Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session F01: Poster Session I (4:00pm-6:00pm PT)
4:00 PM,
Tuesday, June 6, 2023
Room: Exhibit Hall C
Abstract: F01.00125 : ACME III Electron Electric Dipole Moment Search*
Presenter:
Zhen Han
(University of Chicago)
Author:
Zhen Han
(University of Chicago)
Collaborations:
ACME Collaboration: C. Diver1, Z. Han2, P. Hu2, M. Watts 1, D. DeMille2, D. Ang3, J. Doyle3, G. Gabrielse1, A. Hiramoto4, N., X. Fan1, Z. Lasner3, S. Liu1, T. Masuda4, C. Meisenhelder3, J. Mitchell1, C. Panda6, N. Sasao4, S. Uetake4, X. Wu2,3
Improved statistical sensitivity is sought in ACME III by employing several new techniques. Listed along with their projected gain in eEDM sensitivity over ACME II in parentheses, these improvements are: A new cryogenic beam source with in-situ target changing (×1.2); An electrostatic lens to focus the ThO molecular beam into the detection region3 (×4.4); A longer interaction chamber that permits longer spin-procession times4 (×2.0) and silicon photomultipliers (SiPMs) as photon detectors5 (×2.5); Elimination of excess noise from timing jitter in the data acquisition system6 (×1.7), corresponding to a total projected improvement by a factor of ∼40.
Aiming also to improve on systematic errors, the transparent electric field plates in ACME (through which state preparation and detection lasers pass) will be mounted in a stress-free manner, and low birefringence vacuum window material will be used, to reduce dangerous birefringence gradients. A new magnetic shielding system is designed to provide <0.1 nT field control. Using ThO in the Q state as a magnetometer will further suppress systematic errors through better magnetic field control.
We will review the performance of each of these improvements.
*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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