Faculty of Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA.
Phys Rev E. 2018 Jan;97(1-1):013202. doi: 10.1103/PhysRevE.97.013202.
The ion kinetic energy in a stagnating plasma was previously determined by Kroupp et al. [Phys. Rev. Lett. 107, 105001 (2011)PRLTAO0031-900710.1103/PhysRevLett.107.105001] from Doppler-dominated line shapes augmented by measurements of plasma properties and assuming a uniform-plasma model. Notably, the energy was found to be dominantly stored in hydrodynamic flow. Here we advance a new description of this stagnation as supersonically turbulent. Such turbulence implies a nonuniform density distribution. We demonstrate how to reanalyze the spectroscopic data consistent with the turbulent picture and show that this leads to better concordance of the overconstrained spectroscopic measurements, while also substantially lowering the inferred mean density.
停滞等离子体中的离子动能先前由 Kroupp 等人确定。[Phys. Rev. Lett. 107, 105001 (2011)PRLTAO0031-900710.1103/PhysRevLett.107.105001]，方法是通过对多普勒主导的谱线形状进行增强测量，并假设均匀等离子体模型。值得注意的是，研究发现能量主要存储在流体动力学流动中。在这里，我们将这种停滞描述为超音速湍流。这种湍流意味着密度分布不均匀。我们展示了如何根据湍流图像重新分析光谱数据，并表明这可以更好地协调过约束的光谱测量，同时还大大降低了推断的平均密度。
