Pickup coil optimization for polarized 3He system

• Published in: European physical journal plus Vol. 132; no. 7; p. 308
• Main Authors: Tu, X. Q., Zheng, H., Sun, G. A., Gong, J., Ren, Y., Liu, L. J., Gao, P. L., Wang, W. Z., Yan, H.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2017; Springer Nature B.V
• Subjects: Applied and Technical Physics; Atomic; Complex Systems; Condensed Matter Physics; Configurations; Gases; Mathematical and Computational Physics; Molecular; Neutrons; NMR; Nuclear magnetic resonance; Nuclear physics; Optical and Plasma Physics; Optimization; Physics; Physics and Astronomy; Pickup coils; Polarization (spin alignment); Rare gases; Regular Article; Signal to noise ratio; Spin exchange; Theoretical
• ISSN: 2190-5444; 2190-5444
• DOI: 10.1140/epjp/i2017-11580-y

. Not only can polarized 3 He 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 3 He cell’s polarization. In this work, we tried to optimize the pickup coil for the spin exchange optical pump (SEOP) based 3 He 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 3 He cell with radius a , we found the optimized coil radius is 5 ( a + d ) , where d is the coil to cell surface distance. For a cylindrical 3 He 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 3 He systems.