Investigation of aperiodic W/C multi-layer mirror for X-ray optics |
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Authors: | Zhanshan Wang Xinbin ChengJingtao Zhu Qiushi HuangZhong Zhang Lingyan Chen |
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Affiliation: | Institute of Precision Optical Engineering (IPOE), Physics Department, Tongji University, Shanghai 200092, China |
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Abstract: | Design, fabrication and characterization of aperiodic tungsten/carbon (W/C) multi-layer mirror were studied. W/C multi-layer was designed as a broad-angle reflective supermirror for Cu-Kα line (λ = 0.154 nm) in the grazing incident angular range (0.9-1.1°) using simulated annealing algorithm. To deposit the W/C depth-graded multi-layer mirror accurately, we introduce an effective layer growth rate as a function of layer thickness. This method greatly improves the reflectivity curve compared to the conventional multi-layer mirror prepared with constant growth rate. The deposited multi-layer mirror exhibits an average reflectivity of 19% over the grazing incident angle range of 0.88-1.08° which mainly coincides with the designed value. Furthermore, the physical mechanisms were discussed and the re-sputtering process of light-atom layers is accounted for the modification of layer thicknesses which leads to the effective growth rates. Using this calibration method, the aperiodic multi-layer mirrors can be better fabricated for X-ray optics. |
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Keywords: | X-ray optics Multi-layer mirror Aperiodic Magnetron sputtering Supermirror |
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