Material migration studies with an ITER first wall panel proxy on EAST
Material migration studies with an ITER first wall panel proxy on EAST
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使用 ITER 第一个墙板代理在 EAST 上进行材料迁移研究
DOI：
10.1088/0029-5515/55/2/023013
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发表时间：
2015-02
期刊：
影响因子：
3.3
通讯作者：
Wang, W.Z.
中科院分区：
文献类型：
--
作者：
Stangeby, P.C.;Wampler, W.R.;Wang, H.Q.;Wang, W.Z.
ITER铍（Be）第一壁（FW）面板的形状可以保护相邻面板之间因装配公差而产生的前缘。这种偏离完美的圆柱形表面自动导致磁阴影区域，其中侵蚀的Be可以再沉积，以及氚燃料的共沉积。为了提供一个基准的一系列的侵蚀/再沉积模拟研究ITER FW面板，专门的实验已经进行了EAST托卡马克使用专门设计的，仪表测试限制器作为代理FW面板的几何形状。碳涂层的钼板形成限制器的前表面暴露于外中平面边界等离子体的氦放电使用新的材料和等离子体评估系统（MAPES）。净侵蚀和沉积模式估计使用离子束分析，以测量暴露后整个表面的碳层厚度变化。在中平面附近发现约0.8 µm的最高侵蚀，其中表面最接近等离子体分界线。在代理壁元件上没有发现高于测量检测限的净沉积，即使在阴影区域中也是如此。测量的2D表面侵蚀分布已建模与3D Monte Carlo代码ERO，使用本地等离子体参数测量与扩散输运假设一起。实验观察到的净侵蚀和建模的侵蚀轮廓之间的良好的协议已经获得。
The ITER beryllium (Be) first wall (FW) panels are shaped to protect leading edges between neighbouring panels arising from assembly tolerances. This departure from a perfectly cylindrical surface automatically leads to magnetically shadowed regions where eroded Be can be re-deposited, together with co-deposition of tritium fuel. To provide a benchmark for a series of erosion/re-deposition simulation studies performed for the ITER FW panels, dedicated experiments have been performed on the EAST tokamak using a specially designed, instrumented test limiter acting as a proxy for the FW panel geometry. Carbon coated molybdenum plates forming the limiter front surface were exposed to the outer midplane boundary plasma of helium discharges using the new Material and Plasma Evaluation System (MAPES). Net erosion and deposition patterns are estimated using ion beam analysis to measure the carbon layer thickness variation across the surface after exposure. The highest erosion of about 0.8 µm is found near the midplane, where the surface is closest to the plasma separatrix. No net deposition above the measurement detection limit was found on the proxy wall element, even in shadowed regions. The measured 2D surface erosion distribution has been modelled with the 3D Monte Carlo code ERO, using the local plasma parameter measurements together with a diffusive transport assumption. Excellent agreement between the experimentally observed net erosion and the modelled erosion profile has been obtained.
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影响因子：
3.3
作者：
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