中国散裂中子源DTL漂移管的预准直

漂移管直线加速器(Drift Tube Linac,DTL)是中国散裂中子源(China Spallation Neutron Source,CSNS)直线加速器的主要部分,负责将脉冲流强为15 m A的负氢离子从3 Me V加速到80 Me V,再注入到快循环同步加速器(Rapid Cycling Synchrotron,RCS)中实现进一步加速。DTL加速器本身技术工艺复杂,要求极高的加工精度和准直安装精度,是CSNS的关键技术之一。本文介绍了中国散裂中子源漂移管的预准直方法,从最初的预研到正式安装,解决了一系列难题,包括漂移管的标定、安装和准直调整,形成一整套流水线式的预准直流程,最终漂移管预准直的精度优于物理设计指标,可为同类别的准直测量提供参考。

Pre-alignment of DTL for China Spallation Neutron Source

Background:The drift tube linac (DTL) is the main part of China Spallation Neutron Source (CSNS), which can provide 15-mA peak current beam with energy gain from 3 MeV to 80 MeV. And then the beam will be injected into the rapid cycling synchrotron (RCS) for further accelerating.Purpose:The manufacturing and fabrication of DTL cavity and drift tubes is very complicated, which requires high processing precision and installation accuracy. In this paper, the pre-alignment of DTL was introduced. Methods:We overcame a lot of difficulties in this process, including the fiducialization, installation and alignment.By distributing the error properly and following the regular pre-alignment process, this work was finally finished on time.Results:The pre-alignment accuracy was better than the requirement tolerance which is 0.05 mm in three directions.Conclusion:The results show that the pre-alignment is successful. This job can provide some experiences to other alignment measurement with the same process.