Transition from nonlocal electron transport to radiative regime in an expanding blast wave
Transition from nonlocal electron transport to radiative regime in an expanding blast wave
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DOI：
10.1063/1.5022698
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发表时间：
2018-06
影响因子：
4
通讯作者：
A. Marocchino;A. Ravasio;A. Lévy;L. Lancia;Y. Fukuda;S. Jinno;S. Atzeni;D. Doria;C. Prigent;E. Lamour;D. Vernhet;M. Borghesi;L. Romagnani
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作者：
A. Marocchino;A. Ravasio;A. Lévy;L. Lancia;Y. Fukuda;S. Jinno;S. Atzeni;D. Doria;C. Prigent;E. Lamour;D. Vernhet;M. Borghesi;L. Romagnani
我们研究了激光产生的圆柱形爆炸波 (BW) 的形成、演化和后期传播。通过实验（通过时间分辨干涉测量）和包括非局域电子传输和辐射扩散建模的流体动力学模拟，重建了几纳秒时间尺度上的整个爆炸波演化。实验结果与模拟结果的比较表明，早期膨胀阶段的特点是非局域电子热传输，导致能量扩散的时间短于流体动力膨胀的典型时间尺度。非局域电子传输使等离子体前沿之前的气体电离，并产生平滑的径向密度梯度。随后，一旦激波发射并形成 BW，与绝热情况相比，辐射会导致激波速度降低。这些研究提供了一个合适且有效的平台来衡量动力学和辐射的包含...
We have investigated the formation, evolution, and late-time propagation of a laser-generated cylindrical blast wave (BW). The whole blast wave evolution over timescales of several nanoseconds was reconstructed experimentally (via temporally resolved interferometric measurements) and via hydrodynamic simulations that included modeling of nonlocal electron transport and radiation diffusion. Comparison between the experimental results and the simulations indicates that the early expansion phase is characterised by nonlocal electron heat transport causing energy spread on times shorter than the typical timescales for hydrodynamic expansion. Nonlocal electron transport ionizes the gas ahead of the plasma front and gives rise to a smooth radial density gradient. At later times, once the shock is launched and the BW is formed, radiation results in reduced shock velocity compared to the adiabatic case. These investigations provide a suitable and effective platform to benchmark the inclusion of kinetic and radiat...