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Fluorocarbon paint on Daya Bay antineutrino detectors

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Science China(Technological Sciences) 2012年第6期55卷 1572-1575页

作者： WANG RuiGuang heng yuekun WANG Lan DING YaYun CAO Jun WANG YiFang YANG ChangGen lnstitut of High Energy Physics Chinese Academy of SciencesBeijing 100049China

The aim of the Daya Bay reactor antineutrino experiment is to determine the neutrino mixing angle 813 with a sensitivity of 0.01 or better at 90% confidence level. In order to improve the position resolution of both the positron interaction and the neu- tron capture, the inside of the antineutrino detectors should be as unreflecting as possible. A black matt fluorocarbon paint is coated on the inner surface of the detectors made of 304L stainless steel to meet the physical requirement. This paint is com- patible with mineral oil, has low radioactivity, is easy to spray and fast curing at normal temperatures. The coating has excel- lent performance such as good adhesive force, uniformity, compact, scratch and wear resistance, and so on. It is the first appli- cation of such paint to large physical devices.

关键词： neutrino detector fluorocarbon paint reflectivity compatibility

Study of imaging unknown objects by cosmic-ray muons

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Radiation Detection Technology and Methods 2021年第2期5卷 192-199页

作者： Mengzhao Li yuekun heng Yifang Wang Kaile Wen Zhiyan Cai Xiaoyu Yang Zhi Wu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Introduction Cosmic-ray muon imaging is a kind of nondestructive detection technology which can be used to detect unknown objects in geological exploration,civil engineering and nuclear *** imaging and scattering tomography schemes are *** The transmission scheme uses a multilayer detector to measure the direction of a cosmic-ray muon passing through an *** scattering scheme involves placing two detectors upstream and downstream of the object to record the incident and exit directions of the muon passing through the *** effect of the detector resolution on the imaging clarity of transmission imaging was *** applicable scenarios of the two schemes were *** The results by calculating show that in the transmission imaging of a hundred-meter object,a spatial resolution of 2.5 m can be achieved,and Cu and Fe can be discriminated with a density difference of 1.1 g/*** tomography is mainly suitable for meter-level objects,which can detect 0.2 m chamber and distinguish 0.05 m heavy metal blocks in rock.

关键词： Cosmic-ray muon imaging Muon Tomography Nondestructive detection

The study of linearity and detection efficiency for 20″photomultiplier tube

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Radiation Detection Technology and Methods 2019年第2期3卷 15-21页

作者： Anbo Yang Zhimin Wang Zhonghua Qin Fengjiao Luo yuekun heng Haiqiong Zhang Meihang Xu Qun Ou Yang Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Background The linearity and photon detection efficiency(PDE)are important parameters of photomultiplier tube(PMT),which need to be precisely measured with suitable *** To search good methods for linearity and PDE study of newly developed 20-inch *** In this paper,we setup a testing system to use the average photoelectrons(P.E.)in pulse mode for linearity measurement with the result corrected for strong *** the PDE measurement,we developed a relative method with a reference PMT whose efficiency is known to compare the measured PDE with both average charge and hit *** The measurements of PMT shows only 5%nonlinearity within 1000 *** good PDE,the result of linearity’s corrected definition is closer to the real status of *** The results show good charge and linearity response for newly developed 20-inch MCP PMT and dynode *** testing techniques discussed in this paper are suitable for the study of PDE and linearity.

关键词： PMT Linearity PDE Charge spectra P.E.

Leakage tests of the stainless steel vessels of the antineutrino detectors in the Daya Bay reactor neutrino experiment

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Science China(Technological Sciences) 2013年第1期56卷 148-151页

作者： CHEN XiaoHui LUO XiaoLan heng yuekun WANG LingShu TANG Xiao MA XiaoYan ZHUANG HongLin BAND Henry R. CHERWINKA Jeff J. XIAO Qiang HEEGER Karsten M. Institute of High Energy Physics Chinese Academy of Sciences University of Wisconsin MadisonWisconsin53706USA

The antineutrino detectors for the Daya Bay reactor neutrino experiment are liquid scintillator detectors designed to detect electron anti-neutrino via inverse beta interactions with high efficiency and low *** the antineutrino detector will be installed and immerged in water Cherenkov detector and will run for 3 to 5 years,water tightness is critical to the successful operation of the antineutrino detectors.A special seal technique was used for this *** leak checking methods have been employed to ensure the seal *** paper describes the sealing method and leakage testing results.

关键词： Daya Bay reactor neutrinos antineutrino detector seal leakage test

Structure design and load test of the small prototype for the JUNO Central Detector

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Radiation Detection Technology and Methods 2022年第4期6卷 439-450页

作者： Xiaoyu Yang yuekun heng Wei He Xiaoyan Ma Lei Yang Jiajie Ling Zhi Wu Kaixi Huang Caishen Wang Ruiting Lei Yatian Pei Xiaohui Qian Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China University of Chinese Academy of Science Beijing 100049China Dongguan University of Technology Dongguan 523808China Sun Yat-Sen University Guangzhou 510275China

Introduction The structure of the Jiangmen Underground Neutrino Observatory(JUNO)CentralDetector(CD)was designed using finite element methods(FEM).The structure of the small JUNOCDprototypewas also designed using the same structural scheme and method as those of the CD,and the load test was carried out after the accomplishment of structure design and *** The load test can help verify the performance and reliability of the mechanical monitoring system and liquid filling system of the CD,verify the consistency of FEM calculations and axial force measurement results of the sensors,and accumulate experience for the installation of the connecting *** The measurement scheme was considered and determined,and the connecting bars’axial forces under different liquid filling conditions were measured and compared with the FEM results,the consistencies of which were *** mechanical monitoring system and liquid filling system of theCDwere verified during the load test,which met the requirements of design and experiment.

关键词： Structure design Load test Numerical analysis Small prototype Central Detector JUNO

The measurement system of acrylic transmittance for the JUNO central detector

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Radiation Detection Technology and Methods 2020年第3期4卷 284-292页

作者： Xiaoyu Yang Nan Li yuekun heng Mengzhao Li Zhiyan Cai Xiaoyan Ma Xiaohui Qian Kaixi Huang Zhi Wu Wei He Yatian Pei Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China University of Chinese Academy of Science Beijing 100049China

Background The Jiangmen Underground Neutrino Observatory(JUNO)has 20 kilo-ton liquid scintillator as target mass contained by a huge acrylic sphere to carry out the research on neutrino *** transmittance is considered as an important optical performance of the JUNO Central Detector as it has a direct relationship to the number of photons detected by the JUNO Central Detector and further affects the energy resolution of *** The transmittance requirement of acrylic spherical panel for the JUNO Central Detector is exceeding 96%at the wavelength of 420 nm in ultrapure water and a specific measurement system was built and studied in Institute of High Energy Physics for this purpose,as the existing equipment cannot perform the sample test in the liquid and support the long sample length of 120 *** After improving the technology of thermoforming,the transmittances of the acrylic spherical panels meet the requirement of JUNO,which guarantees the batch production of acrylic panels on *** design of the measurement system,the constitution of hardware,the development of control and data acquisition software are introduced,and the measurement uncertainty of the system and the transmittance results of the acrylic samples from the spherical panel are discussed in this article.

关键词： Acrylic Optics Transmittance measurement Central detector JUNO

Research on the measurement of connecting bars'axial force of JUNO central detector

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Radiation Detection Technology and Methods 2020年第3期4卷 362-371页

作者： Xiaoyu Yang Lei Yang Wei He Yatian Pei yuekun heng Xiaoyan Ma Huafeng Li Kaixi Huang Caishen Wang Yi Li Xiaohui Qian Zhi Wu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China University of Chinese Academy of Science Beijing 100049China Dongguan University of Technology Dongguan 523808China Beijing Institute of Architectural Design Beijing 100045China

Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy and precisely measure oscillation parameters and study the solar neutrino,supernova neutrino,geo-neutrino,***'s central detector(CD)has 20 kilo-ton liquid scintillator as target mass,which is contained by a huge acrylic sphere with the inner diameter of 35.4 m,and the acrylic sphere is supported by a stainless steel structure through 590 connecting *** Part of the connecting bars bear pull force and the other bars bear push *** is a direct relationship between the stress of connecting bars and that of acrylic *** the installation process of the CD,the pretightening force and axial force of the connecting bars should be monitored with accuracy,and for the filling process and running condition,the precise measurement of axial force can indicate the safety of structure of the *** Statistical method was used to evaluate the performance of measurement schemes,and 4-fiber Bragg grating measurement scheme was determined to be the final scheme,which can get the measurement uncertainty better than 0.7 *** of different measurement schemes are discussed in detail,and some related finite element analysis and evalu-ation method are also introduced in this paper.

关键词： Axial force measuring Mechanical sensor FEA Central detector JUNO

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The progress of BESⅢ

The progress of BESⅢ

Laser measurement system for acrylic transmittance of JUNO central detector

中国物理学会高能物理分会第七届学术年会

作者： yuekun heng Institute of High Energy Physics, CAS, China

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Radiation Detection Technology and Methods 2021年第3期5卷 356-363页

作者： Zhaohan Li Xiaoyu Yang yuekun heng Xiaoyan Ma Xiaohui Qian Kaixi Huang Zhi Wu Wei He Meihang Xu Xiaolan Luo Yatian Pei Mengzhao Li Zhiyan Cai Wenlu Wei Yifang Wang Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China University of Chinese Academy of Science Beijing 100049China

Background During the research phase of acrylic panel for the Jiangmen Underground Neutrino Observatory(JUNO)central detector(CD),the darkroom transmittance measurement system(DTMS)was designed and built,and a massive amount of measurements were carried out to help determine the composition and processing techniques of the acrylic *** The mass production of acrylic panels was started after the pilot *** requirement of transmittance measurement put forward new demands on operation,and a new measurement system was considered to support removable and non-destructive measurement on *** After the accomplishment of design,development and verification were completed,the laser measurement system came into use in the acrylic workshop of Taixing Donchamp Acrylic Ltd,and the transmittance results of acrylic spherical panels met the requirement of *** optical design,tooling design,data processing interface and uncertainty analyses of the laser measurement system are discussed in detail,and the measured transmittance results are also introduced in this article.

关键词： Laser Non-destructive measurement Transmittance JUNO