Ko J, Den Hartog D J, Caspary K J, Den Hartog E A, Pablant N A, Summers H P
University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Rev Sci Instrum. 2010 Oct;81(10):10D702. doi: 10.1063/1.3461995.
A high-precision spectral motional Stark effect (MSE) diagnostic provides internal magnetic field measurements for Madison Symmetric Torus (MST) plasmas. Currently, MST uses two spatial views--on the magnetic axis and on the midminor (off-axis) radius, the latter added recently. A new analysis scheme has been developed to infer both the pitch angle and the magnitude of the magnetic field from MSE spectra. Systematic errors are reduced by using atomic data from atomic data and analysis structure in the fit. Reconstructed current density and safety factor profiles are more strongly and globally constrained with the addition of the off-axis radius measurement than with the on-axis one only.
一种高精度光谱运动斯塔克效应（MSE）诊断方法可为麦迪逊对称环面（MST）等离子体提供内部磁场测量。目前，MST采用两种空间视角——磁轴处和小半径中间位置（离轴），后者是最近新增的。已开发出一种新的分析方案，用于从MSE光谱推断磁场的俯仰角和大小。通过在拟合中使用来自原子数据和分析结构的原子数据来减少系统误差。与仅使用轴上半径测量相比，增加离轴半径测量后，重建的电流密度和安全因子分布受到更强且更全面的约束。
