一种外日球层拾起离子探测器的设计与仿真

Design and simulation of detector for outer heliosphere pickup ions

针对外日球层低速、低密度、低温的拾起离子(PUIs)的高分辨探测需求,以带顶盖超环面静电分析器、阻滞势分析器和线性场飞行时间系统为基础设计了一种新型高分辨拾起离子探测器。经过有限元仿真分析,探测器可实现离子(氢)的速度范围15.7~1072.2 km/s,密度范围0.0001~100 cm^(-3),温度高于474.9 K的探测,同时可实现典型拾起离子(氢、氦、碳、氮、氧、氖)的成分分辨,质谱分辨率(M/ΔM)大于40。

To enable the high-resolution detection of low-speed,low-density and low-temperature pickup ions(PUIs)in the outer heliosphere,a new high-resolution detector is designed based on the toroidal top-hat electrostatic analyzer,retarding potential analyzer and linear-electric-field time-of-flight analyzer.Using finite element simulation,the velocity range of PUIs(hydrogen)can be detected at 15.7~1072.2 km/s,with the density range being 0.0001~100 cm^(-3)and the temperature higher than 474.9 K.Component discrimination can also be achieved for typical pickup ions(hydrogen,helium,carbon,nitrogen,oxygen,and neon),with the mass spectral resolution(M/ΔM)larger than 40.