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Effects of Mild Baking on Hydrogen Removal from the Modified Surface of the First Wall in the LHD

机译:轻度烘烤对LHD第一壁改性表面脱氢的影响

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An additional deuterium irradiation was performed for long-term samples mounted on the first wall in the large helical device (LHD) to investigate the effect of mild baking (at 368 K) on fuel hydrogen removal from the modified surface. The efficiency of baking strongly depended on the surface conditions. In the erosion dominant area, almost all the retained deuterium was removed by baking, whereas only 17% and 13% of the retained deuterium were removed from the boron and carbon deposition areas, respectively. The results suggest that the erosion dominant area in the first wall can act as a pumping wall during the main discharge, and, in contrast, the fuel hydrogen retention can continuously increase in boron and carbon deposition areas owing to the low removal efficiency of fuel hydrogen given that the deposition continues during the plasma discharge.
机译:对安装在大型螺旋装置(LHD)第一壁上的长期样品进行了额外的氘辐照,以研究轻度烘烤(368 K)对从改性表面去除燃料氢的影响。烘烤效率很大程度上取决于表面条件。在侵蚀占优势的区域,几乎所有残留的氘都通过烘烤除去,而分别只有17%和13%的氘从硼和碳沉积区域除去。结果表明,在主放电过程中,第一壁的腐蚀占优势区域可作为泵壁,相反,由于燃料氢的去除效率低,燃料氢的保留在硼和碳沉积区域中可以连续增加考虑到在等离子体放电期间沉积继续进行。

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