Generation of photoionized plasmas in the laboratory: Analogues to astrophysical sources
Generation of photoionized plasmas in the laboratory: Analogues to astrophysical sources
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DOI：
10.1017/s174392131900961x
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
S. White;R. Irwin;R. Warwick;G. Sarri;G. Gribakin;F. Keenan;E. Hill;S. Rose;G. Ferland;F. Wang;G. Zhao;B. Han;D. Riley
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文献类型：
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作者：
S. White;R. Irwin;R. Warwick;G. Sarri;G. Gribakin;F. Keenan;E. Hill;S. Rose;G. Ferland;F. Wang;G. Zhao;B. Han;D. Riley
摘要利用窄带X射线发射的明亮光源实现了一种新的实验方法，使得能够产生与天体物理模拟程序(如Cloudy)相关的光致电离Ar等离子体。结果表明，用火神激光产生的电离参数ζ=4πF/Ne为≈50erg cm S−1，比以前用更强的装置测得的结果要高。文中还给出了在不同初始气体压力下，我们的4.15-4.25？范围内的Ar发射线光谱与Cloudy程序和一个简单的含时程序的预测结果的比较。最后，我们将简要讨论如何将这个原理验证实验扩展到更大的设备，如猎户座，以生产最接近光致电离等离子体的实验室类似物。
Abstract Implementation of a novel experimental approach using a bright source of narrowband x-ray emission has enabled the production of a photoionized argon plasma of relevance to astrophysical modelling codes such as Cloudy. We present results showing that the photoionization parameter ζ = 4πF/ne generated using the VULCAN laser was ≈ 50 erg cm s−1, higher than those obtained previously with more powerful facilities. Comparison of our argon emission-line spectra in the 4.15 - 4.25 Å range at varying initial gas pressures with predictions from the Cloudy code and a simple time-dependent code are also presented. Finally we briefly discuss how this proof-of-principle experiment may be scaled to larger facilities such as ORION to produce the closest laboratory analogue to a photoionized plasma.