论文标题
抗碱性C-MOD上实验性径向杂质转运的推断：贝叶斯参数估计和模型选择
Inference of Experimental Radial Impurity Transport on Alcator C-Mod: Bayesian Parameter Estimation and Model Selection
论文作者
论文摘要
我们提出了一种完全贝叶斯的方法，用于推断杂质转运系数的径向谱，并将其结果与新古典，陀螺仪和陀螺仪建模进行比较。使用嵌套采样，贝叶斯杂质传输推理（咬合）框架可以处理具有多种可能解决方案的复杂参数空间，从而在解释性功率方面具有很大的优势，并且相对于先前所证明的方法提供了可靠性。 Bite采用基于Pystrahl软件包的前向模型，建立在著名的Strahl代码[DUX，IPP报告，2004年]的成功之上，以模拟磁性等离子体中的杂质传输。在本文中，我们将重点放在钙（CA，Z = 20）激光吹射式注射中，以抗体C-MOD等离子体。通过高分辨率X射线成像晶体光谱和真空超紫色测量值诊断出多个CA原子线。我们分析了一个锯齿i模式排放，还可以获得新古典和湍流（准线性和非线性）预测。我们发现在整个径向范围内的扩散方面有很好的一致性，而在实验中估计湍流对流和密度峰值峰值比理论所建议的要大。讨论了与实验基座杂质转运的推断相关的努力和挑战。
We present a fully Bayesian approach for the inference of radial profiles of impurity transport coefficients and compare its results to neoclassical, gyrofluid and gyrokinetic modeling. Using nested sampling, the Bayesian Impurity Transport InferencE (BITE) framework can handle complex parameter spaces with multiple possible solutions, offering great advantages in interpretative power and reliability with respect to previously demonstrated methods. BITE employs a forward model based on the pySTRAHL package, built on the success of the well-known STRAHL code [Dux, IPP Report, 2004], to simulate impurity transport in magnetically-confined plasmas. In this paper, we focus on calcium (Ca, Z=20) Laser Blow-Off injections into Alcator C-Mod plasmas. Multiple Ca atomic lines are diagnosed via high-resolution X-ray Imaging Crystal Spectroscopy and Vacuum Ultra-Violet measurements. We analyze a sawtoothing I-mode discharge for which neoclassical and turbulent (quasilinear and nonlinear) predictions are also obtained. We find good agreement in diffusion across the entire radial extent, while turbulent convection and density profile peaking are estimated to be larger in experiment than suggested by theory. Efforts and challenges associated with the inference of experimental pedestal impurity transport are discussed.
