Detailed model for hot-dense aluminum plasmas generated by an x-ray free electron laser
Detailed model for hot-dense aluminum plasmas generated by an x-ray free electron laser
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DOI：
10.1063/1.4942540
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发表时间：
2016-02-01
影响因子：
2.2
通讯作者：
Wark, J. S.
中科院分区：
文献类型：
--
作者：
Ciricosta, O.;Vinko, S. M.;Wark, J. S.
通过用高强度飞秒X射线激光等容加热固体靶来产生热致密等离子体样品的可能性为此类系统的实验研究开辟了新的机会。对从固体密度等离子体发射的X射线光谱的研究已经提供了对X射线吸收机制、随后的靶加热以及温度、电子密度和产生的电离阶段的条件的重要洞察（Vinko等人，Nature 482，59-62（2012））。此外，对光谱的详细分析提供了关于这些强耦合等离子体中电离电势降低程度的新信息（Ciricosta等人，物理修订信函109，065002（2012））。实验光谱和模拟光谱之间已经获得了极好的一致性，但实现这一目标的过程的完整概述尚未被记录下来。我们在这里提出的细节和近似的建模实验中所描述的上述参考工作。我们表明，这是至关重要的，要考虑到在模拟整体发射光谱的空间和时间梯度，并讨论如何使用的模型方面影响的数据解释的电离电位凹陷的电荷分辨测量。(C)2016 AIP Publishing LLC.
The possibility of creating hot-dense plasma samples by isochoric heating of solid targets with high-intensity femtosecond X-ray lasers has opened up new opportunities in the experimental study of such systems. A study of the X-ray spectra emitted from solid density plasmas has provided significant insight into the X-ray absorption mechanisms, subsequent target heating, and the conditions of temperature, electron density, and ionization stages produced (Vinko et al., Nature 482, 59-62 (2012)). Furthermore, detailed analysis of the spectra has provided new information on the degree of ionization potential depression in these strongly coupled plasmas (Ciricosta et al., Phys. Rev. Lett. 109, 065002 (2012)). Excellent agreement between experimental and simulated spectra has been obtained, but a full outline of the procedure by which this has been achieved has yet to be documented. We present here the details and approximations concerning the modelling of the experiment described in the above referenced work. We show that it is crucial to take into account the spatial and temporal gradients in simulating the overall emission spectra, and discuss how aspects of the model used affect the interpretation of the data in terms of charge-resolved measurements of the ionization potential depression. (C) 2016 AIP Publishing LLC.