Ida K, Inagaki S, Yoshinuma M, Narushima Y, Itoh K, Kobuchi T, Watanabe K Y, Funaba H, Sakakibara S, Morisaki T
National Institute for Fusion Sciences, Toki, Gifu 509-5292, Japan.
Phys Rev Lett. 2008 Feb 1;100(4):045003. doi: 10.1103/PhysRevLett.100.045003. Epub 2008 Jan 30.
Three states of a magnetic island are observed when the magnetic shear at the rational surface is modified using inductive current associated with the neutral beam current drive in the Large Helical Device. One state is the healed magnetic island with a zero island width. The second state is the saturated magnetic island with partial flattening of the T(e) profile. The third state is characterized by the global flattening of the T(e) profile in the core region. As the plasma assumes each of the three states consecutively through a bifurcation process a clear hysteresis in the relation between the size of the magnetic island and the magnetic shear is observed.
在大型螺旋装置中，当利用与中性束电流驱动相关的感应电流改变有理面上的磁剪切时，观测到磁岛的三种状态。一种状态是岛宽为零的愈合磁岛。第二种状态是T(e)分布部分变平的饱和磁岛。第三种状态的特征是核心区域T(e)分布整体变平。当等离子体通过分岔过程依次呈现这三种状态时，观测到磁岛大小与磁剪切之间的关系存在明显的滞后现象。
