Comparative study of damage accumulation in iron under magnetic and inertial fusion conditions

We present results of kinetic Monte Carlo (KMC) simulations of damage accumulation in Fe under conditions relevant to inertial (IFE) and magnetic fusion energy (MFE), with input obtained from molecular dynamics (MD). MD simulations provide information on the primary state of damage and were carried out for cascades with primary knockon atom (PKA) energies ranging from 100 eV to 50 keV. These were used as input for a KMC simulation in which pulsed IFE irradiation and continuous MFE irradiation were simulated and compared. The MD collision cascades were introduced into the KMC simulation reproducing a recoil spectrum of 14 MeV neutrons. For pulsed irradiation, we discuss the manner in which damage accumulates depending on temperature and pulse rate. At low temperature, we show that there is no significant difference between pulsed and continuous irradiation when the integrated dose rate is the same. (C) 2000 Elsevier Science B.V. All rights reserved.