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Title: Electronic effects in high-energy radiation damage in tungsten

Even though the effects of the electronic excitations during high-energy radiation damage processes are not currently understood, it is shown that their role in the interaction of radiation with matter is important. We perform molecular dynamics simulations of high-energy collision cascades in bcc-tungsten using the coupled two-temperature molecular dynamics (2T-MD) model that incorporates both the effects of electronic stopping and electron–phonon interaction. We compare the combination of these effects on the induced damage with only the effect of electronic stopping, and conclude in several novel insights. In the 2T-MD model, the electron–phonon coupling results in less damage production in the molten region and in faster relaxation of the damage at short times. We show these two effects lead to a significantly smaller amount of the final damage at longer times.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Queen Mary University of London, London (United Kingdom)
  2. Univ. College London, Bloomsbury (United Kingdom). London Centre for Nanotechnology, Department of Physics and Astronomy
  3. Univ. of Helsinki (Finland)
  4. STFC Daresbury Laboratory, Daresbury, Warrington, Cheshire (United Kingdom). Scientific Computing Department
  5. STFC Daresbury Laboratory, Daresbury, Warrington, Cheshire (United Kingdom). Scientific Computing Department
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
  7. Queen Mary University of London, London (United Kingdom)
Publication Date:
OSTI Identifier:
1265368
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 27; Journal Issue: 13; Journal ID: ISSN 0953-8984
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS Tungsten; Radiation Damage; Electronic Effects; Molecular Dynamics