The theoretical analysis of the hard X-ray block-structure supermirror.
The theoretical analysis of the hard X-ray block-structure supermirror.
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DOI：
10.1364/oe.21.008638
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发表时间：
2013-04
期刊：
影响因子：
3.8
通讯作者：
Youwei Yao;H. Kunieda;Zhanshan Wang
中科院分区：
文献类型：
--
作者：
Youwei Yao;H. Kunieda;Zhanshan Wang
We present an analytical study to provide guide lines to design a block structure hard X-ray supermirror. The block structure supermirror is a kind of layered structure consisting of several "blocks" of multilayer of different d-spacing to obtain broad energy bandwidth response. This structure has been widely applied in X-ray telescopes because it is easy to fabricate. To examine the propagation of X-rays in a supermirror structure, further simplified approximation of Kozhevnikov's theory has been developed. The supermirror structure is described by a structure function. The spectral function of the structure, which is the Laplace transformation of the structure function, turns out to be proportional to the reflectivity profile against X-ray energy. By analyzing the expression of the spectral function, we found the reflectivity of the supermirror could be smooth due to the box-car shaped spectral function if the d-spacing and layer number of each block is arranged with appropriate constraints.
