现代部分相干x射线源的斑点交叉谱密度及其相关奇异性
Speckled cross-spectral densities and their associated correlation singularities for a modern source of partially coherent x rays
摘要：
我们考虑一个现实的模型计算交叉谱密度的部分相干光束从一个X射线波荡器在现代储存环。这两点的相干函数被认为是有一个斑点的结构与存在的X射线相干涡旋和域壁。这种交叉谱密度散斑与零相关的点的空间对的网络相关联。X射线相干涡旋和畴壁被认为是自然出现的相干模式的数量增加所需的。这种相关奇点的存在和性质的理解，提高了我们的能力，利用新的或升级的同步辐射源的部分相干x射线辐射，成像和衍射应用。
英文摘要：
We consider a realistic model for calculating the cross-spectral density of partially coherent beams from an x-ray undulator in a modern storage ring. This two-point coherence function is seen to have a speckled structure associated with the presence of x-ray coherence vortices and domain walls. Such cross-spectral density speckle is associated with a network of spatial pairs of points for which there is zero correlation. X-ray coherence vortices and domain walls are seen to emerge naturally as the number of coherent modes required increases. An understanding of the existence and nature of such correlation singularities enhances our ability to exploit partially coherent x-ray radiation from new or upgraded synchrotron sources, for both imaging and diffraction applications.
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