Deuterium retention in tungsten used in ASDEX Upgrade: comparison of tokamak and laboratory studies
Deuterium retention in tungsten used in ASDEX Upgrade: comparison of tokamak and laboratory studies
复制标题
DOI：
10.1088/0031-8949/2014/t159/014043
复制
发表时间：
2014-04
期刊：
影响因子：
2.9
通讯作者：
K. Sugiyama;M. Mayer;A. Herrmann;K. Krieger;V. Rohde;M. Balden;S. Lindig;R. Neu;H. W. Müller
中科院分区：
文献类型：
--
作者：
K. Sugiyama;M. Mayer;A. Herrmann;K. Krieger;V. Rohde;M. Balden;S. Lindig;R. Neu;H. W. Müller
研究了ASDEX UPGRADE(AUG)中用作外偏滤器靶的两种钨(W)材料，即两种类型的W涂层和固体块体W中的氚(D)保留，并与实验室实验进行了比较。由于W涂层具有较高的固有缺陷密度，因此W涂层中的D浓度大于固体W中的浓度，这与实验数据一致。固体多晶-W表面没有明显的起泡，这可能是由于其表面经过工艺加工所致。D值与入射通量呈平方根关系，表明扩散限制捕获过程对D值的积累起主导作用。AUG W材料的总体保留行为在基于实验室研究的预测范围内。
Deuterium (D) retention in tungsten (W) materials, i.e. two types of W coatings and solid bulk W, used as outer divertor target in ASDEX Upgrade (AUG), was investigated and compared with laboratory experiments. The D concentration in the W coatings was larger than in solid bulk W because W coatings generally have higher inherent defect density, which is consistent with laboratory data. No clear blistering was found on the solid bulk polycrystalline-W, which could be due to its technically-machined surface. The amount of D retained in the solid bulk W tile of AUG showed a nearly square-root dependence on the incident fluence, suggesting that a diffusion-limited trapping process plays a dominant role for the D accumulation. The overall retention behaviour in AUG W materials was reasonably within the range of the predictions based on laboratory studies.