中国物理B ›› 2024, Vol. 33 ›› Issue (5): 57801-057801.doi: 10.1088/1674-1056/ad3629

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Design and implementation of the monochromator shielding for the cold neutron spectrometers XINGZHI and BOYA

Jinchen Wang(汪晋辰)1,†, Juanjuan Liu(刘娟娟)1,†, Daye Xu(徐大业)1, Florian Grünauer2, Lijie Hao(郝丽杰)3, Yuntao Liu(刘蕴韬)3, Hongxia Zhang(张红霞)1,‡, Peng Cheng(程鹏)1,§, and Wei Bao(鲍威)1,4,5,¶   

  1. 1 Laboratory for Neutron Scattering and Beijing Key Laboratory of Optoelectronic Functional Materials and MicroNano Devices, Department of Physics, Renmin University of China, Beijing 100872, China;
    2 Physics Consulting, Zorneding 85604, Germany;
    3 China Institute of Atomic Energy, Beijing 102413, China;
    4 Department of Physics, City University of Hong Kong, Kowloon 999077, China;
    5 Center for Neutron Scattering, City University of Hong Kong, Kowloon 999077, China
  • 收稿日期:2023-12-27 修回日期:2024-02-16 接受日期:2024-03-21 出版日期:2024-05-20 发布日期:2024-05-20
  • 通讯作者: Hongxia Zhang, Peng Cheng, Wei Bao E-mail:hxzhang@ruc.edu.cn;pcheng@ruc.edu.cn;weibao@cityu.edu.hk
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12004426, U2030106, and 12304185), the National Key Scientific Instrument and Equipment Development Project of NSFC (Grant No. 11227906), and the National Key R&D Program of China (Grant No. 2023YFA1406500).

Design and implementation of the monochromator shielding for the cold neutron spectrometers XINGZHI and BOYA

Jinchen Wang(汪晋辰)1,†, Juanjuan Liu(刘娟娟)1,†, Daye Xu(徐大业)1, Florian Grünauer2, Lijie Hao(郝丽杰)3, Yuntao Liu(刘蕴韬)3, Hongxia Zhang(张红霞)1,‡, Peng Cheng(程鹏)1,§, and Wei Bao(鲍威)1,4,5,¶   

  1. 1 Laboratory for Neutron Scattering and Beijing Key Laboratory of Optoelectronic Functional Materials and MicroNano Devices, Department of Physics, Renmin University of China, Beijing 100872, China;
    2 Physics Consulting, Zorneding 85604, Germany;
    3 China Institute of Atomic Energy, Beijing 102413, China;
    4 Department of Physics, City University of Hong Kong, Kowloon 999077, China;
    5 Center for Neutron Scattering, City University of Hong Kong, Kowloon 999077, China
  • Received:2023-12-27 Revised:2024-02-16 Accepted:2024-03-21 Online:2024-05-20 Published:2024-05-20
  • Contact: Hongxia Zhang, Peng Cheng, Wei Bao E-mail:hxzhang@ruc.edu.cn;pcheng@ruc.edu.cn;weibao@cityu.edu.hk
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12004426, U2030106, and 12304185), the National Key Scientific Instrument and Equipment Development Project of NSFC (Grant No. 11227906), and the National Key R&D Program of China (Grant No. 2023YFA1406500).

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摘要： An innovative monochromator shielding is designed and implemented for the cold neutron spectrometers XINGZHI and BOYA operated by Renmin University of China at China Advanced Research Reactor. Via Monte Carlo simulations and careful mechanical designs, a shielding configuration has been successfully developed to satisfy safety requirements of below 3 μSv/h dose rate at its exterior, meanwhile fulfilling space, floor load and nonmagnetic requirements. Composite materials are utilized to form the sandwich-type shielding walls: the inner layer of boron carbide rubber, the middle layer of steel-encased lead and the outer layer of borated polyethylene. Special-shaped liftable shielding blocks are incorporated to facilitate a continuous adjustment of the neutron energy while preventing radiation leakage. Our work has demonstrated that by utilizing composite shielding materials, along with the sandwich structure and liftable shielding blocks, a compact and lightweight shielding solution can be achieved. This enables the realization of advanced neutron scattering instruments that provide expanded space of measurement, larger energy and momentum coverage, and higher flux on the sample. This shielding represents the first of its kind in neutron scattering instruments in China. Following its successful operation, it has been subsequently employed by other neutron instruments across the country.

关键词: neutron scattering, cold neutron spectrometer, monochromator shielding, sandwich shielding structure

Abstract: An innovative monochromator shielding is designed and implemented for the cold neutron spectrometers XINGZHI and BOYA operated by Renmin University of China at China Advanced Research Reactor. Via Monte Carlo simulations and careful mechanical designs, a shielding configuration has been successfully developed to satisfy safety requirements of below 3 μSv/h dose rate at its exterior, meanwhile fulfilling space, floor load and nonmagnetic requirements. Composite materials are utilized to form the sandwich-type shielding walls: the inner layer of boron carbide rubber, the middle layer of steel-encased lead and the outer layer of borated polyethylene. Special-shaped liftable shielding blocks are incorporated to facilitate a continuous adjustment of the neutron energy while preventing radiation leakage. Our work has demonstrated that by utilizing composite shielding materials, along with the sandwich structure and liftable shielding blocks, a compact and lightweight shielding solution can be achieved. This enables the realization of advanced neutron scattering instruments that provide expanded space of measurement, larger energy and momentum coverage, and higher flux on the sample. This shielding represents the first of its kind in neutron scattering instruments in China. Following its successful operation, it has been subsequently employed by other neutron instruments across the country.

Key words: neutron scattering, cold neutron spectrometer, monochromator shielding, sandwich shielding structure

中图分类号:  (Neutron inelastic scattering)

  • 78.70.Nx
75.25.-j (Spin arrangements in magnetically ordered materials (including neutron And spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)) 29.30.Hs (Neutron spectroscopy) 28.20.-v (Neutron physics)