Kim J S, Zhao L, Bogatu I N, In Y, Turnbull A, Osborne T, Maraschek M, Comer K
FAR-TECH, Inc., 3550 General Atomics Court, Building 15, Suite 155, San Diego, California 92121, USA.
Rev Sci Instrum. 2009 Nov;80(11):113503. doi: 10.1063/1.3245344.
The numerical toolset, FAR-TECH Virtual Diagnostic Utility, for generating virtual experimental data based on theoretical models and comparing it with experimental data, has been developed for soft x-ray diagnostics on DIII-D. The virtual (or synthetic) soft x-ray signals for a sample DIII-D discharge are compared with the experimental data. The plasma density and temperature radial profiles needed in the soft x-ray signal modeling are obtained from experimental data, i.e., from Thomson scattering and electron cyclotron emission. The virtual soft x-ray diagnostics for the equilibriums have a good agreement with the experimental data. The virtual diagnostics based on an ideal linear instability also agree reasonably well with the experimental data. The agreements are good enough to justify the methodology presented here for utilizing virtual diagnostics for routine comparison of experimental data. The agreements also motivate further detailed simulations with improved physical models such as the nonideal magnetohydrodynamics contributions (resistivity, viscosity, nonaxisymmetric error fields, etc.) and other nonlinear effects, which can be tested by virtual diagnostics with various stability modeling.
已开发出数值工具集FAR-TECH虚拟诊断实用程序，用于基于理论模型生成虚拟实验数据并将其与实验数据进行比较，该程序用于DIII-D装置的软X射线诊断。将一个示例DIII-D放电的虚拟（或合成）软X射线信号与实验数据进行比较。软X射线信号建模所需的等离子体密度和温度径向分布是从实验数据中获得的，即从汤姆逊散射和电子回旋辐射中获得。平衡态的虚拟软X射线诊断与实验数据吻合良好。基于理想线性不稳定性的虚拟诊断与实验数据也相当吻合。这些吻合程度足以证明此处提出的利用虚拟诊断对实验数据进行常规比较的方法是合理的。这些吻合也促使人们使用改进的物理模型进行进一步的详细模拟，如非理想磁流体动力学贡献（电阻率、粘度、非轴对称误差场等）和其他非线性效应，这些可以通过具有各种稳定性建模的虚拟诊断来检验。
