Study of transmutation, gas production, and displacement damage in chromium for fusion neutron spectrum

M Rajput and R Srinivasan, ANNALS OF NUCLEAR ENERGY, 138, 107187 (2020).

DOI: 10.1016/j.anucene.2019.107187

In the present work, gas production, transmutation and displacement damage in chromium are studied for fusion neutron spectra. The nuclear cross-section data are calculated with the TALYS-1.8 code. Transmutated isotopes in chromium, including the radioactive ones, are identified for typical fusion reactor neutron spectrum. Gas production per atom (He and H production) are also predicted for typical fusion neutron spectrum. Molecular dynamics (MD) simulations of damage cascade caused by the self-recoil in chromium are carried out for up to 200 keV damage energies using the LAMMPS code. Time evolution of interstitials and vacancies are studied and discussed. Based on the performed MD simulations, constant parameters of the athermal-recombination corrected dpa (arc-dpa) method are calibrated. Displacement damage cross-section of chromium are calculated using the Norgett-Robinson and Torrens (NRT) and arc-dpa approaches and later used to predict the values of displacement per atoms (dpa) in chromium for typical fusion reactor neutron environment. (C) 2019 Elsevier Ltd. All rights reserved.

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