Improved magnetic shielding and coil systems for ACME III electron EDM search

POSTER

Abstract

The measurement of electron electric dipole moment (EDM) is a powerful probe for physics beyond the Standard Model. The ACME II Experiment in 2018 reported the current most stringent upper limit for electron EDM, of de<1.1×10-29 e·cm  (Nature, 562, (2018) 355-360). The next generation of the experiment is currently under development, aiming to improve the sensitivity by at least an order of magnitude. This upgrade features a longer interaction region to increase the spin precession time, and significantly smaller magnetic-field-related noises. To achieve this, a custom-built 3-layer mu-metal magnetic shield covering a larger interaction region is under construction. With optimum geometric design and state-of-the-art degaussing systems, the shield is expected to reduce the ambient magnetic field to <0.1nT. A self-shielding coil and a set of gradient coils were also under construction, enabling the precise control of the magnetic field in the interaction region and the detailed assessment of systematic uncertainties associated with magnetic fields.

*This work is supported by National Science Foundation, the Gordon and Betty Moore Foundation, and the Alfred P. Sloan Foundation.

Presenters

  • Siyuan Liu

    • Northwestern University

Authors

  • Siyuan Liu

    • Northwestern University

  • Bingjie Hao

    • Northwestern University

  • Daniel G Ang

    • Harvard University

  • David P DeMille

    • Yale University
    • The University of Chicago
    • University of Chicago

  • John M Doyle

    • Harvard University

  • Zhen Han

    • University of Chicago

  • Ayami Hiramoto

    • Okayama University

  • Peiran Hu

    • University of Chicago

  • Nicholas Hutzler

    • California Institute of Technology
    • Caltech
    • Division of Physics, Mathematics, and Astronomy, California Institute of Technology

  • Daniel D Lascar

    • Northwestern University

  • Zack Lasner

    • Harvard University

  • Takahiko Masuda

    • Okayama Univ
    • Okayama University

  • Cole Meisenhelder

    • Harvard University

  • John Mitchell

    • Northwestern University

  • Cristian D Panda

    • University of California, Berkeley
    • UC Berkeley

  • Noboru Sasao

    • Okayama University

  • Satoshi Uetake

    • Okayama University

  • Xing Wu

    • University of Chicago
    • Yale University
    • University of Chicago, Harvard University

  • Koji Yoshimura

    • Okayama University

  • Gerald Gabrielse

    • Northwestern University