We fabricated the spheroid neutron diffractometer with 79 neutron detector rings using the transparent rubber sheet type Eu:LiCaAlF6 scintillators and wavelength-shifting fibers.We confirmed that the fabricated detect...We fabricated the spheroid neutron diffractometer with 79 neutron detector rings using the transparent rubber sheet type Eu:LiCaAlF6 scintillators and wavelength-shifting fibers.We confirmed that the fabricated detector shows a clear neutron peak and can discriminate neutron and gamma-ray events in a signal pulse spectrum.We additionally checked that the fabricated diffractometer can detect a neutron diffraction peak of ferrite powder at Kyoto University Accelerator-driven Neutron Source.Consequently,it can be expected that crystal structural analysis will be possible even by small accelerator neutron sources.展开更多
The time-of-flight high-resolution neutron diffractometer(TREND)at the China Spallation Neutron Source(CSNS)has been successfully equipped with a large-area^(3)He tube array neutron detector,designed to achieve except...The time-of-flight high-resolution neutron diffractometer(TREND)at the China Spallation Neutron Source(CSNS)has been successfully equipped with a large-area^(3)He tube array neutron detector,designed to achieve exceptional resolution and uniformity.The detector system,comprising 14 banks and 134 modules with 1376^(3)He tubes,is optimized for highangle and medium-to-low-angle measurements.Advanced dual-end readout electronics ensure precise charge and timeof-flight measurements,while rigorous performance testing confirmed the system’s spatial resolution and uniformity.Insitu testing using polyethylene samples validated the detector’s operational stability,with counting rate deviations within 3.7%.The system also demonstrated excellent two-dimensional imaging capabilities and adaptability to various neutron wavelength ranges through harmonic division techniques.These results highlight the TREND detector system as a robust and versatile tool for high-resolution neutron diffraction studies.展开更多
The first neutron texture diffractometer in China has been built at the China Advanced Research Reactor,due to strong demand for texture measurement with neutrons from the domestic user community. This neutron texture...The first neutron texture diffractometer in China has been built at the China Advanced Research Reactor,due to strong demand for texture measurement with neutrons from the domestic user community. This neutron texture diffractometer has high neutron intensity, moderate resolution and is mainly applied to study texture in commonly used industrial materials and engineering components. In this paper, the design and characteristics of this instrument are described. The results for calibration with neutrons and quantitative texture analysis of zirconium alloy plate are presented. The comparison of texture measurements with the results obtained in HIPPO at LANSCE and Kowari at ANSTO illustrates the reliability of the texture diffractometer.展开更多
文摘We fabricated the spheroid neutron diffractometer with 79 neutron detector rings using the transparent rubber sheet type Eu:LiCaAlF6 scintillators and wavelength-shifting fibers.We confirmed that the fabricated detector shows a clear neutron peak and can discriminate neutron and gamma-ray events in a signal pulse spectrum.We additionally checked that the fabricated diffractometer can detect a neutron diffraction peak of ferrite powder at Kyoto University Accelerator-driven Neutron Source.Consequently,it can be expected that crystal structural analysis will be possible even by small accelerator neutron sources.
基金supported by the National Natural Science Foundation of China through the Young Fund Project titled“Research on Polarized Neutron Detector System”(Project Approval No.12205326)support was provided by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2023B0303000003)the Guangdong Provincial Key Laboratory of Advanced Particle Detection Technology(Grant No.2024B1212010005).
文摘The time-of-flight high-resolution neutron diffractometer(TREND)at the China Spallation Neutron Source(CSNS)has been successfully equipped with a large-area^(3)He tube array neutron detector,designed to achieve exceptional resolution and uniformity.The detector system,comprising 14 banks and 134 modules with 1376^(3)He tubes,is optimized for highangle and medium-to-low-angle measurements.Advanced dual-end readout electronics ensure precise charge and timeof-flight measurements,while rigorous performance testing confirmed the system’s spatial resolution and uniformity.Insitu testing using polyethylene samples validated the detector’s operational stability,with counting rate deviations within 3.7%.The system also demonstrated excellent two-dimensional imaging capabilities and adaptability to various neutron wavelength ranges through harmonic division techniques.These results highlight the TREND detector system as a robust and versatile tool for high-resolution neutron diffraction studies.
基金Supported by National Nature Science Foundation of China(11105231,11205248,51327902)International Atomic Energy Agency-TC program(CPR0012)
文摘The first neutron texture diffractometer in China has been built at the China Advanced Research Reactor,due to strong demand for texture measurement with neutrons from the domestic user community. This neutron texture diffractometer has high neutron intensity, moderate resolution and is mainly applied to study texture in commonly used industrial materials and engineering components. In this paper, the design and characteristics of this instrument are described. The results for calibration with neutrons and quantitative texture analysis of zirconium alloy plate are presented. The comparison of texture measurements with the results obtained in HIPPO at LANSCE and Kowari at ANSTO illustrates the reliability of the texture diffractometer.
