中国散裂中子源(CSNS)LRBT输运线真空系统

The Vacuum System of LRBT at CSNS

中国散裂中子源(CSNS)质子加速器由产生能量为80Me V的负氢离子直线加速器、直线加速器到环(LRBT)和环到靶(RTBT)的束流输运线、以及积累和加速质子束到1.6Ge V的快循环同步环(RCS)组成,而总长约200米的LRBT段是该加速器的重要组成部分。本文介绍LRBT段真空系统,包括总体布局设计,物理需求,真空参数,关键设备,安装和调试工作;目前,LRBT动态真空在打靶功率50k W时优于2×10-6Pa,满足物理需求,各非标真空设备、真空获得及测量设备等经过2年半的长期运行,稳定可靠无故障。

The proton accelerator at China Spallation Neutron Source(CSNS)consists of the negative hydrogen ion(H-)Linac with an energy of 80 MeV,the Linac to Rapid Cycling Synchrotron(RCS)Beam Transport(LRBT)and RCS to Target Beam Transport(RTBT),and the RCS that accumulates and accelerates the proton beam to 1.6 GeV.The LRBT section with a total length about 200 meters is an important part for the accelerator.This paper introduce the LRBT vacuum system including vacuum layout design,physical requirements,vacuum parameters,key equipments,installation and commissioning work.At present,the dynamic vacuum of LRBT is better than 2×10-6 Pa when the target power is 50 kW,meeting the physical requirements.The vacuum equipments are stable and reliable without failure in the past two and a half years of long-term operation includes each vacuum non-standard equipment,vacuum acquisition and measuring equipment,etc.