The Optimization of Uniform Magnetic Field for an Experimental Search for Axion-mediated Spin-Dependent Interaction

Abstract

Possible interaction between unpolarized and polarized nuclei in long range may provide a new source for PT-violation. Moody and Wilczek proposed that such force might be mediated by the axion. A new idea of tabletop experiment searching for such interaction has been proposed from ARIADNE collaboration including SQUID NMR with polarized 3He nuclei using the metastability-exchange optical pumping (MEOP) method. In this method, uniform magnetic field is required to produce the polarized 3He gas with a laser at 1083 nm. We describe the finite element method (FEM) as well as the semi-Analytical approach to generate uniform field to preserve polarization with a number of Helmholtz Coils compared with each other.