Design of Low Energy Beam Transport System for CSRe Molecular Ion Research Facility

The design of a low energy beam transport system for CSRe molecular ion research facility was presented. The electric field distribution of the 150kV high voltage accelerator was simulated by Poisson/Superfish code. The results show that the electric field strengths of various region spaces were far lower than the value of breakdown electric field. The transmission of the molecular ion beam from the ion source was simulated by Beampath in the high voltage accelerator. The beam envelope indicates that the electric field of acceleration section has a strong focusing effect on the molecular ion beam, and the beam size is small at the end of the accelerate tube. The Trace-3D code was used to design the magnetic analysis system with high resolution and the matching section for injecting into RFQ accelerator. Finally, through the simulation, the molecular ion beam with the mass number of 150 was analyzed and the injection matching of the RFQ accelerator by one triplet quadrupoles was achieved.