Optimization of a device for positron moderation based on a magnetic bottle

Abstract

Abstract The design optimization of a magnetic bottle device for high-efficiency positron moderation is described herein. The interaction between positrons and matter, including positron tracking, was performed via GEANT and COMSOL simulation. Optimization was performed for a 10 kW power supply for the excitation of two magnetic coils and were established geometry sizes of the device, namely a chamber with a radius of 100\xa0mm and a length of 300\xa0mm. The irradiation of a Ti foil with a thickness of 1 ÷ 10 μ m at the TR19 cyclotron for 8 h with a proton current of 10 μ A can produce 48V with an activity of 6 ÷ 60\xa0MBq. Given such a source of fast positrons for use in the optimized magnetic bottle device, a slow positron beam intensity of 2 ÷ 10 × 104 s−1 can be achieved.