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

作　　者：汪晋辰 刘娟娟 徐大业 Florian Grünauer 郝丽杰 刘蕴韬 张红霞 程鹏 鲍威 Jinchen Wang;Juanjuan Liu;Daye Xu;Florian Grünauer;Lijie Hao;Yuntao Liu;Hongxia Zhang;Peng Cheng;Wei Bao(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;Physics Consulting,Zorneding 85604,Germany;China Institute of Atomic Energy,Beijing 102413,China;Department of Physics,City University of Hong Kong,Kowloon 999077,China;Center for Neutron Scattering,City University of Hong Kong,Kowloon 999077,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第5期96-102,共7页中国物理B（英文版）

基　　金：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);the National Key R&D Program of China(Grant No.2023YFA1406500)。

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 3μSv/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 

分 类 号：TL817.3[核科学技术—核技术及应用]