NanoMAX example dataset - multi slice ptychography

Example multi-slice hard X-ray ptychographic dataset recorded at the Imaging Endstation (EH1) [1] of the NanoMAX beamline [2] at the MAX IV Laboratory[3]. The dataset is part of the results reported in [4]. It is kept in the folder and file structure typical to the lab and beamline. It contains the raw data, the script used to reconstruct the raw data, the intermediate and final reconstruction results and a jupyter notebook loading the reconstructions to create a figure of the reconstructed object slices. Data was recorded at a photon energy of 8 keV. Fresnel zone plates [5] were used to focus the probing X-ray beam. The sample is described in the original publication [4]. The sample was scanned in a Fermat-spiral scanning pattern [6] over a scan region of 12µm x 12µm with an average step size of 0.5µm. At each scan position a diffraction pattern was recorded with an Eiger2 X 4M detector (DECTRIS, Switzland) [7] and an exposure time of 2 seconds. The detector was positioned 4.18m downstream of the sample. Reconstructions were performed using the ptypy-framework [8] using 500 iterations of the 3PIE algorithm [9] implemented for CPUs. We acknowledge the MAX IV Laboratory for beamtime on the NanoMAX beamline under proposal 20221287. Research conducted at MAX IV, a Swedish national user facility, is supported by Vetenskapsrådet (Swedish Research Council, VR) under contract 2018-07152, Vinnova (Swedish Governmental Agency for Innovation Systems) under contract 2018-04969 and Formas under contract 2019-02496. References: [1] Maik Kahnt et al., "Current capabilities of the imaging endstation at the NanoMAX beamline", AIP Conf. Proc. 27 September 2023; 2990 (1): 040018. https://doi.org/10.1063/5.0169244 [2] Ulf Johansson et al., "NanoMAX: the hard X-ray nanoprobe beamline at the MAX IV Laboratory", J. Synchrotron Rad. 28, 1935-1947 (2023). https://doi.org/10.1107/S1600577521008213 [3] Aymeric Robert et al., "MAX IV Laboratory". Eur. Phys. J. Plus 138, 495 (2023). https://doi.org/10.1140/epjp/s13360-023-04018-w [4] Mattias Åstrand et al. "Multi-beam multi-slice X-ray ptychography". Sci Rep 15, 9273 (2025). https://doi.org/10.1038/s41598-025-93757-0 [5] Hanna Ohlin et a.l, "Miniaturized Sulfite-Based Gold Bath for Controlled Electroplating of Zone Plate Nanostructures". Micromachines, 13(3), 452 (2022). https://doi.org/10.3390/mi13030452 [6] Xiaojing Huang et al., "Optimization of overlap uniformness for ptychography", Opt. Express 22, 12634-12644 (2014). https://doi.org/10.1364/OE.22.012634 [7] Tilman Donath et al., "EIGER2 hybrid-photon-counting X-ray detectors for advanced synchrotron diffraction experiments", J. Synchrotron Rad. 30, 723-738.(2023). https://doi.org/10.1107/S160057752300454X [8] Björn Enders et al., "Computational framework for ptychographic reconstructions", Proc. R. Soc. A.47220160640 (2016). http://doi.org/10.1098/rspa.2016.0640 [9] Andrew M. Maiden et al., "Ptychographic transmission microscopy in three dimensions using a multi-slice approach," J. Opt. Soc. Am. A 29, 1606-1614 (2012). https://doi.org/10.1364/JOSAA.29.001606