Design of a multilayer-based collimated plane-grating monochromator for tender X-ray range

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• 作者：Xiaowei Yang ; Hongchang Wang ; Matthew Hand ; Kawal Sawhney ; Burkhard Kaulich ; Igor V. Kozhevnikov ; Qiushi Huang and Zhanshan Wang
• 关键词：X-ray optics ; monochromator ; diffraction grating ; multilayer
• 刊名：Journal of Synchrotron Radiation
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：168-174
• 全文大小：820K
• ISSN：1600-5775

文摘

Collimated plane-grating monochromators (cPGMs), consisting of a plane mirror and plane diffraction grating, are essential optics in synchrotron radiation sources for their remarkable flexibility and good optical characteristics in the soft X-ray region. However, the poor energy transport efficiency of a conventional cPGM (single-layer-coated) degrades the source intensity and leaves reduced flux at the sample, especially for the tender X-ray range (1–4 keV) that covers a large number of K- and L-edges of medium-Z elements, and M-edges of high-Z elements. To overcome this limitation, the use of a multilayer-based cPGM is proposed, combining a multilayer-coated plane mirror with blazed multilayer gratings. With this combination, the effective efficiency of cPGMs can be increased by an order of magnitude compared with the conventional single-layer cPGMs. In addition, higher resolving power can be achieved with improved efficiency by increasing the blaze angle and working at higher diffraction order.