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Monte Carlo modeling on primary damage generation induced by ions in solid materials   YAN Qiang1, WU Chenbin1, and LI Wei1   1. College of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, PR China (yankang84@126.com)   Abstract: Monte Carlo modeling on the interaction between ions and amorphous solid materials and the primary damage generation is presented in this paper. Based on BCA (Binary Collision Assumption), the movement of ions in materials is divided into straight segments and modeled by single elastic scattering event and continuum electronic energy loss. To deal with the elastic scattering under screened Coulomb potential, geometrical treatment in Center of Mass System is used to get scattering angle and energy transfer. The energy lost by excitation and ionization of target atoms is approximated by continuum electronic stopping power, estimated by two kinds of models based on fitting expression of experimental data. Using the implementation of collision treatment and electronic stopping power, Mersenne-Twister-algorithm-based random number generator and simple OpenGL-based visualization tool, a whole set of simulation code is established. By applying this code, trajectories and primary displacement damage were simulated and analyzed. Results showed good agreement compared with SRIM (Stopping and Range of Ions in Mater) code. Due to much better flexibility of the code presented here, the PKA spectrum, the 3-D distribution of defects and time information of PKA (Primary Knock-on Atoms) are investigated, which are not accessible using SRIM code. The code was integrated to Deeper (Damage creation and particle transport in matter) code and can serve as the primary damage generator of Multi-Scale modeling of radiation damage. Keyword: Monte Carlo modeling; ion radiation; radiation damage; multi-scale modeling
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