An injection system of 50mA@50keV 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 extracted 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.