Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment
Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment
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DOI：
10.1103/physreva.101.053419
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发表时间：
2020-05-11
影响因子：
2.9
通讯作者：
Zsigmond, G.
中科院分区：
文献类型：
--
作者：
Abel, C.;Afach, S.;Zsigmond, G.
由 16 个激光泵浦标量铯磁力计组成的阵列是中子电偶极矩 (nEDM) 实验的一部分，该实验于 2015 年和 2016 年在 Paul Scherrer 研究所获取数据。它被部署来测量实验磁场的梯度并监测其随时间的演变。该阵列的独创性在于其紧凑的设计，其中单个近红外二极管激光器驱动位于高真空室中的所有磁力计，并选择安装在高压电极上的传感器。我们描述了铯传感器的构造和操作模式的细节，强调了磁场读数的准确性和灵敏度。我们提出了对 nEDM 实验直接有益的磁力计阵列的两个应用：（i）实施校正垂直磁场梯度漂移的策略和（ii）均匀化磁场的程序。第一个降低了 nEDM 结果的不确定性。第二个使得横向中子自旋弛豫时间超过1500秒，将nEDM实验的统计灵敏度提高了约35%，有效地将nEDM数据采集率提高了1.8倍。
An array of 16 laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's magnetic field and to monitor their temporal evolution. The originality of the array lies in its compact design, in which a single near-infrared diode laser drives all magnetometers that are located in a high-vacuum chamber, with a selection of the sensors mounted on a high-voltage electrode. We describe details of the Cs sensors' construction and modes of operation, emphasizing the accuracy and sensitivity of the magnetic-field readout. We present two applications of the magnetometer array directly beneficial to the nEDM experiment: (i) the implementation of a strategy to correct for the drift of the vertical magnetic-field gradient and (ii) a procedure to homogenize the magnetic field. The first reduces the uncertainty of the nEDM result. The second enables transverse neutron spin relaxation times exceeding 1500 s, improving the statistical sensitivity of the nEDM experiment by about 35% and effectively increasing the rate of nEDM data taking by a factor of 1.8.