Effect of neutral hydrogen on edge impurity behavior in stochastic magnetic field layer of Large Helical Device
Effect of neutral hydrogen on edge impurity behavior in stochastic magnetic field layer of Large Helical Device
复制标题
DOI：
10.1016/j.jnucmat.2014.12.055
复制
发表时间：
2015-08
影响因子：
3.1
通讯作者：
S. Morita;M. Kobayashi;T. Oishi;Hongming Zhang;M. Goto;Z. Cui;C. Dong;L. Hu;Xianli Huang;G. Kawamura;S. Masuzaki;I. Murakami;E. Wang
中科院分区：
文献类型：
--
作者：
S. Morita;M. Kobayashi;T. Oishi;Hongming Zhang;M. Goto;Z. Cui;C. Dong;L. Hu;Xianli Huang;G. Kawamura;S. Masuzaki;I. Murakami;E. Wang
为了研究具有三维结构的随机磁场层中的边缘杂质输运，在大型螺旋装置（LHD）上利用二维极紫外光谱测量了杂质线发射的二维分布。环形等离子体内外两侧的两个ox点附近的杂质行为可以用二维测量分别检测。结果发现，当等离子体轴从rax = 3.6 m移动到3.75 m时，碳的位置从内侧x点变化到外侧x点。采用EMC3-EIRENE代码进行三维仿真，结果与atRax= 3.75 m一致，与atRax= 3.60 m不一致。当考虑了局域在内侧的中性氢的影响，可以改变密度梯度和沿磁场方向的摩擦力时，测量值与模拟值atRax= 3.60 m之间的差异大大减小。
Two-dimensional (2-D) distribution of impurity line emissions has been measured with 2-D extreme ultraviolet (EUV) spectroscopy in Large Helical Device (LHD) for studying the edge impurity transport in stochastic magnetic field layer with three-dimensional (3-D) structure. The impurity behavior in the vicinity of twoX-points at inboard and outboard sides of the toroidal plasma can be separately examined with the 2-D measurement. As a result, it is found that the carbon location changes from inboard to outboardX-points when the plasma axis is shifted fromRax= 3.6 m to 3.75 m.A3-D simulation with EMC3-EIRENE code agrees with the result atRax= 3.75 m but disagreed with the result atRax= 3.60 m. The discrepancy between the measurement and simulation atRax= 3.60 m is considerably reduced when an effect of neutral hydrogen localized in the inboard side is taken into account, which can modify the density gradient and friction force along the magnetic field.