Flexibility and utility of pre-processing methods in converting STXM setups for ptychography - Final Paper

Technical Report · Thu Aug 20 00:00:00 EDT 2015

DOI:https://doi.org/10.2172/1213189· OSTI ID:1213189

Fromm, Catherine ^[1]

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1. SLAC National Accelerator Lab., Menlo Park, CA (United States)

Ptychography is an advanced diffraction based imaging technique that can achieve resolution of 5nm and below. It is done by scanning a sample through a beam of focused x-rays using discrete yet overlapping scan steps. Scattering data is collected on a CCD camera, and the phase of the scattered light is reconstructed with sophisticated iterative algorithms. Because the experimental setup is similar, ptychography setups can be created by retrofitting existing STXM beam lines with new hardware. The other challenge comes in the reconstruction of the collected scattering images. Scattering data must be adjusted and packaged with experimental parameters to calibrate the reconstruction software. The necessary pre-processing of data prior to reconstruction is unique to each beamline setup, and even the optical alignments used on that particular day. Pre-processing software must be developed to be flexible and efficient in order to allow experiments appropriate control and freedom in the analysis of their hard-won data. This paper will describe the implementation of pre-processing software which successfully connects data collection steps to reconstruction steps, letting the user accomplish accurate and reliable ptychography.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1213189
• Report Number(s): SLAC-TN-15-030
• Resource Relation: Conference: Boston, MA (United States), 19-23 Jul 2015
• Country of Publication: United States
• Language: English