Ball, J.E. orcid.org/0000-0003-4795-4007, Wild, J.M. orcid.org/0000-0002-7246-8660 and Norquay, G. orcid.org/0000-0002-4108-9035 (2024) Evaluating modeling approaches for Rb-129Xe spin-exchange optical pumping and the effect of Rb vapor density heterogeneity. Journal of Applied Physics, 136 (24). 243104. ISSN 0021-8979
Abstract
The applicability of commonly used 129Xe nuclear polarization (PXe) buildup models to large optical cell polarizers, which operate at lower gas pressures when compared to small cell polarizers for which spin-exchange optical pumping (SEOP) models were originally developed, has yet to be systematically evaluated. In addition, spatial heterogeneity of Rb vapor density ([Rb]) and its impact on SEOP in low pressure, large optical cell polarizers remains poorly understood. In this theoretical study, it was shown that 1D analytical and numerical PXe buildup models yield diverging PXe and critical flow rate values at low flow rates and high laser absorption, contributing to the discrepancy between theoretical and experimentally measured production rates. Additionally, it was found that [Rb] heterogeneity leads to lower PXe buildup and an undesirable increase in optimal cell temperature, while the optimal laser absorption remains relatively unchanged. The updated simulation framework presented here can be utilized to model other SEOP systems.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2024. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercialNoDerivs 4.0 International (CC BY-NC-ND) license (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Chemical equilibrium; Fundamental constants; MATLAB, Magnetic resonance imaging; Absorption line; Numerical methods; Hyperfine structure; Quantum mechanical principles; Quantum optics; Fluid flows |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Medicine and Population Health |
Funding Information: | Funder Grant number MEDICAL RESEARCH COUNCIL MR/M008894/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/X025187/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 17 Jan 2025 10:58 |
Last Modified: | 17 Jan 2025 10:58 |
Status: | Published |
Publisher: | AIP Publishing |
Refereed: | Yes |
Identification Number: | 10.1063/5.0233678 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:221538 |