氚增殖包层对CFETR纵场波纹度的影响研究

Effect of tritium breeder blanket on longitudinal waviness of CFETR

氚增殖包层作为中国聚变工程实验堆的核心部件之一,其主要功能是实现氚增殖,为聚变反应提供氚燃料。由于聚变反应产生的中子会使材料活化,因此,CFETR氚增殖包层采用低活化钢作为结构材料。低活化钢材料的铁磁特性会使等离子体区域产生磁场绕动影响装置等离子体运行的稳定性。针对CFETR装置开展纵场波纹度的研究,建立了磁场分析的有限元模型,计算了F28H、CLF-1等低活化钢的波纹度分布,得到了不同结构材料的磁场强度和波纹度大小,结果显示,磁饱和值较低的结构材料有利于降低磁场波纹度。本研究可以为后续包层材料的选择与优化提供一定的参考。

Tritium breeder blanket is one of the core components of CFETR.Its main function is to realize tritium breeder and provide tritium fuel for fusion reaction.In view of the fact that the neutrons produced by the fusion reaction of deuterium and tritium will activate the material,the low activation steel is used as the structural material for the tritium breeder blanket of CFETR.Due to the ferromagnetic properties of low activation steel,the magnetic field will be introduced,which will affect the stable operation of the device.Firstly,the distribution of waviness in the center plane of different ferromagnetic materials is analyzed,and the magnetic field intensity and waviness at different positions under the influence of different ferromagnetic materials are obtained.The results show that the waviness of F28H,CLF-1 exceeds the design limit,but the material with low magnetic saturation value is beneficial to reduce the waviness.This study can provide some data support for material selection and structure optimization of tritium breeder blanket design.