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，以测试基本相互作用和对称性。潘宁陷阱中的质量通常是通过测量存储离子的自由空间回旋加速器频率来确定的，假设磁场以类似的精度已知。然而，标准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）基于对谐振射频脉冲激发后气态核自旋极化 3He 的自由感应衰变的测量。要点是，核自旋极化 3He 的相干自旋进动时间可以在 > 4 特斯拉的典型潘宁陷阱场中获得几分钟。根据测得的拉莫尔频率 (> 100 MHz)，可以确定样品自旋上的局部磁场，其精度优于 10-11。这种设备可以小型化以安装在潘宁陷阱旁边，从而可以进行超灵敏的磁场监测和磁场梯度测量（梯度计）。 3He 气体使用亚稳态交换光泵浦的新型非标准变体进行原位自旋极化。

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