Pickup coil optimization for polarized 3He system

X. Q. Tu; H. Zheng; G. A. Sun; J. Gong; Y. Ren; L. J. Liu; P. L. Gao; W. Z. Wang; H. Yan

doi:10.1140/epjp/i2017-11580-y

2022 Impact factor 3.4

EPJ PLUS - Condensed Matter and Complex Systems

Eur. Phys. J. Plus (2017) 132: 308
https://doi.org/10.1140/epjp/i2017-11580-y

Regular Article

Pickup coil optimization for polarized ³He system

X. Q. Tu¹^,2, H. Zheng¹^,2, G. A. Sun¹^,2, J. Gong¹^,2, Y. Ren¹^,3, L. J. Liu¹^,2, P. L. Gao¹^,2, W. Z. Wang¹^,2 and H. Yan¹^,2^*

¹ Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, 621900, Sichuan, China
² Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, 621900, Sichuan, China
³ State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, 62101, Sichuan, China

^* e-mail: hyan@cape.cn

Received: 19 February 2017
Accepted: 5 June 2017
Published online: 17 July 2017

Abstract

Not only can polarized ³He gas work as neutron spin filters (NSF) but also search for spin-dependent new interactions beyond the standard model. For both cases, the relative polarization of the spin polarized noble gas needs to be measured precisely. Various NMR techniques are applied practically to monitor the ³He cell’s polarization. In this work, we tried to optimize the pickup coil for the spin exchange optical pump (SEOP) based ³He system. By optimizing the signal-to-noise ratio (SNR), we found that the coil should be wound by thin wire for a higher number of turns. The optimized sizes of the pickup coils depend on the detailed configurations. For a spherical ³He cell with radius a, we found the optimized coil radius is , where d is the coil to cell surface distance. For a cylindrical ³He cell with height h, for the configurations where the coils were placed either along or perpendicular to the longitudinal axis of the target cell, we derived the optimized sizes for the specific configurations. We believe these results are practically useful for designing pickup coils of polarized ³He systems.