四极－十六极分区式线型阱中汞离子囚禁仿真研究

利用SIMION软件建立了四极-十六极分区式线型离子阱系统模型，在此基础上仿真模拟了汞离子在四极阱和十六极阱中被囚禁时的第一稳定区，并分析了离子在不同阱中的运动特性。研究了汞离子云在分区式阱中的囚禁体积和速度分布，以及在不同囚禁区域之间的穿梭过程。模拟得出了稳态情况下分区式阱中不同囚禁区域的粒子数密度分布，验证了分区式离子阱中离子云被连续囚禁、穿梭时粒子数衰减和补偿。同时，根据以上数据分析讨论了汞离子囚禁时的多普勒效应，估算了基于此分区式离子阱的汞离子微波钟的性能水平。

Simulation of Trapping Mercury Ions in A Quadrupole Multipole Separated and Linear Ion Trap

A model of quadrupole-multipole separated and linear ion trap was built by SIMION simulation software, based on this model the first steady region when Mercury ions are trapped respectively in two trapping regions, i.e., quadrupole trap and sixteen pole trap was simulated in this work, and the characters of ion motion in two trapping regions were analyzed. In addition, the trapping volume and velocity distribution of the ion clouds in quadrupole-multipole ion trap as well as the process that Mercury ion clouds shuttle between two trapping regions were studied. When those ions trapped go into steady state the ion number density distribution in two trapping regions are discussed respectively. In particular, ion number degradation and compensation were demonstrated when Mercury ion clouds had been trapped and shuttled continuously in quadrupole multipole separated trap. In the end, according to the analyses above, Doppler frequency shift associated with Mercury ion trapping in quadrupole-multipole ion trap was calculated and performance level of Mercury ion microwave clock was estimated.