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arXiv · 2501.01143

Design and construction of the multiplexing cold neutron spectrometer BOYA with double-column Rowland focusing analyzers

Jinchen Wang·Daye Xu·Juanjuan Liu·Wei Luo·Peng Cheng·Hongxia Zhang·Wei Bao
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Abstract

Developing neutron spectrometers with higher counting efficiency has been an essential pursuit in neutron instrumentation. In this work, we present BOYA, a multiplexing cold neutron spectrometers designed and implemented at the China Advanced Research Reactor. Equipped with 34 angular analyzing channels spanning 119{\deg}, each containing 5 inelastic channels and 1 diffraction channel, BOYA enhances the measurement efficiency by two orders of magnitude over a traditional triple-axis spectrometer. To optimize both intensity and energy resolution, innovative double-column Rowland focusing analyzers have been developed. By filling the crystal gaps in the traditional Rowland focusing geometry, our design enhances the neutron beam coverage without introducing appreciable double-scattering. Our commissioning results on vanadium and MnWO4 have confirmed the success of the design, establishing BOYA as a successful multiplexing instrument for neutron spectroscopy.

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Jinchen Wang, Daye Xu, Juanjuan Liu, Wei Luo, Peng Cheng, Hongxia Zhang, Wei Bao. 2025-01-02. Design and construction of the multiplexing cold neutron spectrometer BOYA with double-column Rowland focusing analyzers. https://doi.org/10.1063/5.0256044

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