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 spectrometer designed and implemented at the China Advanced Research Reactor. Equipped
with 34 angular analyzing channels spanning 119○, 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.
Read more at Review of Scientific Instruments:
https://pubs.aip.org/aip/rsi/article-abstract/96/7/073902/3351709/Design-and-construction-of-the-multiplexing-cold?redirectedFrom=fulltext
Photo caption:
(a) Design diagram and (b) actual photograph of the BOYA instrument. The CARR cold neutron guide A (CNGA), monochromator (M) with its liftable shielding structure, sample stage (S), and multi-analyzer–detector-system (MADS) are indicated. The direction of the neutron beam in the guide is marked with a colored arrow in (a).
07 Jul 2025
