ITER Tokamak Physics as Early Science on Aurora


What is ITER? ITER is the world's largest fusion experiment. Thirty-five nations spanning the globe are collaborating to build and operate the ITER Tokamak in France, an experimental machine designed to harness the energy of fusion. Under the ALCF Aurora Early Science Program, a project is preparing an exascale simulation of impurity ion physics in the ITER Tokamak. Understanding in detail how these ions interplay with primary plasma dynamics and how they impact the performance of the fusion energy device is an important open question. Capturing this physics using the XGC application will take advantage of Aurora’s accelerated compute architecture, high-bandwidth memory, and innovative I/O system.


Tim Williams, Deputy Division Director of Computational Science and Early Science Program Manager at Argonne National Laboratory

Dr. Timothy Williams is the Deputy Director of Argonne’s Computational Science Division. During 2016-2018, Tim served as Deputy Director of Science for the Argonne Leadership Computing Facility (ALCF), for which he still manages the Early Science Program. Since 2009, he has worked with a number of large-scale projects using ALCF’s supercomputers, especially those in the area of plasma physics. From 2000-2006, Tim worked as a quantitative software developer in the financial industry, writing pricing and risk software for Morgan Stanley in New York and Citadel in Chicago. From 1995-2000, he was a staff scientist at LANL’s Scientific Computing Group and Advanced Computing Laboratory, working on a C++ framework for parallel scientific computing. Starting as a postdoc in the Magnetic Fusion Energy group and Massively Parallel Computing Initiative at LLNL, and later on the NERSC staff; Tim spent 1989-1995 doing research in tokamak plasma turbulence and other areas, and developing a long-term interest in large-scale parallel computing.