Abstract
Optical vortices have the main features of helical wavefronts and spiral phase structures, and carry orbital angular momentum. This special structure of visible light has been produced and studied for various applications. These notable characteristics of photons were also tested in the extreme-ultraviolet and X-ray regimes. In this article, we simulate the use of a simple afterburner configuration by directly adding helical undulators after the SASE undulators with the Shanghai Soft X-ray FEL to generate high intensity X-ray vortices with wavelengths \(\sim 1\,{\hbox {nm}}\). Compared to other methods, this approach is easier to implement, cost-effective, and more efficient.
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Acknowledgements
We appreciate the stimulating discussions with Nanshun Huang, Zhichu Chen, Hailong Wu, Bo Liu, and Dong Wang of Shanghai Advanced Research Institute, Chinese Academy of Sciences.
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This work was supported by the National Development and Reform Commission ([2013]2347) and National Basic Research Program of China (No. 2015CB859700).
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Geng, HP., Chen, JH. & Zhao, ZT. Scheme for generating 1 nm X-ray beams carrying orbital angular momentum at the SXFEL. NUCL SCI TECH 31, 88 (2020). https://doi.org/10.1007/s41365-020-00794-7
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DOI: https://doi.org/10.1007/s41365-020-00794-7