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.

在各种磁场强度条件下，使用多视线垂直中子相机测量了大型螺旋装置中氘等离子体的中子发射剖面。发现线积分中子发射剖面在共中性束 (NB) 情况下向外移动，在反 NB 情况下向内移动。这里，同向和反向分别对应于增强和减少极向磁场方向。当磁场强度降低时，偏移变得更加显着。实验获得的中子发射剖面与通过 DELTA5D 代码模拟的轨道跟踪模型进行了比较。由于束离子轨道的变化和等离子体参数变化导致的减速，计算出的中子发射剖面根据磁场强度而变化。