Inverse problems in new X-ray imaging techniques: Tools, algorithms and future prospects

Event Sponsor: 
Mathmatics and Computer Science Division Seminar - LANS
Start Date: 
Sep 12 2018 - 10:30am
Building 240/Room 4301
Argonne National Laboratory
Siddharth Maddali Vivekanand
Speaker(s) Title: 
Postdoctoral Appointee, MSD/ANL

The hardware upgrades at the Advanced Photon Source (APS) over the next few years will bring with them the capability to probe materials with X-rays in ways that were unfeasible so far. The new experiments will result in increased volumes and various complex representations of materials data, with tremendous scope for the development of new analysis techniques. These methods, whose initial development is currently underway, potentially call for a variety of intersecting expertise in physics and applied mathematics. In this talk I will describe some of this current work in our group, largely focused on inverse problems in materials imaging, which include signal processing for X-ray scattering data and new methods of phase retrieval. In addition to some related past work that touches upon robust optimization, I will talk about future computational prospects in the problem of polycrystal imaging. This problem, whose success is heavily invested in the APS upgrade, will potential ly require the development of optimization and machine learning methods (particularly deep learning) in conjunction with accurate physical modeling wherever required along its data acquisition/processing pipeline. In summary, I will provide a broad view of the potential avenues of computational development in this area of inverse problems in coherent X-ray imaging.

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Upcoming Seminars
August 29, 2018, "Randomization for the Efficient Computation of Reduced Order Models" Selin Sariaydin, Postdoctoral Appointee, XSD/ANL
September 5, 2018, "New Polynomial-free, Variable High-order Methods using Gaussian Process Modeling for CFD" Dongwook Lee, Associate Professor, Applied Mathematics & Statistics, UC Santa Cruz
September 12, 2018, "Inverse problems in new X-ray imaging techniques: Tools, algorithms and future prospects" Siddharth Maddali Vivekanand, Postdoctoral Appointee, MSD/ANL
September 19, 2018, "TBA" Emil Constantinescu, Computational Mathematician, MCS/ANL
September 21, 2018, "Solving Multi-Leader-Follower Games by Smoothing the Follower's Best Response" Anna Thuenen, Research Assistant, Institute for Geometry and Practical Mathematics, RWTH Aachen University
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October 17, 2018, "TBA" Kevin Gimpel, Assistant Professor, Toyota Technological Institute at Chicago
October 24, 2018, "TBA" Dmitriy Drusvyatskiy, Assistant Professor, Department of Mathematics, University of Washington