A Novel, Finite-Element Model for Spin-Exchange Optical Pumping Using an Open-Source Code

TL;DR

This paper introduces a comprehensive finite-element model for spin-exchange optical pumping that accounts for vapor heterogeneity and wall relaxation effects, implemented in an open-source code supporting 3D simulations.

Contribution

The novel model incorporates alkali-vapor heterogeneity and wall-relaxation effects into a finite-element framework, providing a versatile open-source tool for detailed optical-pumping simulations.

Findings

Supports full 3D solutions for optical pumping parameters

Models hyperpolarized-gas wall-relaxation via diffusion

Available open-source code for community use

Abstract

A new model is presented for spin-exchange optical pumping using an open-source code, ElmerFEM-CSC. The model builds on previous models by adding the effects of alkali-vapor heterogeneity in optical pumping cells and by modeling the effects of hyperpolarized-gas wall-relaxation using a diffusion model. The code supports full, three-dimensional solutions to optical-pumping models, and solves for (1) laser absorption, (2) alkali vapor concentration, (3) fluid flow parameters, (4) thermal affects due to the pumping laser, and (5) noble gas polarization. The source code for the model is available for researchers to utilize and modify.