Temperature measurements of shocked silica aerogel foam.
Temperature measurements of shocked silica aerogel foam.
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DOI：
10.1103/physreve.90.033107
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发表时间：
2014-09
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影响因子：
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通讯作者：
K. Falk;C. A. McCoy;Chris L. Fryer;C. Greeff;A. Hungerford;D. Montgomery;D. Schmidt;D. Sheppard;J. Williams;T. Boehly;J. Benage
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文献类型：
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作者：
K. Falk;C. A. McCoy;Chris L. Fryer;C. Greeff;A. Hungerford;D. Montgomery;D. Schmidt;D. Sheppard;J. Williams;T. Boehly;J. Benage
本文介绍了在OMEGA激光设备上对激波二氧化硅（SiO_{2}）气凝胶泡沫进行状态方程（EOS）测量的最新结果。二氧化硅气凝胶是一种重要的低密度压力标准，用于许多高能量密度实验，包括新的冲击和释放技术。由于它的许多应用，它已经被大量研究的材料，并有一个著名的Hugoniot曲线。然后，这项工作用额外的温度数据补充了速度和压力测量，提供了在温度区间为1-15 eV、冲击速度在10至40 km/s之间、冲击压力为0.3-2 Mbar的温暖致密物质区域内的完整EOS信息。实验结果与流体力学模拟和EOS模型进行了比较。我们发现测得的温度有系统地低于理论计算的结果。模拟提供了一种可能的解释，即光学热法测量的发射来自辐射前体而不是来自激波前沿，这可能对此类测量具有重要意义。
We present recent results of equation-of-state (EOS) measurements of shocked silica (SiO_{2}) aerogel foam at the OMEGA laser facility. Silica aerogel is an important low-density pressure standard used in many high energy density experiments, including the novel technique of shock and release. Due to its many applications, it has been a heavily studied material and has a well-known Hugoniot curve. This work then complements the velocity and pressure measurements with additional temperature data providing the full EOS information within the warm dense matter regime for the temperature interval of 1-15 eV and shock velocities between 10 and 40 km/s corresponding to shock pressures of 0.3-2 Mbar. The experimental results were compared with hydrodynamic simulations and EOS models. We found that the measured temperature was systematically lower than suggested by theoretical calculations. Simulations provide a possible explanation that the emission measured by optical pyrometry comes from a radiative precursor rather than from the shock front, which could have important implications for such measurements.