Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session X05: Memorial Session for Walter Johnson: Fundamental Symmetry Violation Searches with Molecules and Atoms
8:00 AM–10:00 AM,
Friday, June 7, 2024
Room: 202AB
Chair: Andrei Derevianko, University of Nevada, Reno
Abstract: X05.00005 : Magnetic Field Control and Monitoring for the ACME III Electron Electric Dipole Moment Search*
9:24 AM–9:36 AM
Presenter:
Xing Fan
(Northwestern University)
Authors:
Xing Fan
(Northwestern University)
Siyuan Liu
(Northwestern University)
Daniel G Ang
(Harvard University)
Maya Watts
(Northwestern University)
Cole Meisenhelder
(Harvard University)
Collin Diver
(Northwestern University)
Ayami Hiramoto
(Okayama University)
Takahiko Masuda
(Okayama Univ)
Peiran Hu
(University of Chicago)
Zhen Han
(University of Chicago)
Xing Wu
(Michigan State University)
David DeMille
(University of Chicago)
John M Doyle
(Harvard University)
Gerald Gabrielse
(Northwestern University)
Koji Yoshimura
(Okayama University)
Satoshi Uetake
(Okayama University)
Noboru Sasao
(Okayama University)
Cristian D Panda
(UC Berkeley)
Nicholas R Hutzler
(California Institute of Technology)
Collaboration:
The ACME collaboration
We successfully diminished the ambient field by over $10^4$ times using a three-layer mu-metal shield. Our advanced self-shielding coil system was capable of generating a uniform magnetic field necessary for eEDM measurements, while ensuring the mu-metal shields remained non-magnetized across more than a thousand field reversals. Combining both shields and coils, we attained magnetic field control with a precision of 10 µG and maintained gradients below 1 µG/cm within the spin-precession volume of 100 × 4.2 × 4.2 cm³. Furthermore, the coils are capable of offering a flexible combination of magnetic field gradients, aiding in the examination of potential systematic errors.
The monitoring of magnetic fields is achieved with an array of magnetometers. We also use the magnetically sensitive Q state of ThO as an in-situ co-magnetometer. With these upgrades, we aim to minimize systematic errors for ACME III eEDM measurement to a level below the statistical accuracy of $1\times 10^{-31}e\dot cm$. The newly constructed ACME III beamline including these upgrades will be presented.
*This work was supported by the National Science Foundation, the Gordon and Betty Moore Foundation, the Alfred P. Sloan Foundation, JSPS Kakenhi, and Okayama University RECTOR program.
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