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<p>In contrast to conventional neutron imaging by measuring the attenuation contrast, polarized-neutron imaging (PNI) has proved to be a powerful tool for investigating the spatial distribution of magnetic fields inside and around bulk samples owing to the intrinsic magnetic moment of neutrons. This technique benefits from the measurement of the cumulative precession of the neutron polarization passing through a magnetic field. We report the recent development of the PNI capability at the China Advanced Research Reactor (CARR), where two neutron imaging instruments (thermal and cold) have been established. To further develop and realize the PNI technique, a PNI facility consisting of a double-crystal pyrolytic graphite monochromator, supermirror polarizer with three parallel V-shaped cavities and an in situ optically pumped <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^3\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>3</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>He neutron spin filter as a neutron spin analyzer was successfully developed and tested based on an established cold neutron imaging instrument. This setup will be beneficial for enhancing neutron imaging and neutron optics in CARR in the future.</p>

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Development of a polarized-neutron imaging technique at the China Advanced Research Reactor

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Zheng-Yao Li,
  • Tian-Hao Wang,
  • Si-Qin Meng,
  • Jun-Pei Zhang,
  • Li-Jie Hao,
  • Jian Tang,
  • Tian-Yun Wang,
  • Shi-Hao Ruan,
  • Hong-Liang Wang,
  • Mei-Mei Wu,
  • Long Tian,
  • Bin Wang,
  • Ahmed Salman,
  • Lin-Feng He,
  • Xin Tong,
  • Dong-Feng Chen

摘要

In contrast to conventional neutron imaging by measuring the attenuation contrast, polarized-neutron imaging (PNI) has proved to be a powerful tool for investigating the spatial distribution of magnetic fields inside and around bulk samples owing to the intrinsic magnetic moment of neutrons. This technique benefits from the measurement of the cumulative precession of the neutron polarization passing through a magnetic field. We report the recent development of the PNI capability at the China Advanced Research Reactor (CARR), where two neutron imaging instruments (thermal and cold) have been established. To further develop and realize the PNI technique, a PNI facility consisting of a double-crystal pyrolytic graphite monochromator, supermirror polarizer with three parallel V-shaped cavities and an in situ optically pumped \(^3\) 3 He neutron spin filter as a neutron spin analyzer was successfully developed and tested based on an established cold neutron imaging instrument. This setup will be beneficial for enhancing neutron imaging and neutron optics in CARR in the future.