短脉冲激光加热目标光谱中的辐射传递

R. A. London, H. A. Scott, Madison E. Martin
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引用次数: 0

摘要

激光产生的等离子体中的条件经常是通过 X 射线光谱比较计算光谱和测量光谱来确定的。最常用的是低原子序数至中原子序数元素 K 壳跃迁的线光谱,因为重要的物理过程已被很好地理解,可靠的光谱可以很容易地测量和计算出来。由于强线的光学深度大,辐射传递效应会影响光谱。在这项工作中,研究了辐射传递对短激光脉冲加热目标发射光谱的影响。量化了在推断电子温度时如果不考虑辐射传递可能产生的误差。将辐射传递纳入光谱计算可提高典型温度诊断的准确性,并允许使用强谱线进行诊断。
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Radiation transfer in the spectra of short-pulse laser-heated targets
The conditions in laser-produced plasmas are frequently determined with x-ray spectroscopy by comparing calculated to measured spectra. Line spectra from K-shell transitions of low- to mid-atomic number elements are most often used since the important physical processes are well understood and reliable spectra can be readily measured and calculated. Radiation transfer effects due to large optical depths of strong lines can influence the spectra. In this work, the effects of radiation transfer on the emission spectra of short-laser pulse-heated targets are studied. The possible errors made in inferring electron temperature by not including radiation transfer are quantified. The inclusion of radiative transfer in spectral calculations improves the accuracy of typical temperature diagnostics and allows the use of strong lines for diagnostics.
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