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Research on thermoforming process of JUNO large acrylic spherical panel

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Radiation Detection Technology and Methods 2022年第1期6卷 122-128页

作者： Xiao-Hui Qian Xiao-Yan Ma yue-kun heng Jian-Xia Xiao yue-Sheng Tang Gao-Feng Zhang Wei Cheng Xiao-Long Wang Wei He Ya-Tian Pei Xiao-Yu Yang Shao-Jing Hou Institute of High Energy Physics Chinese Academy of ScienceBeijing 100049China University of Chinese Academy of Science Beijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China Jiangsu Domchamp New Material Technology Co. LtdTaixing City 225400China

Introduction Jiangmen Underground Neutrino Observation(JUNO)focuses on determining neutrino mass hierarchy and other physical *** central detector is one of the keys to the *** main structure of the central detector is an acrylic spherical container with a diameter of 35.4 m,which will be the largest acrylic spherical vessel in the *** construction will inevitably face many great challenges and *** The thermoforming process of large acrylic spherical panel is introduced,which is a very important step in panel *** effect of temperature on the curvature of panel during thermoforming is *** thermal deformation of panel in thermoforming process is analyzed by finite element *** bending experiment and curvature measurement are carried out,and the influence of deformation of the panel under gravity on the curvature of the panel is *** The current thermoforming process makes the curvature of panel smaller than that of *** measurement results show that the curvatures are different due to the influence of gravity when the panel is placed on the mold or *** suggestions for improving the shape of spherical panels are put *** the thermoforming process,the temperature of the concave-convex surfaces of the panel should be controlled at the same level as far as *** feasible method is to increase the radius of the forming mold to obtain a spherical panel with designed radius.

关键词： JUNO Acrylic spherical vessel Thermoforming process Measurement of spherical panel Panel curvature

The offline data quality monitoring of the BESIII end-cap TOF system

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Radiation Detection Technology and Methods 2021年第2期5卷 207-212页

作者： Ming-Ming Ma Jing-Yi Liu Shuo-Pin Wen Sheng-Sen Sun Chun-Xiu Liu Yong-Zhao Sun Zi-Yan Deng Ye Yuan Hong-Liang Dai Zhi Wu yue-kun heng Huai-Min Liu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049People’s Republic of China

Background The end-cap time-of-flight(TOF)at Beijing Spectrometer was upgraded with multi-gap resistive plate chamber technology in order to improve the particle identification capability in *** offline data quality monitoring(ODQM)is a critical aspect of the data processing chain aiming at providing data with good quality for physics *** An ODQM tool for upgraded end-cap TOF has been developed to provide feedback about the functioning and performance of detector hardware and data processing *** information and reconstructed time-of-flight characteristics of charged tracks are filled into plots using full Bhabha events’reconstruction results,and then,these plots are used to assess the operational conditions of the detector and the quality of the data by the *** This paper describes the design and the content of performance of the ODQM of end-cap TOF and the data quality performance achieved during the last 2-year physical data taking.

关键词： Offline data quality monitoring Time-of-flight MRPC BESIII

The study of time calibration for upgraded end cap TOF of BESIII

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Radiation Detection Technology and Methods 2017年第2期1卷 51-56页

作者： Ying-Xiao Guo Sheng-Sen Sun Fen-Fen An Rong-Xing Yang Ming Zhou Zhi Wu Hong-Liang Dai yue-kun heng Cheng Li Zi-Yan Deng Huai-Min Liu Wei-Guo Li Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China University of Science and Technology of China Hefei 230026China State Key Laboratory of Particle Detection and Electronics Beijing 100049China

Purpose The end cap time of flight at Beijing Spectrometer is upgraded with multi-gap resistive plate chamber technology in order to improve the charged particle identification *** time-over-threshold is used for the time slewing correction instead of the signal *** The correlation of the multi-peak time-over-threshold and the hit position along the strip of the charged particle is *** of the off-line data calibration method is discussed in *** and conclusion The overall time resolution for pions with momentum around 0.8 GeV/c is about 65 ps.

关键词： Time calibration Time of flight MRPC BESIII

The offline data quality monitoring of the BESIII end cap TOF system

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Radiation Detection Technology and Methods 2019年第4期3卷 5-11页

作者： Ming-Ming Ma Jing-Yi Liu Shuo-Pin Wen Sheng-Sen Sun Chun-Xiu Liu Yong-Zhao Sun Zi-Yan Deng Ye Yuan Hong-Liang Dai Zhi Wu yue-kun heng Huai-Min Liu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China

Purpose The end cap time of flight(TOF)at Beijing spectrometer was upgraded with multi-gap resistive plate chamber technology in order to improve the particle identification capability in *** offline data quality monitoring is a critical aspect of the data processing chain aiming at providing data with good quality for physics *** An offline data quality monitoring tool for upgraded end cap TOF has been developed to provide feedback about the functioning and performance of detector hardware and data processing *** Detector information and reconstructed time-of-flight characteristics of charged tracks are filled into plots using full Bhabha events reconstruction results,and then,these plots are used to assess the operational conditions of the detector and the quality of the data by the *** This paper is describing the design and the content of performance of the offline data quality monitoring of end cap TOF and the data quality performance achieved during last 2 years’physical data taking.

关键词： Offline data quality monitoring Time of flight MRPC BESIII

Characterization of 3-inch photomultiplier tubes for the JUNO central detector

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Radiation Detection Technology and Methods 2019年第1期3卷 36-43页

作者： Nan Li yue-kun heng Miao He Ji-lei Xu Xuan-tong Zhang Chuan-ya Cao Zhi Wu Feng-jiao Luo Zhi-min Wang Xiao-yu Yang Mei-hang Xu Zhong-hua Qin Yu-zhen Yang Bao-jun Yan Shu-lin Liu State Key Laboratory of Particle Detection and Electronics Beijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Science Beijing 100049China

Background Jiangmen Underground Neutrino Observation(JUNO)is one of the largest experimental facilities for neutrino *** its main structure,the central detector contains 20 kiloton liquid scintillator filled in an acrylic shell,and there are 18,00020-inch photomultiplier tubes(PMTs)and 25,0003-inch PMTs covering the *** As an independent photon detection system,3-inch PMTs have been required to have excellent resolution for the single photoelectron detection,high quantum efficiency,small transit time spread and low dark noise *** Two kinds of 3-inch PMTs from HZC Photonics and Hamamatsu have been investigated as candidates.A dedicated test system for 3-inch PMTs has been designed,and various characterization parameters have been *** The preliminary results show these PMTs can meet the requirements of JUNO.

关键词： PMT JUNO SPE Quantum efficiency Transit time spread Dark noise

Silk damping in scalar-induced gravitational waves: a novel probe for new physics

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： Yan-heng Yu Sai Wang Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

Aging behavior of large area MCP–PMT

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Nuclear Science and Techniques 2016年第2期27卷 136-140页

作者： Wen-Wen Wang Sen Qian Ming Qi Jing-Kai Xia Ya-Ping Cheng Zhe Ning yue-kun heng Shu-Lin Liu Shu-Guang Si Jian-Ning Sun Dong Li Xing-Chao Wang Guo-Rui Huang Jing-Shou Tian Yong-Lin Wei Hu-Lin Liu Wei-Hua Li Xing Wang Li-Wei Xin Nanjing University Nanjing 210093 China State Key Laboratory of Particle Detection and Electronics(Institute of High Energy Physics CAS) Beijing 100049China Institute of High Energy Physics Chinese Academy of Science Beijing 100049 China University of Chinese Academy of Sciences Beijing China Nanjing North Night Vision Tech. Ltd. Nanjing 211106China Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068 China

The Institute of High Energy Physics, Chinese Academy of Sciences have designed a new type of photomultiplier tube(PMT) based on microchannel plates(MCPs) with large area photocathode, known as large area microchannel plate photomultiplier tube(MCP–PMT). The aging characteristics of the large area MCP–PMTs are different from dynode PMTs and small proximity-focus MCP–PMT. In this work, a prototype large area MCP–PMT was aged by operating with nearly 1000 photoelectrons per pulse for 3 months, and aging process of the MCP–PMT was discussed based on the aging curve.

关键词： MCP-PMT 面积老化行为光电倍增管高能物理研究所微通道板中国科学院近贴聚焦

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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao heng Zheng Runsheng Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

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Boosting hydrocarbon conversion via Cu-doping induced oxygen vacancies on CeO2 in CO2 electroreduction

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Journal of Energy Chemistry 2025年第1期100卷 66-76页

作者： Lei Xue Tong Shi Chenhui Han heng Zhang Fenrong Liu Haorun Li Yan Wang Xiaojun Gu Shanghong Zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical Engineering Inner Mongolia University State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Institute of Catalysis Department of Chemistry Zhejiang University National Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare Earths

Conversion of CO2back to hydrocarbons is the most direct way of closing the“carbon cycle”,and its significance is further enlarged if this process is driven by renewable energies such as ***,precisely controlling the product selectivity towards hydrocarbons against the competitive hydrogen evolution remains challenging,especially for Cu-based ***,we report a novel defect engineering strategy,by which Cu-doping-induced oxygen vacancies on CeO2nanorods were effectively created,with adjustable vacancy/Cu *** resulting optimum catalyst shows up to 79% catalytic current density to hydrocarbons （excluding CO）,with 49% faradaic efficiency to *** and density functional theory unveil that the ratio between oxygen vacancy and Cu affects significantly the formation of*CHO and activation of H2O,which leads to the following deep hydrogenation to *** findings may spur new insights for designing and developing more controllable chemical process relevant to CO2utilization.

关键词： Nanorods