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Compact 3He gas polarizers based on metastability-exchange optical pumping.

Pierre-Jean Nacher1, Cavin Talbot1, Hadi Loutfi1

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New polarizers efficiently deliver highly nuclear-polarized helium-3 (3He) gas using metastability-exchange optical pumping and peristaltic compression. These systems achieve significant polarization for various applications.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Nuclear Physics
  • Materials Science

Background:

  • High nuclear polarization of helium-3 (3He) is crucial for various applications, including medical imaging and fundamental physics research.
  • Existing methods for polarizing 3He gas face limitations in speed, efficiency, and flexibility for delivering polarized gas to external systems.

Purpose of the Study:

  • To design, construct, and operate novel polarizers capable of delivering highly nuclear-polarized 3He gas with enhanced flexibility.
  • To investigate and model the key processes affecting the performance of 3He polarizing systems.

Main Methods:

  • Utilized metastability-exchange optical pumping for rapid polarization of 3He nuclei at millibar pressures.
  • Employed peristaltic compression to transfer optically polarized 3He gas to storage or experimental cells.
  • Developed models incorporating gas flow, diffusion, and nuclear relaxation to analyze system performance.

Main Results:

  • Demonstrated typical 3He gas polarization values (M) of 0.4-0.6.
  • Achieved initial compression to over 600 mbar.
  • Obtained flow rates up to 5 standard cubic centimeters per minute.

Conclusions:

  • The developed polarizers offer a flexible and efficient method for producing and delivering highly nuclear-polarized 3He gas.
  • The study provides insights into optimizing polarizer design by analyzing limiting factors like gas flow and relaxation.
  • The demonstrated performance supports the utility of these systems for diverse applications requiring polarized 3He.