Development of 3He magnetometer for ultra-sensitive measurements of high magnetic fields in Penning traps

开发用于潘宁陷阱高磁场超灵敏测量的 3He 磁力计

• 批准号: 245510948
• 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: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245510948?language=en
• 关键词: Development; 3He; magnetometer; ultra; sensitive

High precision mass measurements nowadays aim to reach a relative mass uncertainty better than 10-11 for tests of fundamental interactions and symmetries. The mass is usually determined in Penning traps via the measurement of the free-space cyclotron frequency of the stored ions assuming the magnetic field is known with similar accuracy. Standard nuclear magnetic resonance methods, however, fail to measure the field with such high accuracy. Our approach (proposal) is based on the measurement of the free induction decay of gaseous, nuclear spin-polarized 3He after a resonant radio-frequency pulse excitation. The essential point is that coherent spin-precession times of several minutes for nuclear spin-polarized 3He can be obtained in typical Penning trap fields of > 4 Tesla. From the measured Larmor frequency (> 100 MHz) the local magnetic field across the sample spins can be determined to an accuracy of better than 10-11. Such a device can be miniaturized to fit next to a Penning trap that allows ultra-sensitive magnetic field monitoring and measurements of magnetic field gradients (gradiometer). The 3He gas is spin-polarized in-situ using a new, non-standard variant of the metastability exchange optical pumping.

如今，高精度质量测量的目标是达到优于10-11的相对质量不确定度，用于基本相互作用和对称性的测试。在潘宁陷阱中，质量通常是通过测量存储离子的自由空间回旋频率来确定的，假设磁场是以类似的精度已知的。然而，标准的核磁共振方法无法以如此高的精度测量磁场。我们的方法(建议)是基于对气态、核自旋极化的3He在共振射频脉冲激发后的自由感应衰变的测量。重要的一点是，在~GT；4特斯拉的典型潘宁陷场中，核自旋极化的~3He的相干自旋进动时间可以达到几分钟。从测量的Larmor频率(&gt；100 MHz)可以确定样本自旋上的局部磁场，其精度优于10-11。这种装置可以小型化，以安装在潘宁捕捉器旁边，该捕捉器允许进行超敏感的磁场监测和磁场梯度(梯度计)的测量。利用亚稳交换光泵的一种新的非标准变体，3He气体被原位自旋极化。

项目成果

Spherical fused silica cells filled with pure helium for nuclear magnetic resonance-magnetometry.

用于核磁共振磁力测定的充满纯氦的球形熔融石英池

• DOI: 10.1063/1.4938251
• 发表时间: 2016
• 期刊: The Review of scientific instruments
• 作者: Andreas Maul;Peter Blümler;Werner Heil;Anna Nikiel;Ernst OttenAndreas Petrich;Thomas Schmidt
• 通讯作者: Thomas Schmidt

Ultrasensitive 3He magnetometer for measurements of high magnetic fields

• DOI: 10.1140/epjd/e2014-50401-3
• 发表时间: 2014-11-03
• 期刊: EUROPEAN PHYSICAL JOURNAL D
• 影响因子: 1.8
• 作者: Nikiel, Anna;Bluemler, Peter;Terekhov, Maxim
• 通讯作者: Terekhov, Maxim