束流终端大尺寸膜窗的研制  

Development of Large-Sized Window of Heavy Ion Accelerator Used As Cancer Therapy Terminal

作　　者：蒙峻[1] 张军辉[1] 杨伟顺[1] 罗成[1] 杨晓天[1] 马向利[1] 白峰[1] 郭迪舟[1] 聂增森[1] 牛志伟[1] 楼美玲[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000

出　　处：《真空科学与技术学报》2012年第1期59-62,共4页Chinese Journal of Vacuum Science and Technology

基　　金：中国科学院知识创新工程重大项目(No.KJCX1-YW-004)

摘　　要：膜窗系统是重离子束流治癌装置中隔离大气和真空的重要系统。通过应力分析,选择高强度膜(Hostaphon)和加强纤维衬底(Kevlar)联合使用,既可以使束流通过,同时中子产额少,还可以承受大气压力。采用双层真空结构,消除膜材料的漏气效应,使与膜窗相连的主系统真空度达到了10-6Pa。The large-sized window of the heavy ion accelerator,dedicated to the cancer therapy terminal,was designed and constructed.The impacts of the structures and materials of the window on the characteristics of the carbon ion beam were evaluated.The window consists of the double-layered polymer sheets,secured separately on the frame of the rectangular-structured flange： the outside is a high-strength Hostaphon polymer sheet,and the inner one is a Kevlar49 reinforced faber-woven sheet.The mechanical properties of the double-layered polymer sheets were modeled and simulated in finite element method（FEM） with the software package ANSYS,to optimize the thickness and separation between the two sheets.The test results show that the window has fairly a high ion transmission coefficient and a low leak rate,and that the pressure in the main vacuum chamber can be kept to below 10-6 Pa.In addition,few neutrons were produced.

关 键 词：重离子治癌 大尺寸膜窗 膜窗材料 应力分析 双层真空结构 

分 类 号：TB751[一般工业技术—真空技术] TB125[理学—工程力学]