Characteristics of neutron emission profile from neutral beam heated plasmas of the Large Helical Device at various magnetic field strengths
Characteristics of neutron emission profile from neutral beam heated plasmas of the Large Helical Device at various magnetic field strengths
复制标题
不同磁场强度下大型螺旋装置中性束加热等离子体中子发射剖面特征
DOI：
10.1088/1361-6587/abf575
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发表时间：
2021
影响因子：
2.2
通讯作者：
Osakabe M
中科院分区：
文献类型：
--
作者：
Ogawa K;Isobe M;Sugiyama S;Spong D A;Sangaroon S;Seki R;Nuga H;Yamaguchi H;Kamio S;Fujiwara Y;Kobayashi M I;Jo J;Osakabe M
用多视距垂直中子相机测量了大螺旋装置中氘等离子体在不同磁场强度条件下的中子发射剖面。发现在共中性束（NB）情况下，线积分中子发射谱线向外偏移，在反NB情况下向内偏移。在这里，共方向和反方向分别对应于增强和减小极向磁场方向。当磁场强度减弱时，这种变化变得更加明显。实验得到的中子发射曲线与DELTA5D程序模拟的随轨模型进行了比较。由于束流离子轨道的变化和等离子体参数的变化，计算出的中子发射谱线随磁场强度的变化而变化。虽然在较低场强条件下，co-NB情况下计算得到的舷侧剖面较窄，但计算和实验得到的剖面基本是定性一致的。
The neutron emission profile of deuterium plasma in the Large Helical Device was measured with a multi-sightline vertical neutron camera under various magnetic field strength conditions. It was found that the line-integrated neutron emission profile shifts outward in the co-neutral beam (NB) case and inward in the counter NB case. Here, co-and counter directions correspond to enhance and reduce the poloidal magnetic field directions, respectively. The shift becomes more significant when the magnetic field decreased in strength. The experimentally obtained neutron emission profile was compared with the orbit-following models simulated through the DELTA5D code. The calculated neutron emission profiles vary according to the magnetic field strength because of the change of beam ion orbit and the slowing down due to the plasma parameter changes. Although a relatively narrow profile was obtained in the calculations at the inboard side for the co-NB case in the relatively low field condition, the profiles obtained through calculation and experiment were almost qualitatively aligned.