Precise calculation of the electron temperature of laser-induced water scale plasma
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摘要: 为了减小谱线自发辐射跃迁几率等参量的不确定性带来的计算误差，采用一种改进型的迭代Boltzmann算法研究了激光诱导水垢等离子体的电子温度，经过12次迭代，线性相关系数由0.7687提高到0.99991，得到水垢等离子体的电子温度为5012K。Lorentz函数拟合Ca Ⅱ 393.37nm得到水垢等离子体的电子密度是5.7×1016cm-3，远高于临界值6.4×1015cm-3，证明激光诱导水垢等离子体满足局部热力学平衡模型。结果表明，本方法不仅操作简单，而且可以明显提高等离子体特征参量的求解精度。Abstract: To reduce the calculation error induced by the uncertainty of the parameters, such as spectrum spontaneous emission transition probabilities, the electron temperature of the laser-induced water scale plasma was studied using a modified iterative Boltzmann algorithm. After 12 iterations, the linear correlation coefficient was increased from 0.7687 up to 0.99991 while the electron temperature of the water scale plasma was 5012K. After the fitting of Ca Ⅱ 393.37nm by Lorentz function, the electron density of water scale plasma was 5.7×1016cm-3, much higher than the critical value of 6.4×1015cm-3. The laser-induced water scale plasma was proved to meet the local thermodynamic equilibrium model. The experimental results show that this method not only is simple, but also can improve the solution accuracy of the characteristic parameters of the plasma significantly.
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