中文摘要：

于中子照相的2MeV RFQ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。

英文摘要：

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.