剥离膜安装与空气动力学分析

Stripper foil installation and aerodynamics analysis

在散裂中子源注入系统工作过程中,剥离膜是实现负氢离子转换为质子注入加速的关键部件。百nm到μm级厚度的剥离膜超薄易碎,安装及系统真空获得难度较高,一直是散裂中子源研究的重点。对比了国外膜片固定方式现状,通过设计剥离膜辅助安装装置,实现剥离膜样品批量安装;通过Fluent仿真分析,模拟得出膜片在不同进出口压差下真空获得过程中的压力分布、膜片附件空气扰动及系统空气流动,制定在不破坏剥离膜的前提下真空获得方案,并获得剥离膜系统超高真空环境。

In the operation process of spallation neutron source injection system,the stripper foil is the key equipment to realize the conversion of negative hydrogen ions into proton injection.The nanometer to micrometer thick stripper foil is ultra-thin and fragile,and its installation and system vacuum attainment are much difficult,which is the focus of spallation neutron source research.This paper compares the present situation of the foils fixation with that of the foreign foils.The pressure distribution of the foil,as well as the pressure distribution of the diaphragm under different pressure difference between inlet and outlet,air disturbance around the foil and the system air flow,has been simulated by Fluent simulation.Finally,this paper gives a vacuum solution without sacrificing the stripper foil,which has obtained an ultrahigh vacuum environment for the system.