论文标题
ACME电子EDM搜索的冷和重分子的静电聚焦
Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search
论文作者
论文摘要
电子电偶极矩（EDM）的当前最佳上限，$ | d_e | <1.1 \ times10^{ - 29} \，$ e $ \ cdot $ cm（$ 90 $％置信度），由ACME协作设置为2018年。Acme实验使用了tho of tho of tho molecules的ACME实验。通过从低温缓冲液气束源中更有效地利用分子，可以改善统计不确定性。在这里，我们证明了带有己键镜头的光束的静电聚焦。这导致在下游可检测到的分子通量中的$ 16 $增强倍数，其光束线类似于为下一代ACME构建的光束线。我们还展示了一种升级的旋转冷却计划，该计划将基态人口增加了3.5美元，而没有冷却，与期望一致，比ACME中的$ 1.4 $ 1.4美元。当结合其他证明的改进时，我们会在下一代ACME电子EDM搜索的统计灵敏度上提高统计敏感性的阶段。
The current best upper limit for electron electric dipole moment (EDM), $|d_e|<1.1\times10^{-29}\,$e$\cdot$cm ($90$% confidence), was set by the ACME collaboration in 2018. The ACME experiment uses a spin-precession measurement in a cold beam of ThO molecules to detect $d_e$. An improvement in statistical uncertainty would be possible with more efficient use of molecules from the cryogenic buffer gas beam source. Here, we demonstrate electrostatic focusing of the ThO beam with a hexapole lens. This results in a factor of $16$ enhancement in the molecular flux detectable downstream, in a beamline similar to that built for the next generation of ACME. We also demonstrate an upgraded rotational cooling scheme that increases the ground state population by $3.5$ times compared to no cooling, consistent with expectations and a factor of $1.4$ larger than previously in ACME. When combined with other demonstrated improvements, we project over an order of magnitude improvement in statistical sensitivity for the next generation ACME electron EDM search.
