为了减少真空系统中残余气体分子对离子束造成的损失 ,要求重离子冷却储存环的平均工作真空度达到 3× 10 -9Pa( N2 等效压力 )。在大系统中达到如此高的真空度在我国尚属首例。围绕如何达到这个设计指标的问题 ,本文从真空系统布局、真空室材料、结构及加工焊接要求、降低材料表面出气率的措施、真空系统配置、烘烤系统设计、真空系统控制要求、真空压力分布等方面介绍了我们的设计方案 In order to reduce the loss of residual gas molecules in the vacuum system to the ion beam, the average working vacuum of the heavy ion cooling storage ring is required to reach 3 × 10 -9 Pa (N2 equivalent pressure). In the large system to achieve such a high degree of vacuum is the first case in our country. Focusing on the issue of how to achieve this design index, this paper analyzes the layout of vacuum system, vacuum chamber material, structure and welding requirements, measures to reduce the outflow rate of material surface, vacuum system configuration, baking system design, vacuum system control requirements, vacuum pressure distribution Etc. introduced our design