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Material migration studies with an ITER first wall panel proxy on EAST

机译:在IAST上使用ITER第一个墙面板代理进行材料迁移研究

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摘要

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.
机译:ITER铍(Be)第一壁(FW)面板的形状可保护相邻面板之间因装配公差而引起的前缘。这种偏离完美圆柱形表面的现象会自动导致磁阴影区域,在那里可以重新沉积侵蚀的Be以及co燃料的共沉积。为为ITER FW面板进行的一系列腐蚀/再沉积模拟研究提供基准,已使用专门设计的仪器化测试限幅器替代FAST面板几何形状,在EAST托卡马克上进行了专门的实验。使用新的材料和等离子评估系统(MAPES),将形成限制器前表面的碳涂层钼板暴露于氦气放电的外中平面边界等离子体中。使用离子束分析估算净腐蚀和沉积方式,以测量暴露后整个表面的碳层厚度变化。在表面最靠近等离子体分离层的中平面附近发现了最大的腐蚀,约为0.8μm。即使在阴影区域中,在代理墙元素上也没有发现超出测量检测极限的净沉积。使用局部等离子体参数测量值和扩散传输假设,已使用3D蒙特卡罗代码ERO对测得的2D表面侵蚀分布进行了建模。实验观察到的净侵蚀与模型化侵蚀曲线之间已取得了极好的一致性。

著录项

  • 来源
    《Nuclear fusion》 |2015年第2期|023013.1-023013.10|共10页
  • 作者单位

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    ITER Organization, Route de Vinon-.sur-Verdon, CS 90 04, 613067 St Paul Lez Durance Cedex, France;

    Institute of Energy and Climate Research-Plasma Physics, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, Trilateral Euregio Cluster, Juelich, Germany;

    ITER Organization, Route de Vinon-.sur-Verdon, CS 90 04, 613067 St Paul Lez Durance Cedex, France;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Energy and Climate Research-Plasma Physics, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, Trilateral Euregio Cluster, Juelich, Germany;

    ITER Organization, Route de Vinon-.sur-Verdon, CS 90 04, 613067 St Paul Lez Durance Cedex, France;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    University of Toronto Institute for Aerospace Studies, Toronto, M3H 5T6, Canada;

    Radiation-Solid Interactions Department 1111, Sandia National Laboratories, Albuquerque, NM USA 87185;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei, Anhui 230031, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    material migration; erosion and deposition; ITER first wall;

    机译:物质迁移;侵蚀和沉积;ITER第一墙;
  • 入库时间 2022-08-18 00:42:27

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