物理学报2018，Vol.67Issue(1)：74-84,11.DOI:10.7498/aps.67.20171701
100 keV质子与低高能质子在绝缘微孔中输运特性的对比分析
Simulation analyses of 100-keV as well as low and high energy protons through insulating nanocapillary
摘要
Abstract
In order to clearly understand the physical images of incident ions passing through the insulating nanocapillary, in this work we establish a theoretical model, in which the matlab program is combined with the Monte Carlo method, to estimate the time evolution of transmission features, such as the angular and deposited charge distribution, three-dimensional (3D) trajectories of H+ particles with proton incident energies of 10 keV, 100 keV and 1 MeV at -1?title angle. The simulation results show that the transmission mechanism of 100 keV protons is different from those of 10 keV and 1 MeV protons. After a sufficiently charging and discharging stage, 10 keV H+ particles are guided along the direction of capillary axis, indicating that the guiding force from the surface charge patches is significant, and the small-angle scattering of 1 MeV protons under the capillary inner wall is a physical process that determines the transport of H+ particles through the nanocapillary. However, for 100 keV H+ particles, the centroid angle gradually shifts from the guiding direction to the direction close to the incident beam, which is attributed to the fact that the stochastic inelastic binary collision below the surface is the main transmission mechanism at the beginning. After the charging and discharging reach an equilibrium state, the H+ particles are likely to pass through the nanocapillary, and the main transmission mechanism is the charge-patch-assisted specular scattering. This mechanism deepens the understanding of the transport behavior of protons through the nanocapillary, which will contribute to the control and application of the 100 keV proton beam.关键词
质子/绝缘微孔/输运机制/模拟Key words
proton/insulating nanocapillary/transmission mechanism/simulation引用本文复制引用
朱炳辉,杨爱香,牛书通,陈熙萌,周旺,邵剑雄..100 keV质子与低高能质子在绝缘微孔中输运特性的对比分析[J].物理学报,2018,67(1):74-84,11.基金项目
国家自然科学基金(批准号:11775103, 11675067)和国家自然科学基金青年科学基金(批准号:11605078)资助的课题.Project supported by the National Natural Science Foundation of China(Grant Nos.11775103, 11675067)and the National Natural Science Foundation for Young Scholars of China(Grant No.11605078). （批准号:11775103, 11675067）
