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Description
The 50 MeV medium-energy proton cyclotron device developed by China Institute of Atomic Energy provides important test conditions for space radiation environment simulation, space radiation protection design and application research. This accelerator fills the gap of proton and neutron irradiation test conditions in the energy range of 30 MeV to 50 MeV in China.
To provide a large-area and high-uniformity proton beam spot of 300 x 300 mm for irradiation tests, it is necessary to perform beam homogenization treatment to meet the requirements of irradiation area and uniformity simultaneously. To achieve both large beam spot and high uniformity, this paper compares schemes such as scanning magnets, beam expansion and scattering, and nonlinear high-order magnets. The design and beam dynamics simulation of the proton target station transmission system in the simulation experimental device are carried out. Through multiple beam transmission simulations with random errors, the uniformity of the beam reaches 90% under the condition of obtaining a 300 x 300 mm large beam spot. Finally, the scanning magnet scheme is selected as the most suitable beam homogenization scheme for this simulation device,and the overall design results of the beam transmission system are presented.
