Laboratory measurements of resistivity in warm dense plasmas relevant to the microphysics of brown dwarfs.
Laboratory measurements of resistivity in warm dense plasmas relevant to the microphysics of brown dwarfs.
复制标题
与棕矮星微观物理相关的热致密等离子体电阻率的实验室测量
DOI：
10.1038/ncomms9742
复制
发表时间：
2015-11-06
影响因子：
16.6
通讯作者：
Woolsey NC
中科院分区：
文献类型：
--
作者：
Booth N;Robinson AP;Hakel P;Clarke RJ;Dance RJ;Doria D;Gizzi LA;Gregori G;Koester P;Labate L;Levato T;Li B;Makita M;Mancini RC;Pasley J;Rajeev PP;Riley D;Wagenaars E;Waugh JN;Woolsey NC
自从1995年观测到第一颗棕矮星以来，大量的研究使人们对这些天体的结构有了更好的了解。在这里，我们提出了一种在实验室中研究热致密等离子体中材料电阻率的方法，我们通过粘性和电子碰撞与棕矮星的微观物理联系起来。在这里，我们使用X射线偏振仪来测量用超强激光加热到棕矮星条件下的硫掺杂塑料靶的电阻率。通过将等离子体物理模型与测量的大的、正的、极化的原子物理计算相匹配来确定电阻率。推测的电阻率比使用标准电阻率模型预测的要大，这表明这些常用的模型不能很好地描述与棕矮星粘性有关的温密等离子体的电阻率。
Since the observation of the first brown dwarf in 1995, numerous studies have led to a better understanding of the structures of these objects. Here we present a method for studying material resistivity in warm dense plasmas in the laboratory, which we relate to the microphysics of brown dwarfs through viscosity and electron collisions. Here we use X-ray polarimetry to determine the resistivity of a sulphur-doped plastic target heated to Brown Dwarf conditions by an ultra-intense laser. The resistivity is determined by matching the plasma physics model to the atomic physics calculations of the measured large, positive, polarization. The inferred resistivity is larger than predicted using standard resistivity models, suggesting that these commonly used models will not adequately describe the resistivity of warm dense plasma related to the viscosity of brown dwarfs.