电介质与碰撞吸收的弹道处理
Connection between the Dielectric and the Ballistic Treatment of Collisional Absorption
摘要：
在这项工作中，两个重要的模型处理激光驱动等离子体中的碰撞吸收进行了比较，电介质和弹道模型。我们将看到，这些基本方法之间存在着显著的联系，这可能会给我们一个如何克服固有局限性的提示。模型中的近似值并不相同，导致不同的优点和缺点。我们注意到，介电模型是能够处理屏蔽在一个自洽的方式，但仅限于一阶的电子-离子相互作用。弹道模型精确地计算了每个相互作用阶次的电子-离子碰撞，但必须引入一个截止值以纳入屏蔽效应。这意味着在动力学理论的背景下，电子-离子相关必须在随机相位或梯形近似中计算，或者换句话说，必须使用线性化的Lenard-Balescu或Boltzmann碰撞项。
英文摘要：
In this work two important models of treating collisional absorption in a laser driven plasma are compared, the dielectric and the ballistic model. We will see that there exists a remarkable connection between these basic approaches which could give a hint how to overcome the inherent limitations. The approximations made in the models are not identical and lead to different advantages and disadvantages. We notice that the dieletric model is able to handle screening in a selfconsistent manner, but is limited to first order in the electron-ion interaction. The ballistic model calculates the electron-ion collision exactly in each order of the interaction, but has to introduce a cut-off to incorporate screening effects. This means in the context of kinetic theory that the electron-ion correlation has to be calculated either in random phase or in ladder approximation, or, in other words, the linearized Lenard-Balescu or Boltzmann collision term has to be used.
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