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Theoretical Simulations of Irradiation-Induced Sputtering at Tungsten Surface
Xue-min Hua1, Hai-yan He1, Wen-yi Ding1, Ru Ding2, Jun-ling Chen2, Bi-cai Pan1
1.Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.;2.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
Abstract:
The irradiation-induced sputtering and the structural damage at tungsten surface are investigated by using molecular dynamics simulations at the level of quantum mechanics. Our simulations indicate that the sputtered atoms appear when the energy of incident primary knock-on atom (PKA) is more than 200 eV and the incident angle of the PKA is larger than 65°. Meanwhile, the irradiation-induced vacancies are less when the incident angle of PKA is in the range of 45°-65°. So, the optimum incident angles of PKA are suggested to reduce the irradiation-induced damage of the W surface. Furthermore, we find that the interstitials contained in the systems accelerate the sputtering whereas the intrinsic vacancies suppress the sputtering when the PKA is near the defects.
Key words:  Sputtering  W surface  Plasma facing material  Tight-binding molecular dynamics simulations
FundProject:This work is supported by the National Magnetic Confinement Fusion Program (No.2013GB107004),the National Natural Science Foundation of China (No.11275191).The Computational Center of USTC is acknowledged for computational support.
辐照导致钨表面的溅射现象的理论研究
化雪敏1, 何海燕1, 丁文艺1, 丁锐2, 陈俊凌2, 潘必才1
1.中国科学技术大学物理系, 中国科学院强耦合实验室, 合肥 230026;2.中国科学院合肥物质研究院等离子物理研究所, 合肥 230026
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DOI:10.1063/1674-0068/30/cjcp1607138
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