强流RFQ加速器注入器的研究进展  

Progresses in developing a high current RFQ injector

作　　者：彭士香[1] 张萌[1] 赵捷[1] 徐蓉[1] 任海涛[1] 吕鹏南[1] 宋执中[1] 于金祥[1] 袁忠喜[1] 郭之虞[1] 

机构地区：[1]北京大学物理学院重离子物理研究所,核物理与核技术国家重点实验室,北京100871

出　　处：《核技术》2009年第3期165-168,共4页Nuclear Techniques

基　　金：国家自然科学基金(10675015)资助

摘　　要：用于中子照相的2MeVRFQ加速器须注入50mA@50keV的脉冲D+离子束,束流占空比为1/10,发射度0.2π·mm·mrad,α=1.93,β=5.16cm/rad。为此,我们建立了两台基于2.45GHz的永磁微波离子源实验台。当微波功率小于450W时,引出氢离子流的总流强大于80mA,质子比好于90%,束流的归一化均方根发射度约为0.2–0.3π·mm·mrad。LEBT(低能束流输运线)实验台使用一个半包围结构螺线管磁透镜,束流传输效率大于80%。为优化源体设计,对源室尺度和放电室内衬材料研究,为源体的优化提供了依据。An injection system of 50 mA @50 keV D^＋ ion beam is needed for thermal neutron radiography based on 2 MeV RFQ at PKU. Its duty factor is 10%. The RMS emmitance is 0.20 π·mm·mrad with α= 1.93 and β=5.16 cm/rad. To achieve these specifications, we developed an ion source test bench and a LEBT test bench based on a permanent magnet 2.45 GHz microwave-driven ion source （ECR）. When the microwave power is less than 450 W, the total exwacted H ＋ current is larger than 80 mA, and the proton fraction is better than 90%. The RMS emmitance is about 0.2-0.3 π·mm·mrad. With a semi-closed solenoid, the transport efficiency of LEBT is better than 80%. In addition, studies were conducted on influence of liner material and size of the inner diameter.

关 键 词：注入器 发射度 流强 传输效率 微波离子源 LEBT 

分 类 号：TL503.3[核科学技术—核技术及应用]