Observation of EUV spectra from gadolinium and neodymium ions in the Large Helical Device
Observation of EUV spectra from gadolinium and neodymium ions in the Large Helical Device
复制标题
DOI：
10.1088/0953-4075/45/13/135002
复制
发表时间：
2012-07
期刊：
影响因子：
--
通讯作者：
C. Suzuki;F. Koike;I. Murakami;N. Tamura;S. Sudo
中科院分区：
文献类型：
--
作者：
C. Suzuki;F. Koike;I. Murakami;N. Tamura;S. Sudo
我们观察到了国家核聚变科学研究所大型螺旋装置产生的光学薄等离子体中高电荷钆和钕离子的极紫外 (EUV) 光谱。将固体颗粒注入氢等离子体后，EUV 光谱在 6-9 nm 区域的时间演变通过掠入射光谱仪以 0.2 秒的帧速率进行测量。根据电子温度观察到三种不同类型的光谱特征。当峰值电子温度约为 2 keV 时，可以识别出类 Ni 和 Cu 的钆离子和钕离子的离散谱线，而当形成不寻常的空心等离子体时，在温度低于 240 eV 的等离子体中发现了一些类银钆离子的谱线。在中间温度下，由开放 4p/4d 亚壳层离子的未解析跃迁阵列引起的准连续谱特征是主要的。
We have observed extreme ultraviolet (EUV) spectra from highly charged gadolinium and neodymium ions in optically thin plasmas produced in the Large Helical Device at the National Institute for Fusion Science. Time evolutions of EUV spectra in the 6–9 nm region following injection of a solid pellet into a hydrogen plasma were measured by a grazing incidence spectrometer with a frame rate of 0.2 s. Three different types of spectral features have been observed depending on the electron temperature. Discrete spectral lines of Ni- and Cu-like gadolinium and neodymium ions were identified when the peak electron temperature was around 2 keV, while some lines of Ag-like gadolinium ions were found in the plasma with temperatures below 240 eV when an unusual hollow plasma was formed. Under the intermediate temperature, a quasi-continuum spectral feature arising from an unresolved transition array from open 4p/4d subshell ions is predominant.