁螺距角分布。该信息用于通过诸如EFIT等磁平衡重建代码来计算安全因子q。在q分布的主动成形过程中，MSE诊断对于优化约束和稳定性很重要，并且它已成为高性能托卡马克中的关键诊断手段。韩国超导托卡马克先进研究装置（KSTAR）正在开发一种基于多弦光弹性调制器（PEM）的MSE系统，用于实时控制等离子体电流分布。基于PEM的方法是一种标准方法，它使用窄可调带通滤波器测量单个斯塔克线的偏振方向。加热束的切向视图提供了1 - 3厘米的良好空间分辨率，这为安装25个跨越从1.74米到2.84米主半径的空间通道提供了机会。实时控制的应用是在KSTAR中调试该诊断（预计在2015年）之后的一个长期技术目标。在本文中，我们描述了KSTAR中新构建的多弦MSE诊断的设计。
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