离子源脉冲中子管电磁场数值模拟

Numerical Modeling of Electromagnetic Field in Neutron Tube of Pulse Ion Source

文中利用有限元分析软件对中子管内的电、磁场分布和离子运动轨迹进行了仿真.通过大量仿真实验,得到了氘离子D^(+1)在不同初始位置(离子源引出口)和初始角度下的运动轨迹,得到了脉冲离子源中子管在正常工作条件下的离子源内的磁场分布和几种不同条件下中子管内部的电场分布.其中中子管加速电极间的电场分布,对于设计锐截止中子管栅极形状、位置和工作电压提供了依据.仿真了离子源外罩优化设计后中子管内的电场分布,电场分布明显改善.

The electrical and magnetic field distribution and ion trajectories in a neutron tube was simulated by using the finite element analysis software. Through a large number of simulations, the trajectory of deuterium ions D^＋ in the initial position （ion source breakout） and at the initial angle was obtained. The magnetic field distribution of the pulse ion source neutron tube in normal working condition and the electric field distribution inside the neutron tube in different conditions were also determined. The electric field distribution between the accelerating electrodes of the neutron tube provides a basis for designing the shape, position, and voltage of the sharp cutoff neutron tube gate. The electric field distribution in the neutron tube was simulated after the ion source housings had been optimized, showing an obvious improvement in the electric field distribution.