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Internal tests and improvements of the Krook model for nonlocal electron energy transport in laser produced plasmas

机译:激光产生等离子体中非局部电子能量传输的Krook模型的内部测试和改进

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Electron thermal transport in a laser produced plasma cannot be described with a local approximation in many regions of a laser produced plasma because the electron mean free path is longer than the temperature gradient scale length. Since a Krook model for the electron Vlasov equation is analytically solvable in the nonlocal limit, one can find simple expressions for the electron thermal flux in the nonlocal limit, and these can be economically incorporated into fluid simulations. The Krook model provides reasonable descriptions of both preheat and flux limitation. We have analyzed the Krook model in a series of publications. Here we streamline the presentation of the model, show qualitatively just what the model predicts in certain situations, give internal tests to check the validity of the model, and provide more accurate analytic approximations to the integral formulas which the model gives rise to.
机译:激光产生的等离子体中的电子热传输无法在激光产生的等离子体的许多区域中进行局部近似描述,因为电子平均自由程长于温度梯度标度长度。由于用于电子Vlasov方程的Krook模型在非局部极限中可解析地求解,因此可以在非局部极限中找到电子热通量的简单表达式,并将这些表达式经济地合并到流体模拟中。 Krook模型提供了对预热和通量限制的合理描述。我们已经在一系列出版物中分析了Krook模型。在这里,我们简化了模型的表示,定性地显示了模型在某些情况下的预测,进行了内部测试以检查模型的有效性,并对模型产生的积分公式提供更准确的解析近似。

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