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A Compact in situ Polarized 3He System for Neutron Scattering

  • 1 Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China;

  • 2 Spallation Neutron Source Science Center, Dongguan 523803, China;

  • 3 University of Chinese Academy of Sciences, Beijing 100049, China;

  • 4 Guangdong Provincial Key Laboratory of Extreme Conditions, Dongguan 523803, China;

  • 5 Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;

  • 6 Jülich Centre for Neutron Science at MLZ, Lichtenbergstr. 1, 85747 Garching, Germany

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  • Corresponding author:

    Junpei Zhang, Email: zhangjunpei@ihep.ac.cn

    Xin Tong, Email: tongxin@ihep.ac.cn

  • Received Date: October 14, 2024
  • Accepted Date: January 12, 2025
  • Published Date: January 31, 2025
    Abstract
  • This study investigates the performance of a new compact (55cm×56cm×48cm) in situ spin-exchange optical pumping 3He neutron spin filter (NSF) system developed at the China Spallation Neutron Source. The enclosed NSF cell, filled with 3He at 2.53 bar, achieved an initial 3He polarization of approximately 60%. After subsequent improvements in the magnetic field and heating system, this in situ system achieved a 3He polarization of 75.66, resulting in 96.30% neutron polarization at 2 Å. This highly compact in situ system is equipped with self-supportive features, pre-pumping capabilities, polarization maintenance, and a low-noise nuclear magnetic resonance system. These advantages significantly reduce the preparation time and simplify polarized neutron experiments, making it suitable for various neutron beamlines in China, particularly those with a limited sample space. These characteristics establish it as a quasi-standardized system that plays a vital role in polarized neutron experiments, including those involving polarized neutron imaging, neutron reflection, the performance calibration of polarized neutron instruments, and the neutron optics parity and time reversal experiment.
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