Simulation and design of a curved magnetic positron transportatio n system

We are reporting on the design and simulation of a curved positron-transportation system for Doppler-broadening positron spectroscopy purposes, with the use of CST simulation software. Positron spectroscopy is widely used in surface science and nanoscience. In the present system positrons travel 114 centimeter from the moderator to the target on a curved trajectory with the radius of 150 cm. This system is expected to deliver beams at the target with the cross section diameter 0.16 times smaller than that at the moderator. In addition, the beam energy would be ranging from 200 eV to 20 keV.