2022 CAP Congress / Congrès de l'ACP 2022

Magnetic resonance requirements and shim coil design for the TUCAN EDM experiment

6 Jun 2022, 17:00

15m

MDCL 1110 (McMaster University)

Oral (Non-Student) / Orale (non-étudiant(e)) Nuclear Physics / Physique nucléaire (DNP-DPN) M3-7 Fundamental Symmetries and New Physics at Low Energy I (DNP) | Symétries fondamentales et nouvelle physique à basse énergie (DPN)

Speaker

Prof. Jeffery Martin (The University of Winnipeg)

Description

The TUCAN EDM experiment aims to measure the neutron electric dipole moment (EDM) to a precision of $1\times {10}^{-27}e$cm. The experiment is a precise relative measurement of the spin precession frequency of ultracold neutrons stored in a bottle, placed in homogenous magnetic and electric fields. The magnetic field is shielded from external influences by conducting the experiment in a magnetically shielded room (MSR). A main precession field of $B_0=1\mu$T is produced by an internal coil. Magnetic field inhomogeneity in the coil/MSR system will cause the neutron spins to dephase as they precess, reducing the statistical precision of the experiment. Controlling the homogeneity is also important for false EDM signals. A system of square shim coils, mounted on the surface of a cube surrounding the experiment, is being developed to make adjustments to the field. This presentation will discuss quantitatively the magnetic homogeneity requirements, and demonstrate the ability of the shim coil design to meet them.

Presentation materials

jmartin-cap-shims-2022-vfinal.pdf