Multi-species effects in magnetically driven implosions

用强磁场内爆氘氚燃料是最有前途的聚变能概念之一。然而，要使它成为现实，需要了解与致密磁化等离子体状态相关的微观和宏观物理学。特别是，具有实际重要性但基本方面尚不清楚的主题是与燃烧等离子体核心中多种离子存在相关的一组效应。内爆过程中不可避免地产生的强梯度会使D和T离子分离，导致屈服率下降。燃烧等离子体的外围和反应器壁之间的混合也是同样的种间扩散过程。这种混合，反过来，很可能接着是壁源的高z杂质渗透到燃烧中，从而导致能量损失。该项目将结合微观和宏观物理分析，以解决与燃烧磁化等离子体中多种离子存在相关的尚未探索的影响。首先，将进行动力学计算，以阐明磁场对离子扩散和其他输运过程影响的基本原理。其次，输运系数将在氢代码中实现，以评估实际后果，例如杂质扩散到燃烧核心以及D和T组分的分离，从而导致收率下降。

Imploding the deuterium-tritium fuel with strong magnetic field is one of the most promising fusion energy concepts. Yet making it practical requires understanding the micro- and macro-physics associated with the dense and magnetized plasma state. In particular, the topic of both practical importance with yet unclear fundamental aspects is the group of effects associated with the presence of multiple ion species in the burning plasma core. The strong gradients inevitably arising during the course of implosion can separate the D and T ions, resulting in the yield degradation. It is the same, inter-ion-species diffusion process that is responsible for the mix between periphery of the burning plasma and the reactor wall. This mix, in turn, is likely followed by penetration of the wall-originated high-Z impurity into the burning, thus contributing to the energy loss. This project will combine micro- and macro-physics analyses to address the yet unexplored effects associated with the presence of multiple ion species in burning magnetized plasmas. Firstly, kinetic calculation will be performed to clarify the fundamentals of the magnetic field effect on ion diffusion and other transport processes. Secondly, the transport coefficients will be implemented in a hydrocode to evaluate practical consequences, such as impurity diffusion into the burning core and separation of the D and T components, resulting in yield degradation.