Data assimilation and application in radiation physics and shielding

1.开发和测试新的，有效的灵敏度技术在SCONE上高保真的问题，展示他们的速度比天真的方法。2.将此敏感性分析应用于劳斯莱斯感兴趣的代表性问题。这可能包括获得对材料边界的敏感性，为此在特征值上下文中进行了一些工作[3]。在数据同化框架中将获得的灵敏度与实验测量相结合，以最大限度地减少不确定性或校准不确定的模式输入。为感兴趣的问题生成高阶灵敏度，允许使用更复杂的数据同化方法，例如，模型输入的协方差是已知的。这允许放宽假设，即响应分布是高斯输入参数和更好地表征真实分布。5.探索通过混合多组和连续能量计算加速权重窗口生成。

1. Develop and test new, efficient sensitivity techniques in SCONE on high-fidelity problems, demonstrating their speed-up over naïve approaches.2. Apply this sensitivity analysis to a representative problem of interest for Rolls Royce. This may include obtaining sensitivities to material boundaries, for which some work has been performed in the eigenvalue context [3].3. Combine the obtained sensitivities with experimental measurements in a data assimilation framework in order to minimise uncertainties or calibrate uncertain model inputs.4. Generate higher-order sensitivities for the problems of interest, allowing use of more sophisticated data assimilation approaches where, e.g., the covariance of the model inputs isknown. This allows for relaxing the assumption that the response distribution is Gaussian in the input parameters and better characterising the true distribution.5. Explore accelerated weight-window generating through hybrid multi-group and continuous energy calculations.