AI 中文总结
本文研究偶极驱动线性保罗阱的场偏差，通过实验证实偶极驱动会使径向久期频率不等，提出的几何修改方案可显著降低径向-轴向耦合。
AI 中文摘要
理想线性保罗阱（LPT）的几何结构与理想四极驱动方案的偏差会给离子阱势引入缺陷。本文研究了采用常规偶极驱动构型的LPT中这类缺陷的影响，演示了在零和负端盖电压下沿轴向囚禁Li⁺离子的情况，该现象源于电场径向-轴向耦合导致的修正轴向a-q空间。偶极驱动构型会解除径向阱势的简并，使径向 secular（ secular 译为“久期”）频率不等，这一点已通过实验证实。本文将偶极驱动与阱尺寸的综合效应总结为二维图谱，用于量化理想行为的偏差；基于该图谱，提出一种几何修改方案，可显著降低阱势的径向-轴向耦合。
英文摘要
Deviations from both the ideal linear Paul trap (LPT) geometry as well as the ideal quadrupole driving scheme introduce imperfections to ion trapping potentials. We investigate the effects of these imperfections in a LPT operated in a conventional dipole-drive configuration. We demonstrate the trapping of the Li$^+$ ions along the axial direction with zero and negative end-cap voltages. This occurs due to the modified axial $a-q$ space resulting from radial-to-axial coupling of the electric field. The dipole drive configuration lifts the degeneracy of the radial trapping potentials, resulting in unequal radial secular frequencies, and this is demonstrated experimentally. The combined effects of dipole drive and trap dimensions are summarized in a two-dimensional map that quantifies deviations from ideal behaviour. Based on this map, we propose a geometric modification that significantly reduces radial-to-axial coupling of the potential.
Comments7 pages, 6 figures
