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Wonsuk Cha1 Stephan Hruszkewycz1 Mathew Cherukara1 Ross Harder1

1, Argonne National Laboratory, Argonne, Illinois, United States

Bragg coherent x-ray diffraction imaging (BCDI) has been employed on various nanoscaled crystalline materials to image the distribution of strain and lattice distortion with non-destructive measurements. In-situ and/or operando imaging became a major driver for BCDI to address scientific questions on physics and chemistry in recent years. Many efforts have been made to surpass the current state-of-art of BCDI and world leading synchrotrons, such as APS, ESRF, and Petra IV, are planning to upgrade x-ray sources to deliver more coherent photons which is essential for BCDI.
In this study, I will introduce current status of BCDI as well as a new approach for BCDI that exploit tunable x-ray wavelengths to eliminate the requirement of the sample rotation for 3D imaging which often bothers in-situ or operando experiments. We have measured 3D coherent diffraction patterns around Au (111) Bragg peak with energy scans and successfully reconstructed the image of the sample with new phase retrieval algorithm. In addition, I will talk about the way for collecting 3D dataset within short time using broadband x-rays and the experimental setup which disperses diffracted polychromatic x-rays into monochromatic patterns in parallel with a stack of analyzers. In the last part, BCDI with upgraded x-ray sources in the future will be discussed.

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