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.
出处
《核技术》
CAS
CSCD
北大核心
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
关键词
注入器
发射度
流强
传输效率
微波离子源
LEBT
Injector, Emmitance, Beam current, Transport efficiency, Microwave-driven ion source, LEBT
