Physical design of cold neutron direct geometry inelastic spectrometer at China Spallation Neutron Source
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| Format: | Preprint |
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2026
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| _version_ | 1866910207673630720 |
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| author | Zhao, Qian Zhang, Xiaowen Xiao, Songwen Luo, Wei Qin, Zecong Xu, Zhuang Feng, Yu Tong, Xin |
| author_facet | Zhao, Qian Zhang, Xiaowen Xiao, Songwen Luo, Wei Qin, Zecong Xu, Zhuang Feng, Yu Tong, Xin |
| contents | The Cold-Neutron Inelastic Spectrometer (CNIS) is a direct-geometry, time-of-flight instrument designed for China Spallation Neutron Source (CSNS) and optimized to probe low-energy lattice and magnetic excitations. The instrument integrates a long flight path with bent supermirror guides and an elliptical-focusing geometry to suppress high-energy background while improving cold-neutron delivery to the sample. A flexible multi-disk chopper suite provides pulse shaping, band selection and monochromatization, enabling multi-$E_\textrm{i}$ operation. Modular features, including an interchangeable high-focusing guide insert, radial collimation and a vacuum ``airbox'' for simplified sample-environment integration, enhance signal-to-noise and operational versatility. Through combined flight-path and chopper optimization, CNIS achieves excellent routine-mode energy resolution and can reach approximately $\sim 1\%$ in a dedicated high-resolution configuration. CNIS is planned to commence user operation in 2029, offering a highly flexible platform for cold-neutron inelastic scattering studies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_09980 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Physical design of cold neutron direct geometry inelastic spectrometer at China Spallation Neutron Source Zhao, Qian Zhang, Xiaowen Xiao, Songwen Luo, Wei Qin, Zecong Xu, Zhuang Feng, Yu Tong, Xin Applied Physics Instrumentation and Detectors The Cold-Neutron Inelastic Spectrometer (CNIS) is a direct-geometry, time-of-flight instrument designed for China Spallation Neutron Source (CSNS) and optimized to probe low-energy lattice and magnetic excitations. The instrument integrates a long flight path with bent supermirror guides and an elliptical-focusing geometry to suppress high-energy background while improving cold-neutron delivery to the sample. A flexible multi-disk chopper suite provides pulse shaping, band selection and monochromatization, enabling multi-$E_\textrm{i}$ operation. Modular features, including an interchangeable high-focusing guide insert, radial collimation and a vacuum ``airbox'' for simplified sample-environment integration, enhance signal-to-noise and operational versatility. Through combined flight-path and chopper optimization, CNIS achieves excellent routine-mode energy resolution and can reach approximately $\sim 1\%$ in a dedicated high-resolution configuration. CNIS is planned to commence user operation in 2029, offering a highly flexible platform for cold-neutron inelastic scattering studies. |
| title | Physical design of cold neutron direct geometry inelastic spectrometer at China Spallation Neutron Source |
| topic | Applied Physics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2605.09980 |