国家球形环实验装置（NSTX）上铜杂质的X射线光谱分析及其与Z箍缩等离子体的比较。

X-ray spectroscopy of Cu impurities on NSTX and comparison with Z-pinch plasmas.

作者信息

Safronova A S, Ouart N D, Lepson J K, Beiersdorfer P, Stratton B, Bitter M, Kantsyrev V L, Cox P G, Shlyaptseva V, Williamson K M

机构信息

University of Nevada, Reno, Nevada 89557, USA.

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10E305. doi: 10.1063/1.3478673.

DOI:10.1063/1.3478673

PMID:21034004

Abstract

X-ray spectroscopy of mid-Z metal impurities is important in the study of tokamak plasmas and may reveal potential problems if their contribution to the radiated power becomes substantial. The analysis of the data from a high-resolution x-ray and extreme ultraviolet grating spectrometer, XEUS, installed on NSTX, was performed focused on a detailed study of x-ray spectra in the range 7-18 Å. These spectra include not only commonly seen iron spectra but also copper spectra not yet employed as an NSTX plasma impurity diagnostic. In particular, the L-shell Cu spectra were modeled and predictions were made for identifying contributions from various Cu ions in different spectral bands. Also, similar spectra, but from much denser Cu plasmas produced on the UNR Z-pinch facility and collected using the convex-crystal spectrometer, were analyzed and compared with NSTX results.

摘要

中等原子序数（mid-Z）金属杂质的X射线光谱学在托卡马克等离子体研究中很重要，如果它们对辐射功率的贡献变得显著，可能会揭示潜在问题。对安装在国家球形环实验装置（NSTX）上的高分辨率X射线和极紫外光栅光谱仪（XEUS）的数据进行了分析，重点是对7 - 18埃范围内的X射线光谱进行详细研究。这些光谱不仅包括常见的铁光谱，还包括尚未用作NSTX等离子体杂质诊断的铜光谱。特别是，对L壳层铜光谱进行了建模，并对不同光谱带中各种铜离子的贡献识别进行了预测。此外，还分析了来自内布拉斯加大学林肯分校（UNR）Z箍缩装置产生的密度大得多的铜等离子体并使用凸面晶体光谱仪收集的类似光谱，并与NSTX的结果进行了比较。