Abstract Hydrogen isotope retention and chemical state for the tiles exposed to plasma in the JET–ITER-like wall (ILW) during two campaigns in 2011–2012 (first campaign, ILW-1) and 2015–2016 (third campaign, ILW-3) were studied and compared by means of X-ray photoelectron spectroscopy and thermal desorption spectroscopy. In both campaigns the upper part of the inner divertor tiles was the deposition-dominated area, while erosion was observed on the outer divertor tiles. Therefore, higher deuterium retention was found on the inner divertor tiles. The major D desorption peak for the inner divertor tiles from ILW-3 was located at the temperature range of 470°C to 520°C, which was higher than measured after ILW-1: 370°C to 430°C. The XPS analyses showed the formation of a BeO layer on the ILW-3 inner divertor tiles, while after ILW-1 the layers also contained a significant amount of carbon. Deuterium retention was reduced toward the outer divertor tiles. The differences could be related to the difference in the power level in the two campaigns.

中文翻译：

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2011-2012 年和 2015-2016 年 JET 导流板与类 ITER 壁面跟踪运动的氢同位素保留量比较

摘要 在 2011-2012 年（第一次活动，ILW-1）和 2015-2016 年（第三次活动，ILW-3 ) 通过 X 射线光电子能谱和热解吸能谱进行研究和比较。在这两个运动中，内部偏滤器瓦的上部是沉积主导区域，而在外部偏滤器瓦上观察到侵蚀。因此，在内部偏滤器瓦片上发现了更高的氘保留量。来自 ILW-3 的内部偏滤器瓦的主要 D 解吸峰位于 470°C 至 520°C 的温度范围内，高于 ILW-1 之后的测量值：370°C 至 430°C。XPS 分析表明在 ILW-3 内偏滤器瓦上形成了 BeO 层，而在 ILW-1 之后，这些层也含有大量的碳。向外偏滤器砖的氘保留减少。这种差异可能与两个运动中的功率水平差异有关。