Reconstruction of radiation profiles near the plasma boundary using an infrared imaging video bolometer in KSTAR.
Reconstruction of radiation profiles near the plasma boundary using an infrared imaging video bolometer in KSTAR.
复制标题
使用 KSTAR 中的红外成像视频测辐射热计重建等离子体边界附近的辐射剖面。
DOI：
10.1063/1.5038904
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
W. Choe
中科院分区：
文献类型：
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作者：
Juhyeok Jang;B. Peterson;Seungtae Oh;K. Mukai;Suk;W. Choe
使用层析成像反演的红外成像视频测辐射热计可以提供总辐射功率和二维辐射剖面，这是杂质播种实验的关键信息。由于等离子体边缘存在大量杂质，因此精确重建材料边界附近的辐射轮廓是一个重要问题。在本研究中，比较了两种边界条件处理方法。一种涉及在重建之前排除边界之外的等离子体像素，而另一种则在重建之后排除这些像素。使用D形和偏滤器辐射剖面进行体模重建测试，与第一种方法相比，第二种方法显示了边界重建结果的改进。使用第二种方法，重建了 KSTAR 中氪 (Kr) 种子 H 模式等离子体的辐射剖面。大量的输入功率通过氪辐射耗散。二维重建的辐射剖面表明，Kr 主要聚集在等离子体核心而不是边缘。
An infrared imaging video bolometer using tomographic inversion can provide the total radiated power and 2-D radiation profiles, which are crucial information for impurity seeding experiments. Because large amounts of impurities exist at the plasma edge, accurate reconstruction of the radiation profiles near the material boundary is an important issue. In this study, two methods of boundary condition treatment are compared. One involves the exclusion of plasma pixels outside the boundary before reconstruction, whereas the other excludes these pixels after reconstruction. Phantom reconstruction tests are performed with D-shaped and divertor radiation profiles, and the second method shows an improvement in the boundary-reconstruction results compared with the first method. Using the second method, the radiation profiles of krypton (Kr) seeded H-mode plasmas in KSTAR are reconstructed. A significant amount of input power is dissipated through the Kr radiation. The 2-D reconstructed radiation profiles show that Kr mostly accumulates at the plasma core rather than at the edge.