LECR4 is the first ECR ion source using evaporative cooling technology in the world.Its unique feature is that the solenoids were made from solid square copper wires(3.32 mm×5.77 mm with insulation),and that all the coils are entirely immersed in the room temperature coolant.The coils can produce a maximum axial magnetic field up to 2.5 T.LECR4 aims to provide intense multiple charge state ion beams for SSC-Linac project-a new Linear injector for the Separated Sector Cyclotron(SSC).Presently,some ion beams with different M/Q ratio have been accelerated successfully with the RFQ and DTL,such as 200 eμA of 16O^5+,200 eμA of 40Ar^8+,50 eμA of 209Bi^30+etc.The measured transmission efficiency of RFQ is up to 90%.The layout of LECR4 ion source and the LEBT is shown in Fig.1.
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