Disentangling the emissions of highly ionized tungsten in the range 4–14 nm
Disentangling the emissions of highly ionized tungsten in the range 4–14 nm
复制标题
DOI：
10.1088/0953-4075/38/16/017
复制
发表时间：
2005-08
期刊：
影响因子：
--
通讯作者：
T. Pütterich;R. Neu;C. Biedermann;R. Radtke
中科院分区：
文献类型：
--
作者：
T. Pütterich;R. Neu;C. Biedermann;R. Radtke
在这项工作中，EBIT测量的光谱范围为4-7 nm，电子能量从0.7 keV到4 keV的详细比较与托卡马克光谱从ASDEX升级。的能量和温度依赖性的光谱线和功能进行了研究和识别的电荷状态W39+-W 45+的光谱线之间的4.5 nm和6.5 nm是可能的，通过采取截面从原子数据产生的平面波玻恩计算通过科万代码。在12-14 nm的范围内，即使没有EBIT测量，钨发射的光谱线的识别也得到了改善，因为特殊的托卡马克放电为分析提供了理想的可能性。这些放电显示的光谱是由一个小区域的电子温度范围窄的排放占主导地位。因此，只有非常少的离子状态的排放作出贡献，在通常的情况下，在托卡马克光谱中的大量的离子状态的排放叠加。用不同电子温度的托卡马克谱研究了离子态W27 ~+-W35 ~+发射的5 nm准连续体特征与EBIT谱的相关性。我们的结论是，在EBIT谱在一定的电子束能量较窄的功能的结果从共存的离子状态的数量较少。
In this work EBIT measurements in the spectral range of 4–7 nm with electron energies from 0.7 keV to 4 keV are compared in detail with tokamak spectra from ASDEX Upgrade. The energy and temperature dependence of spectral lines and features are investigated and an identification of the charge states W39+–W45+ for spectral lines between 4.5 nm and 6.5 nm is possible by taking cross sections from atomic data produced by plane-wave Born calculations via the Cowan code. In the range 12–14 nm the identification of spectral lines emitted by tungsten is improved even though no EBIT measurements are available, as special tokamak discharges have provided ideal possibilities for analysis. These discharges show spectra which are dominated by the emissions from a small region with a narrow electron temperature range. Therefore, only very few ion states contribute to the emission in contrast to the usual case where in the tokamak spectra the emissions of a larger number of ion states are superimposed. Tokamak spectra for varying electron temperature are also used to investigate the correlation to EBIT spectra for the quasicontinuum feature at 5 nm which is emitted by ion states W27+–W35+. We conclude that the narrower features in the EBIT spectra at a certain electron beam energy result from the smaller number of coexisting ion states.