We have performed multipoint measurements with segmented electrodes and a microwave interferometer in the linear plasma device NAGDIS-II, in order to reveal cross-field motion and axial localization of the enhanced radial transport in the detached plasma. By changing the neutral pressure successively and applying several statistical analysis techniques, it was clarified that there is axially localized ion flux broadening accompanying an enhanced plasma ejection from the center with radially elongated spiraling structure. The spiraling plasma ejection accompanies the m = 0 mode drop near the center with the similar time scale. Further, such behavior composed of f > 1 kHz fluctuations is modulated by several-hundred-hertz fluctuation with m = 0. This cross-field transport causes non-negligible effect for the reduction of the ion flux peak in the detached plasma.
我们在线性等离子体装置NAGDIS-II中，利用分段电极和微波干涉仪进行了多点测量，以揭示脱靶等离子体中增强的径向输运的横向场运动和轴向局域化。通过连续改变中性气压并应用多种统计分析方法，我们阐明了存在轴向局域化的离子通量增宽现象，该现象伴随着从中心区域发出的、具有径向拉长螺旋结构的等离子体喷射。这种螺旋状等离子体喷射伴随着近中心区域m=0模式的下降，且两者具有相似的时间尺度。此外，这种行为由频率高于1 kHz的涨落组成，并受到频率为数百赫兹的m=0模式涨落的调制。这种横向场输运对脱靶等离子体中离子通量峰值的降低产生了不可忽略的影响。