Design of the neutron slit package for Femi chopper prototype of CSNS
BackgroundFermi chopper is the key equipment for monochromating the neutron beam in an inelastic neutron scattering spectrometer, and its performance will affect the resolution and counting rate of the spectrometer. The core component of Fermi chopper is neutron slit package, which is composed of ne...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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Science Press
2021-05-01
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| Series: | He jishu |
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| Online Access: | http://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2021.hjs.44.050201&lang=zh |
| _version_ | 1811169602792587264 |
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| author | GUO Juan CAI Weiliang GENG Yansheng WANG Ping ZHANG Hong |
| author_facet | GUO Juan CAI Weiliang GENG Yansheng WANG Ping ZHANG Hong |
| author_sort | GUO Juan |
| collection | DOAJ |
| description | BackgroundFermi chopper is the key equipment for monochromating the neutron beam in an inelastic neutron scattering spectrometer, and its performance will affect the resolution and counting rate of the spectrometer. The core component of Fermi chopper is neutron slit package, which is composed of neutron absorbing material and transparent material, and selects multiple single wavelength pulsed neutrons by high-speed rotation.PurposeThe study aims to design suitable slit packages for Fermi chopper prototype of China spallation neutron source (CSNS).MethodsAccording to the common experimental conditions of inelastic scattering, the development target of the Fermi chopper prototype was determined, then three typical slit packages were designed, and the feasibility of the design was verified by MCStas software simulation.ResultsThe simulation results show that: (1) the three kinds of slits can achieve a resolution of 2%~10% in the wavelength range of 0.02~0.50 nm, and the neutron decay rate and the slit packet transmittance meets the requirements; (2) the optimal incident wavelengths of the three kinds of slit packets at 600 Hz operating frequency are 0.165 nm, 0.040 nm and 0.023 nm respectively, which can be used in different wavelength ranges; (3) in the long wavelength band with better resolution, the slit packet can be used to reduce the velocity and improve the neutron pass rate.ConclusionsThe physical parameters for the prototype development of CSNS Fermi chopper are given by this study, it provides a reference for the slit package performance test of the future prototype, as well as the design of the neutron slit package of the Fermi chopper of the inelastic scattering spectrometer. |
| first_indexed | 2024-04-10T16:46:15Z |
| format | Article |
| id | doaj.art-27caf664c55a456b8ce1f1cec7daeeee |
| institution | Directory Open Access Journal |
| issn | 0253-3219 |
| language | zho |
| last_indexed | 2024-04-10T16:46:15Z |
| publishDate | 2021-05-01 |
| publisher | Science Press |
| record_format | Article |
| series | He jishu |
| spelling | doaj.art-27caf664c55a456b8ce1f1cec7daeeee2023-02-08T00:41:58ZzhoScience PressHe jishu0253-32192021-05-0144505020105020110.11889/j.0253-3219.2021.hjs.44.0502010253-3219（2021）05-0009-08Design of the neutron slit package for Femi chopper prototype of CSNSGUO Juan0CAI Weiliang1GENG Yansheng2WANG Ping3ZHANG Hong4College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaBackgroundFermi chopper is the key equipment for monochromating the neutron beam in an inelastic neutron scattering spectrometer, and its performance will affect the resolution and counting rate of the spectrometer. The core component of Fermi chopper is neutron slit package, which is composed of neutron absorbing material and transparent material, and selects multiple single wavelength pulsed neutrons by high-speed rotation.PurposeThe study aims to design suitable slit packages for Fermi chopper prototype of China spallation neutron source (CSNS).MethodsAccording to the common experimental conditions of inelastic scattering, the development target of the Fermi chopper prototype was determined, then three typical slit packages were designed, and the feasibility of the design was verified by MCStas software simulation.ResultsThe simulation results show that: (1) the three kinds of slits can achieve a resolution of 2%~10% in the wavelength range of 0.02~0.50 nm, and the neutron decay rate and the slit packet transmittance meets the requirements; (2) the optimal incident wavelengths of the three kinds of slit packets at 600 Hz operating frequency are 0.165 nm, 0.040 nm and 0.023 nm respectively, which can be used in different wavelength ranges; (3) in the long wavelength band with better resolution, the slit packet can be used to reduce the velocity and improve the neutron pass rate.ConclusionsThe physical parameters for the prototype development of CSNS Fermi chopper are given by this study, it provides a reference for the slit package performance test of the future prototype, as well as the design of the neutron slit package of the Fermi chopper of the inelastic scattering spectrometer.http://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2021.hjs.44.050201&lang=zhfermi chopperslit packagemonochromatic neutronresolutionneutron pass rate |
| spellingShingle | GUO Juan CAI Weiliang GENG Yansheng WANG Ping ZHANG Hong Design of the neutron slit package for Femi chopper prototype of CSNS He jishu fermi chopper slit package monochromatic neutron resolution neutron pass rate |
| title | Design of the neutron slit package for Femi chopper prototype of CSNS |
| title_full | Design of the neutron slit package for Femi chopper prototype of CSNS |
| title_fullStr | Design of the neutron slit package for Femi chopper prototype of CSNS |
| title_full_unstemmed | Design of the neutron slit package for Femi chopper prototype of CSNS |
| title_short | Design of the neutron slit package for Femi chopper prototype of CSNS |
| title_sort | design of the neutron slit package for femi chopper prototype of csns |
| topic | fermi chopper slit package monochromatic neutron resolution neutron pass rate |
| url | http://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2021.hjs.44.050201&lang=zh |
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