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Nuclear spin-polarized helium-3 gas, crucial for applications like neutron spin filters, can now be compressed to 100 kPa using a novel apparatus. This method enhances polarization for practical use.

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Area of Science:

  • Nuclear physics
  • Atomic physics
  • Materials science

Background:

  • High nuclear spin polarization of helium-3 (3He) gas is essential for applications like neutron spin filters and MRI.
  • Current methods like metastability-exchange optical pumping (MEOP) achieve high polarization but at low pressures (~0.1 kPa).
  • A need exists for a method to increase the pressure of polarized 3He gas for practical applications.

Purpose of the Study:

  • To develop a compact apparatus for compressing spin-polarized 3He gas to higher pressures.
  • To evaluate the effectiveness of the compression method on 3He polarization.
  • To assess the impact of temperature on gas density during compression.

Main Methods:

  • Utilized a modified commercial diaphragm pump for gas compression.
  • Employed metastability-exchange optical pumping (MEOP) to polarize 3He gas at ~0.25 kPa.
  • Compressed the polarized 3He gas into a storage cell at ~100 kPa.
  • Cooled the storage cell to liquid nitrogen temperature during compression.

Main Results:

  • Achieved 20%–35% 3He polarization in pure 3He gas at 100 kPa.
  • Obtained 35%–50% 3He polarization in 3He-4He mixtures at 100 kPa.
  • Increased gas density by a factor of four by cooling the storage cell to liquid nitrogen temperature.

Conclusions:

  • Successfully developed a compact compression apparatus for producing high-pressure nuclear spin-polarized 3He gas.
  • The compression method maintains significant 3He polarization, making it suitable for applications requiring higher gas densities.
  • The use of liquid nitrogen temperature further enhances the utility of the apparatus by increasing gas density.