聚变α粒子对第一壁辐照损伤的蒙特-卡罗研究(Ⅰ)——轰击第一壁的α粒子能谱

MONTE-CARLO STUDIES OF RADIATION DAMAGE INDUCED BY FUSION(I) a-PARTICLES AT THE FIRST-WALL

本文研究从托卡马克聚变堆等离子体边界损失的α粒子能谱。分析α粒子的损失机制。建立描述α粒子输运的慢化-扩散方程。同时考虑香蕉捕获粒子、飞行粒子和波纹约束粒子对扩散系数的贡献以及α粒子的直接损失机制。针对典型的聚变堆参数数值求解方程得到待求的α粒子能谱。讨论了解的物理意义。

This paper investigates the spectra of fusion α-particle leaking out from the plasma boundary in a Tokamak fusion reactor, bombarding the first wall. The loss mechanisms of a-particle were studied, and the slowing down-diffusion equations describing the a-particle transport in plasma were set up. The contributions from banana-trapped particles, transit panicles and superbanana ripple trapped particles to the diffusion coefficient were included in the study. The equations were numerically solved for Tokamak reactors with typical parameters to obtain the required a-particle spectra. The physical significance of the results is discussed finally.