Simultaneous imaging diagnostics at two layers of the edge region of the fusion plasma for studying edge instabilities.

采用两层同时成像诊断方法研究了磁约束聚变等离子体的边缘区域。一种是使用可见光，另一种是使用VUV光。通过对真空紫外光诊断技术的改进，实现了高达6 k帧/秒的高频测量。在边缘局域模研究中，观察到极向模数m=2的磁表面变形。形变的相位固定在局部磁弱位置。在通量表面的修改之后，已经观察到等离子体片从变形位置的排出。

Edge region of the magnetically confined fusion plasma is studied by the simultaneous two imaging diagnostics at two layers. One is using visible light and the other is using VUV light. By the improvement of the diagnostics for VUV light, measurement with higher frequency, up to 6k frame /sec has been achieved. In the edge localized mode study, deformation of the magnetic surface with poloidal mode number of m=2 has been observed. The phase of the deformation is fixed to the locally magnetic week location. After the modification of the flux surface, expulsion of the plasma piece has been observed from the deformed position has been observed.