The net erosion of material from recessed areas of the JET main chamber inner wall during the first three ITER-like wall (JET-ILW) campaigns was studied using long-term samples with Be and W marker layers. The samples were analyzed using elastic backscattering spectrometry (EBS) before and after each campaign. It was found that the erosion for both Be and W was roughly homogeneously distributed in both toroidal and poloidal directions, possibly with a small maximum near the middle of the inner wall and a minimum near the bottom of the wall, as well as several toroidal distribution features. The net erosion rate of Be decreased by a factor of two between the first and the second JET-ILW campaigns, and remained unchanged during the third JET-ILW campaign. Three possible explanations are presented: a campaign to test the power handling capability of the limiter in ILW1, a change in incident particle energy distribution, and a change in limiter to divertor discharge time ratio. The net erosion rate of W remained almost unchanged through the first two JET-ILW campaigns. In the third JET-ILW campaign the net erosion rate of W from the inner wall was about 1.6 times higher than previously observed, indicating a change in the energy spectrum of particles eroding the inner wall, and the occasional addition of Kr and Xe to the fuelling.

使用具有 Be 和 W 标记层的长期样品研究了在前三个 ITER 类壁 (JET-ILW) 活动期间来自 JET 主室内壁凹陷区域的材料的净侵蚀。在每次活动之前和之后，使用弹性背向散射光谱法 (EBS) 分析样品。发现Be和W的侵蚀在环向和极向方向上大致均匀分布，可能在内壁中部附近有一个小的最大值，在壁底附近有一个最小值，以及几个环形分布特征。Be 的净侵蚀率在第一次和第二次 JET-ILW 运动之间降低了两倍，并且在第三次 JET-ILW 运动期间保持不变。提出了三种可能的解释：测试 ILW1 中限制器的功率处理能力、入射粒子能量分布的变化以及限制器与偏滤器放电时间比的变化的活动。W 的净侵蚀率在前两次 JET-ILW 运动中几乎保持不变。在第三次 JET-ILW 活动中，W 从内壁的净侵蚀速率比之前观察到的高约 1.6 倍，表明侵蚀内壁的粒子的能谱发生了变化，并且偶尔会向内壁添加 Kr 和 Xe。加油。