Study of high density plasmoid dynamics by high speed imaging spectroscopy measurement

为了研究固体氢燃料向核聚变反应堆堆芯燃料注入过程中芯块等离子体团动力学的物理特性，利用高速成像光谱技术对芯块等离子体团内部分布进行了测量。在该光谱系统中，使用了具有五个臂的光纤示波器。研究了等离子体团中电子密度分布的时间依赖性。比较了不同背景等离子体下等离子体团中的电子密度。内测量结果有助于对弹丸烧蚀机理的理解。

To investigate the physics of pellet plasmoid dynamics for the establishment of solid hydrogen pellet refuelling towards a nuclear fusion reactor, internal distribution measurements in the plasmoid by high-speed imaging spectroscopy have been successfully developed. In this spectroscopic system, a fiber scope with five-arms is used. The time dependence of electron density distribution in the plasmoid is investigated. The electron density in the plasmoid is compared at different background plasmas. The observations by the internal measurements contribute to the understanding of pellet ablation mechanism.