Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment

C. Abel, S. Afach, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, E. Chanel, P. J. Chiu, C. B. Crawford, Z. Chowdhuri, M. Daum, S. Emmenegger, L. Ferraris-Bouchez, M. Fertl, B. Franke, W. C. Griffith, Z. D. Grujić, L. Hayen, V. HélaineN. Hild, M. Kasprzak, Y. Kermaidic, K. Kirch, P. Knowles, H. C. Koch, S. Komposch, P. A. Koss, A. Kozela, J. Krempel, B. Lauss, T. Lefort, Y. Lemière, A. Leredde, A. Mtchedlishvili, P. Mohanmurthy, M. Musgrave, O. Naviliat-Cuncic, D. Pais, A. Pazgalev, F. M. Piegsa, E. Pierre, G. Pignol, P. N. Prashanth, G. Quéméner, M. Rawlik, D. Rebreyend, D. Ries, S. Roccia, D. Rozpedzik, P. Schmidt-Wellenburg, A. Schnabel, N. Severijns, R. Tavakoli Dinani, J. Thorne, A. Weis, E. Wursten, G. Wyszynski, J. Zejma, G. Zsigmond

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

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.

Original languageEnglish
Article number053419
JournalPhysical Review A
Volume101
Issue number5
DOIs
StatePublished - May 2020

Bibliographical note

Publisher Copyright:
© 2020 American Physical Society.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint

Dive into the research topics of 'Optically pumped Cs magnetometers enabling a high-sensitivity search for the neutron electric dipole moment'. Together they form a unique fingerprint.

Cite this