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Design of White Neutron Beam Lines Based on 100 MeV Proton Cyclotron

MA Xu;LIU Yingdu;BAO Jie;CHEN Qiming;ZHANG Kai;REN Jie;RUAN Xichao;GUO Gang;OUYANG Xiaoping;School of Materials Science and Engineering, Xiangtan University;Nuclear Data Key Laboratory, China Institute of Atomic Energy;National Innovation Center of Radiation Application, China Institute of Atomic Energy;Northwest Institute of Nuclear Technology;  
In this paper, the neutron energy spectrum and fluence produced by 100 MeV proton beam bombarding tungsten target are simulated by Monte Carlo program FLUKA code. It is obtained that the available neutron energy range from 0.1 MeV to 100 MeV are produced by spallation reaction. The design of white neutron beam line and the study of neutron beam parameters are carried out. Two neutron beams of white neutrons in the directions of 0 ° and 15 ° produced by spallation reaction are optimized. The neutron energy spectra and fluence rates of white neutron beam line in the directions of 0 ° and 15 ° are calculated. The calculation results show that the neutron fluence rate of neutron beam at 16 m from the target center is 5.09 × 10~6 s~(-1) ·cm~(-2), and the ratio of the number of neutrons in the energy range of 0.1~100 MeV to the total number of spallation neutrons emitted from the direction of 0 ° is 94.9%. The neutron fluence rate of the neutron beam at 30 m from the target center is 8.19 × 10~5 s~(-1) ·cm~(-2), and the ratio of the number of neutrons in the energy range of 0.1~100 MeV to the total number of spallation neutrons emitted from the direction of 15 ° is 94.5%. The beam spot inhomogeneity of the two groups of collimating neutron beam lines is less than 10%, and the neutron fluence is more than 5 orders of magnitude higher than the background in the experimental hall. The calculated results show that the parameters of the two neutron beams satisfy the requirements of the experiment. The simulation results can provide data support for the construction of white neutron beams and the design of physics experiments in the future.
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