空间主动型氢脉泽多段式C场设计与仿真分析

Design and Simulation Analysis of Space Active Hydrogen Maser Multi-segment C-field

为降低氢脉泽由C场不均匀导致的跃迁频率相对变化率,提出了三段螺线管和四组线圈两种C场组件设计方式。利用轴线上磁场的高阶展式计算了L=0.05~0.5的三段螺线管构造匀强磁场时的安匝比以及螺线管间距,并选择L=0.2~0.45的三段螺线管进行了磁场的有限元分析,给出了不同宽度的三段螺线管磁场非均匀度分布。其中L=0.45的三段螺线管在储存泡区域的最大非均匀度为0.105%,相应的跃迁频率相对变化率为1.02×10^(-13)。采用相同的方法计算了四组线圈以及五组线圈构造匀强磁场时线圈间的安匝比和间距,并对线圈内的磁场进行了有限元仿真,给出了非均匀度分布,四组线圈式C场筒内磁场在储存泡区域的非均匀度最大值为0.066%,相应的跃迁频率相对变化率为6.42×10^(-14)。

In order to reduce the relative change rate of the transition frequency of the hydrogen masers caused by the inhomogeneous C field,two designs of C field components,three-segment solenoids and four sets of coils,are proposed.Using the high-order expansion of the magnetic field on the axis,the ampere-turn ratio and the solenoid spacing are calculated when the three-segment solenoid with L=0.05-0.5 constructs a uniform magnetic field.The finite element analysis of the magnetic field is carried out with L=0.2-0.45,and the magnetic field non-uniformity distribution with different widths is given.Among them,the maximum non-uniformity with L=0.45 in the storage bubble area is 0.105%,and the corresponding relative change rate of transition frequency is 1.02×10^(-13).Using the same method,the ampere-turn ratio and spacing between coils when four or five sets of coils construct a uniform magnetic field are calculated,and the finite element simulation of the magnetic field in the coil is carried out,and the non-uniformity distribution is given.The maximum non-uniformity of the magnetic field in the storage bubble region in the four sets of coils is 0.066%,and the corresponding transition frequency relative change rate is 6.42×10^(-14).