Deuterium depth profiling in JT-60U W-shaped divertor tiles by nuclear reaction analysis
Deuterium depth profiling in JT-60U W-shaped divertor tiles by nuclear reaction analysis
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DOI：
10.1016/j.jnucmat.2005.06.019
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发表时间：
2006-02
影响因子：
3.1
通讯作者：
T. Hayashi;K. Ochiai;K. Masaki;Y. Gotoh;C. Kutsukake-;T. Arai;T. Nishitani;N. Miya
中科院分区：
文献类型：
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作者：
T. Hayashi;K. Ochiai;K. Masaki;Y. Gotoh;C. Kutsukake-;T. Arai;T. Nishitani;N. Miya
用核反应分析（NRA）方法研究了日本原子力研究所（JAERI）托卡马克60升级装置（JT-60 U）偏滤器中面向等离子体石墨瓦的氘浓度和深度分布。氘浓度最高的D/12 C为0.053，发现在外部圆顶机翼瓦片，那里的氘积累可能通过氘-碳共沉积。在外偏滤器靶瓦和内偏滤器靶瓦中，D/12 C数据低于0.006。此外，根据NRA和二次离子质谱（西姆斯）的结果，圆顶瓦片中的最大（H+D）/12 C估计为0.023。轨道跟踪蒙特-卡罗（OFMC）模拟结果表明，中性束注入（NBI）产生的高能氘核注入到高热流密度的整流罩区域。此外，表面温度和沉积、侵蚀等条件对氘的积累过程有显著影响。氘的深度分布、扫描电子显微镜（SEM）观察和OFMC模拟表明，氘的积累主要通过三个过程：氘碳共沉积、含能氘的注入和氘向体相的扩散。
Deuterium concentrations and depth profiles in plasma-facing graphite tiles used in the divertor of JAERI Tokamak-60 Upgrade (JT-60U) were investigated by nuclear reaction analysis (NRA). The highest deuterium concentration of D/12C of 0.053 was found in the outer dome wing tile, where the deuterium accumulated probably through the deuterium–carbon co-deposition. In the outer and inner divertor target tiles, the D/12C data were lower than 0.006. Additionally, the maximum (H+D)/12C in the dome top tile was estimated to be 0.023 from the results of NRA and secondary ion mass spectroscopy (SIMS). Orbit following Monte-Carlo (OFMC) simulation showed energetic deuterons caused by neutral beam injections (NBI) were implanted into the dome region with high heat flux. Furthermore, the surface temperature and conditions such as deposition and erosion significantly influenced the accumulation process of deuterium. The deuterium depth profile, scanning electron microscope (SEM) observation and OFMC simulation indicated the deuterium was considered to accumulate through three processes: the deuterium–carbon co-deposition, the implantation of energetic deuterons and the deuterium diffusion into the bulk.