Visible emission spectroscopy of highly charged tungsten ions in LHD: I. Survey of new visible emission lines
Visible emission spectroscopy of highly charged tungsten ions in LHD: I. Survey of new visible emission lines
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DOI：
10.1088/0031-8949/90/12/125402
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发表时间：
2015-11
期刊：
影响因子：
2.9
通讯作者：
M. Shinohara;K. Fujii;D. Kato;N. Nakamura;M. Goto;S. Morita;M. Hasuo;L. Group
中科院分区：
文献类型：
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作者：
M. Shinohara;K. Fujii;D. Kato;N. Nakamura;M. Goto;S. Morita;M. Hasuo;L. Group
我们从大型螺旋装置的核心等离子体中发现了 12 条未知的可见发射线，其中聚集了高电荷钨离子。观测采用我们自制的中阶梯光栅光谱仪，波长范围覆盖450-715 nm，两视线波长分辨率<0.05 nm；一条线同时通过核心和边缘等离子体，另一条线仅通过边缘等离子体。这些发射线归因于高电荷钨离子，因为 (1) 仅在将钨颗粒注入等离子体后才能观察到它们，(2) 仅在电子温度为 1 keV 的核心等离子体中观察到它们，(3) 它们显示的谱线展宽接近 1 keV 温度下钨离子的多普勒宽度，以及 (4) 其中一些发射线的波长接近于计算结果钨离子的电荷状态为 25-28。
We found 12 unknown visible emission lines from the core plasma of large helical device with highly charged tungsten ions accumulated. The observation was made with our home-built échelle spectrometer, which covers the wavelength range of 450–715 nm with a wavelength resolution of <0.05 nm for two lines of sight; one line passes both the core and edge plasmas and the other passes only the edge plasma. These emission lines are attributed to highly charged tungsten ions because (1) they were observed only after a tungsten pellet was injected into the plasma, (2) they were observed only from the core plasma where the electron temperature is 1 keV, (3) they show line broadenings that are close to the Doppler widths of tungsten ions with 1 keV temperature and (4) the wavelengths of some of these emission lines are close to the calculation results for tungsten ions in the charge state of 25–28.