Large-scale molecular dynamics simulations of dense plasmas: The Cimarron Project |
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Authors: | Frank R. Graziani Victor S. Batista Lorin X. Benedict John I. Castor Hui Chen Sophia N. Chen Chris A. Fichtl James N. Glosli Paul E. Grabowski Alexander T. Graf Stefan P. Hau-Riege Andrew U. Hazi Saad A. Khairallah Liam Krauss A. Bruce Langdon Richard A. London Andreas Markmann Michael S. Murillo David F. Richards Howard A. Scott Heather D. Whitley |
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Affiliation: | 1. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;2. Computational Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;3. Department of Chemistry, Yale University, New Haven, CT 06520-8107, USA;4. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260-8709, USA |
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Abstract: | We describe the status of a new time-dependent simulation capability for dense plasmas. The backbone of this multi-institutional effort – the Cimarron Project – is the massively parallel molecular dynamics (MD) code “ddcMD,” developed at Lawrence Livermore National Laboratory. The project’s focus is material conditions such as exist in inertial confinement fusion experiments, and in many stellar interiors: high temperatures, high densities, significant electromagnetic fields, mixtures of high- and low-Z elements, and non-Maxwellian particle distributions. Of particular importance is our ability to incorporate into this classical MD code key atomic, radiative, and nuclear processes, so that their interacting effects under non-ideal plasma conditions can be investigated. This paper summarizes progress in computational methodology, discusses strengths and weaknesses of quantum statistical potentials as effective interactions for MD, explains the model used for quantum events possibly occurring in a collision, describes two new experimental efforts that play a central role in our validation work, highlights some significant results obtained to date, outlines concepts now being explored to deal more efficiently with the very disparate dynamical timescales that arise in fusion plasmas, and provides a careful comparison of quantum effects on electron trajectories predicted by more elaborate dynamical methods. |
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