Micro-/nano-characterization of the surface structures on the divertor tiles from JET ITER-like wall
Micro-/nano-characterization of the surface structures on the divertor tiles from JET ITER-like wall
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DOI：
10.1016/j.fusengdes.2017.01.002
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发表时间：
2017-03
影响因子：
1.7
通讯作者：
M. Tokitani;M. Miyamoto;S. Masuzaki;Y. Fujii;R. Sakamoto;Y. Oya;Y. Hatano;T. Otsuka;M. Oyaidzu;H. Kurotaki;T. Suzuki;D. Hamaguchi;K. Isobe;N. Asakura;A. Widdowson;M. Rubel
中科院分区：
文献类型：
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作者：
M. Tokitani;M. Miyamoto;S. Masuzaki;Y. Fujii;R. Sakamoto;Y. Oya;Y. Hatano;T. Otsuka;M. Oyaidzu;H. Kurotaki;T. Suzuki;D. Hamaguchi;K. Isobe;N. Asakura;A. Widdowson;M. Rubel
研究了具有ITER样壁的喷气托卡马克(JET ILW)第一阶段(2011-2012)所用偏滤器瓦片表面结构的微纳表征。所分析的瓷砖是瓷砖数量为1、3和4的单个极向截面，即分别是上部目标、垂直目标和水平目标。瓷砖1围裙上的一块样品以沉积为主。在原涂层上沉积了由Be、W、Ni、O和C组成的层状混合材料层。它们的总厚度为∼1.5xμm。通过透射电子显微镜，在该层中发现了尺寸大于100x nm的纳米级泡状结构。这可能与以Be为主的岩层中的氚滞留有关。Tile 4样品的表面微结构也表现为沉积：总厚度为200-300 nm的层状混合材料层。用透射电子显微镜观察到的电子衍射图表明，膜层中含有Be。目前还没有发现气泡状结构。瓷砖3的表面原来涂有钼，被确定为冲蚀区。这与等离子体操作期间击点通常位于该瓷砖上的事实相一致。研究揭示了喷射ILW内瓦表面的微纳尺度改性。特别是，复杂的混合物质沉积层可能会影响氢同位素保留和粉尘形成。
Micro-/nano-characterization of the surface structures on the divertor tiles used in the first campaign (2011–2012) of the JET tokamak with the ITER-like wall (JET ILW) were studied. The analyzed tiles were a single poloidal section of the tile numbers of 1, 3 and 4, i.e., upper, vertical and horizontal targets, respectively. A sample from the apron of Tile 1 was deposition-dominated. Stratified mixed-material layers composed of Be, W, Ni, O and C were deposited on the original W-coating. Their total thickness was ∼1.5 μm. By means of transmission electron microscopy, nano-size bubble-like structures with a size of more than 100 nm were identified in that layer. They could be related to deuterium retention in the layer dominated by Be. The surface microstructure of the sample from Tile 4 also showed deposition: a stratified mixed-material layer with the total thickness of 200–300 nm. The electron diffraction pattern obtained with transmission electron microscope indicated Be was included in the layer. No bubble-like structures have been identified. The surface of Tile 3, originally coated by Mo, was identified as the erosion zone. This is consistent with the fact that the strike point was often located on that tile during the plasma operation. The study revealed the micro- and nano-scale modification of the inner tile surface of the JET ILW. In particular, a complex mixed-material deposition layer could affect hydrogen isotope retention and dust formation.