Mr. Jonathan Knopp Profile

Jonathan Knopp

at Argonne National Lab

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Proceedings Article | 8 September 2021 Presentation + Paper

Design of the in situ nanoprobe beamline at the Advanced Photon Source

Jörg Maser, Vincent De Andrade, Steven Kearney, Jonathan Knopp, Barry Lai, Tim Mooney, Curt Preissner, Luca Rebuffi, Ruben Reininger, Oliver Schmidt, Xianbo Shi, Christian Roehrig, Deming Shu, Si Chen

Proceedings Volume 11839, 1183905 (2021) https://doi.org/10.1117/12.2596609

KEYWORDS: Diffraction, Magnetism, X-ray sources, Satellites, Monochromators

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We will present the design for the In-Situ Nanoprobe (ISN) beamline that is being developed as part of the Upgrade of the APS storage ring with an MBA magnetic lattice. The ISN will provide large working distance of 60 mm for in-situ and operando environments, and a small spot of 20 nm (25 keV) for imaging materials with small defects and functional components. To achieve both long working distance and small spot size, Kirkpatrick-Baez mirrors will be used as nanofocusing optics. The major contrast mechanisms will be XRF imaging for chemical characterization ptychography for transmission imaging with sub-10 nm resolution. Auxiliary diffraction capabilities will allow monitoring of phase change during in-situ studies. To achieve the demagnification required to achieve small spot sizes, the ISN instrument will be placed at a distance of 220 m from the x-ray source, in a satellite building outside the APS storage ring. The ISN will provide hard x-rays with photon energy between 4.8 keV and 30 keV, enabling access to the absorption edges of to most elements in the periodic system. The MBA lattice and insertion devices, coupled with the high reflectivity of the K-B mirror system, provide a very high coherent flux of above 4*10¹² Ph/s at 5 keV, and 6*10¹² Ph/s at 30 keV. This allows hierarchical imaging of large samples with very small spot size, as well as multidimensional imaging, such as 3D imaging and temperature change, or 2D imaging with change of several environmental parameters. The ISN will provide flow of fluids, gases, and variable temperature.

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