基于SRIM程序两种模式计算石墨在离子辐照下的损伤程度  

Calculation of damage degree of graphite under ion irradiation based on two models of SRIM program

作　　者：戴智博 杜静宜 周敏 刘洪波[1] 杨腾飞 申克 Dai Zhi-bo;Du Jing-yi;Zhou Min;Liu Hong-bo;Yang Teng-fei;Shen Ke(College of Materials Science and Engineering,Hunan University,Hunan Changsha 410082,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《炭素技术》2021年第4期25-30,共6页Carbon Techniques

基　　金：国家自然科学基金(51872083)。

摘　　要：石墨材料的辐照损伤一直是核石墨研发的主要问题,目前对其辐照损伤程度的准确计算仍缺乏系统的研究。SRIM程序可模拟离子束辐照靶材料,常用来计算辐照损伤程度的定量指标dpa(displacements per atom)。本研究利用SRIM进行离子注入石墨的模拟,选取常用的K-P模式与Full Cascade模式,通过改变入射离子的质量和能量,探究了两种模式下dpa计算结果的规律及差异,并与Fe靶的计算结果作了对比。结果表明,SRIM程序两种模式之间的差异与入射离子的质量有关,随着入射离子质量的增加,两种模式之间的差异降低,与Fe靶中计算的变化趋势相反;无论是C靶还是Fe靶,两种模式之间的差异与入射离子的能量无关。The radiation damage of graphite materials has always been the main problem in the research and development of nuclear graphite, but there is still a lack of systematic research on the accurate calculation of the radiation damage degree. SRIM program can simulate the target material irradiated by ion beam, and is often used to calculate the quantitative index dpa(displacements per atom) of radiation damage degree. In this study, SRIM is used to simulate the ion implantation into graphite. The commonly used KP mode and Full Cascade mode are selected. By changing the mass and energy of the incident ion, the rules and differences of dpa calculation results under the two modes are explored, and compared with the calculation results of Fe target. The results show that the difference between the two modes of SRIM program is related to the mass of the incident ion. With the increase of the mass of the incident ion, the difference between the two modes decreases, contrary to the change trend calculated in the Fe target;whether it is C target or Fe target, the difference between the two modes has nothing to do with the energy of the incident ion.

关 键 词：石墨辐照损伤 SRIM K-P Full Cascade dpa 

分 类 号：TL342[核科学技术—核技术及应用]