Modeling high-energy radiation damage in nuclear and fusion applications

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:277

Article

Trachenko, K.^1,2  Zarkadoula, E.^1,2  Todorov, I. T.³  Dove, M. T.^1,4  Dunstan, D. J.¹  Nordlund, K.⁵ 

[1] Univ London, Sch Phys, London E1 4NS, England

[2] Univ Southampton Highfield, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[3] CCLRC Daresbury Lab, Computat Sci & Engn Dept, Daresbury WA4 4AD, England

[4] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

[5] Univ Helsinki, Accelerator Lab, FIN-00014 Helsinki, Finland

关键词: Radiation damage;    Molecular dynamics;    Collision cascades;    Nuclear energy;    Nuclear waste;    Fusion energy;   

DOI  :  10.1016/j.nimb.2011.12.058

来源: Elsevier

【 摘 要 】

We discuss molecular dynamics (MD) simulations of high-energy radiation damage in materials relevant for encapsulation of nuclear waste and materials to be used in fusion reactors, including several important oxides and iron. We study various stages of evolution and relaxation of 100-200 key collision cascades, and identify reversible elastic and irreversible inelastic structural changes. The elastic expansion of the lattice around the cascade is explained in terms of anharmonicity of interatomic interactions. The remaining irreversible structural change is related to resistance to amorphization by radiation damage. This resistance is quantified by the number of remaining defect atoms in the damaged structure. We discuss how MD simulations can predict experimental resistance to amorphization, including the important case of highly resistant materials. Finally, we discuss our current work to simulate radiation damage of MeV energies and system sizes of the order of billion atoms using massive parallel computing facilities. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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