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arXiv · 2501.13647

Polarization-Analyzed Small-Angle Neutron Scattering with an $\textit{in-situ}$ $^{3}$He neutron spin filter at the China Spallation Neutron Source

Long Tian·Han Gao·Tianhao Wang·Haiyun Teng·Jian Tang·Qingbo Zheng·Taisen Zuo·Tengfei Cui·Bin Wang·Xu Qin·Yongxiang Qiu·Yuchen Dong·Yujie Zheng·Zecong Qin·Zehua Han·Junpei Zhang·He Cheng·Xin Tong
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Abstract

Polarization-analyzed small-angle neutron scattering (PASANS) is an advanced technique that enables the selective investigation of magnetic scattering phenomena in magnetic materials and distinguishes coherent scattering obscured by incoherent backgrounds, making it particularly valuable for cutting-edge research. The successful implementation of PASANS in China was achieved for the first time at the newly commissioned Very Small Angle Neutron Scattering (VSANS) instrument at the China Spallation Neutron Source (CSNS). This technique employs a combination of a double-V cavity supermirror polarizer and a radio frequency (RF) neutron spin flipper to manipulate the polarization of the incident neutrons. The scattered neutron polarization is stably analyzed by a specially designed $\textit{in-situ}$ optical pumping $^{3}$He neutron spin filter, which covers a spatially symmetric scattering angle coverage of about 4.8 $^{\circ}$. A comprehensive PASANS data reduction method, aimed at pulsed neutron beams, has been established and validated with a silver behenate powder sample, indicating a maximum momentum transfer coverage of approximately 0.25 {\AA} $^{-1}$.

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Long Tian, Han Gao, Tianhao Wang, Haiyun Teng, Jian Tang, Qingbo Zheng, Taisen Zuo, Tengfei Cui, Bin Wang, Xu Qin, Yongxiang Qiu, Yuchen Dong, Yujie Zheng, Zecong Qin, Zehua Han, Junpei Zhang, He Cheng, Xin Tong. 2025-01-23. Polarization-Analyzed Small-Angle Neutron Scattering with an $\textit{in-situ}$ $^{3}$He neutron spin filter at the China Spallation Neutron Source. https://arxiv.org/abs/2501.13647

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