Multi-species effects in magnetically driven implosions

用强磁场内爆重氚燃料是最有前途的聚变能源概念之一。然而，要使其实用化，需要了解与密集和磁化的等离子体状态相关的微观和宏观物理。特别是，既具有实际重要性又具有尚不清楚的基本方面的主题是与燃烧的等离子体核心中存在的多离子物种相关的一组效应。内爆过程中不可避免地产生的强梯度会使D离子和T离子分离，导致产额下降。这是同样的，离子间的扩散过程，负责燃烧的等离子体外围和反应堆壁之间的混合。这种混合之后，可能是壁源的高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，以解决与燃烧的磁化等离子体中存在的多种离子有关的尚未探索的影响。首先，进行动力学计算，以阐明磁场对离子扩散和其他输运过程的影响的基本原理。其次，输运系数将在氢程序中实现，以评估实际后果，如杂质扩散到燃烧核心和D和T组分分离，导致产量下降。

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.