Magnetometry at the fTesla-scale for neutron EDM experiments using a co-habiting Xenon magnetometer based on free spin precession

使用基于自由自旋进动的共居氙气磁力计进行 fTesla 级磁力测量，用于中子 EDM 实验

• 批准号: 167716548
• 负责人: Professor Dr. Werner Heil
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/167716548?language=en
• 关键词: Magnetometry; fTesla; scale; neutron; EDM

Novel neutron EDM experiments, like the international neutron EDM collaboration at the Paul Scherrer Institute (PSI) aim to reach a measurement sensitivity of ≈ 10-28 ecm, a two orders of magnitude improvement compared to the present upper limit of dn < 3 x 10-26 e∙cm for the neutron electric dipole moment (nEDM). In order to reach this ambitious goal, magnetometry reaching the 1 fT sensitivity level during a typical Ramsey cycle of 200s is demanded. In this proposal we concentrate on the development of a Xenon magnetometer which should be able to monitor and correct geometric phase induced false nEDM effects. These false effects, which set the present systematic limit of dn, false ≈ 10-26ecm, result from the interaction of the well known vxE-field with magnetic field gradients and produce a frequency shift linear to the electric field mimicking an nEDM. This frequency shift can be measured using the Ramsey method of separated oscillatory fields. Spin-polarized Xenon is produced by optical pumping and the free precession of nuclear spins (co-habiting atomic Xenon magnetometer) is monitored within the ultracold neutron (UCN) storage volume of the nEDM spectrometer.

新型的中子EDM实验，例如Paul Scherrer Institute（PSI）的国际中子EDM协作，旨在达到≈10-28ECM的测量敏感性，与当前的DN <3 x 10-26 E cm的上限相比，在中子电动电动型矩（NEDM）的DN <3 x 10-26 e cm相比，它有两个数量级的改善（NEDM）。为了达到这个雄心勃勃的目标，需要在典型的Ramsey循环中达到1英尺灵敏度水平的磁力测定法。在此提案中，我们集中于Xenon磁力计的发展，该磁力计应该能够监测和纠正几何相诱导的虚假NEDM效应。这些假效应设置了当前DN的系统限制，即假≈10-26ECM，这是由于众所周知的VXE场与磁场梯度的相互作用而产生的，并对模仿NEDM的电场产生了频移线性。使用分离的振荡场的拉姆齐方法测量。自旋极化氙气是通过光学泵送产生的，并且在NEDM光谱仪的Ultrocold Neutron（UCN）存储体积中监测了核自旋（共摄取原子XENON磁力计）的自由预防。