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漂移管直线加速器(DTL)是中国散裂中子源(CSNS)直线加速器的主要部分,负责将脉冲流强为15mA的负氢离子从3 MeV加速到80 MeV,再注入到快循环同步加速器(RCS)中实现进一步加速。CSNS DTL由4节长度约9m的RF腔体组成,单节RF腔体由1台3MW的速调管提供功率。每节腔体又分为3段长约3m的机械腔体以便于加工和安装。DTL腔体和漂移管的研制是整个CSNS直线加速器的关键。本文介绍了CSNS DTL研制过程,包括国内首次在强流质子加速器RF腔内表面进行高导无氧铜电镀、新型磁铁线圈的研制、小孔径磁铁的高精度测量等。加工及测试结果均满足CSNS的设计要求。
The Drift Tube Linear Accelerator (DTL) is a key part of the China spallation neutron source (CSNS) linear accelerator and is responsible for accelerating negative hydrogen ions with a pulse current of 15 mA from 3 MeV to 80 MeV and injecting them into a fast-cycling synchrotron RCS) to achieve further acceleration. The CSNS DTL consists of four RF chambers of approximately 9 m in length. The single RF chamber is powered by a 3MW klystron. Each section of the body is divided into three sections of about 3m mechanical cavity for easy processing and installation. The development of DTL cavities and drift tubes is key to the entire CSNS linear accelerator. This paper introduces the development process of CSNS DTL, including the first high-conductivity oxygen-free copper electroplating in the RF cavity surface of strong proton accelerator in China, the development of new magnet coils and the high precision measurement of small aperture magnet. The processing and test results meet the design requirements of CSNS.