X-ray free-electron lasers (FELs) are being recognized as a powerful tool in an ever-increasing number of research fields, but are very limited as to the number of experiments that they can support. This work shows that more beamtime could be made available by using `parasitic' geometries, where a secondary experiment uses the X-ray beam that the primary experiment does not utilize. The first successful ptychography experiment, a scanning coherent diffractive imaging technique, in a parasitic geometry at an X-ray FEL is demonstrated. Utilizing the CXI hutch at the Linac Coherent Light Source (LCLS), it is shown that the obtained data are of high quality and that characterizing the beam using ptychography can be much faster than traditional imprinting methods.

中文翻译：

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寄生几何中直线加速器相干光源的 Ptychography

X 射线自由电子激光器 (FEL) 在越来越多的研究领域中被认为是一种强大的工具，但它们可以支持的实验数量非常有限。这项工作表明，通过使用“寄生”几何结构可以提供更多的光束时间，其中次要实验使用主要实验不使用的 X 射线束。第一个成功的 ptychography 实验，一种扫描相干衍射成像技术，在 X 射线 FEL 的寄生几何结构中进行了演示。利用直线加速器相干光源 (LCLS) 上的 CXI 储藏室，表明获得的数据具有高质量，并且使用 ptychography 表征光束比传统的压印方法快得多。