Observation of carbon impurity flow in the edge stochastic magnetic field layer of Large Helical Device and its impact on the edge impurity control
Observation of carbon impurity flow in the edge stochastic magnetic field layer of Large Helical Device and its impact on the edge impurity control
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DOI：
10.1088/1741-4326/aa8f63
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发表时间：
2017
期刊：
影响因子：
3.3
通讯作者：
T. Oishi;S. Morita;S. Dai;M. Kobayashi;G. Kawamura;X.L. Huang;H.M. Zhang;Y. Liu;M. Goto-M.-Go
中科院分区：
文献类型：
--
作者：
T. Oishi;S. Morita;S. Dai;M. Kobayashi;G. Kawamura;X.L. Huang;H.M. Zhang;Y. Liu;M. Goto-M.-Go
利用3 m正入射空间分辨真空紫外（VUV）光谱仪研究了大螺旋装置（LHD）边缘等离子体中随机磁场层（称为“各态历经层”）中碳杂质的平行流动。本文利用LHD水平伸长等离子体位置CIV谱线发射的二阶多普勒频移（2 × 1548.20 μ m），计算了C3+杂质流的全垂直剖面。遍历层中的顶部边缘和底部边缘处的碳流动具有沿着长径方向朝向外侧的相同方向。所观察到的流动与三维模拟程序EMC 3-EIRENE的模拟结果在定量上一致。实验验证了边缘平行流驱动杂质筛选的有效性。
The parallel flow of carbon impurity in a thick stochastic magnetic field layer called the ‘ergodic layer’ located at the edge plasma of the Large Helical Device (LHD) is studied by space-resolved vacuum ultraviolet (VUV) spectroscopy, using a 3 m normal incidence spectrometer. A full vertical profile of C3+ impurity flow is evaluated from the Doppler shift of the second order of CIV line emission (2 × 1548.20 Å) at a horizontally-elongated plasma position of LHD. The carbon flow at the top and bottom edges in the ergodic layer has the same direction toward the outboard side along the major radius direction. The observed flow quantitatively agrees with the simulation results calculated with a 3D simulation code, EMC3-EIRENE. It experimentally verifies the validity of edge parallel flow driving the impurity screening.