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A large-area GEM detector using a novel self-stretching technique

Chinese Physics C 2015年第4期39卷 51-54页

作者：尤文豪周意李澄陈宏芳邵明孙勇杰唐泽波刘建北 State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China

A Gas Electron Multiplier （GEM） detector with an effective area of 300 mm×300 mm has been constructed using a novel self-stretching technique, which allows a highly flexible and efficient GEM detector assembly free of glue or spacers. This makes the re-opening and repair of the GEM detectors possible and significantly reduces the scrap rate in the mass production of large-area GEM detectors. With the technique, the assembly time can be limited to a few hours, a factor of ten improvement compared to that using gluing techniques. The details of design and assembly procedure of the 300 mm×300 mm GEM detector are described in this paper. This detector was tested with 8 keV X-rays for the effective gain, energy resolution and performance uniformity. The results show that the typical energy resolution is 20% at an effective gain of about 10-4, with fairly good uniformity.

关键词： GEM self-stretching effective gas gain energy resolution uniformity

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Magnetic shielding for DAMPE electromagnetic calorimeter PMTs

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Chinese Physics C 2014年第8期38卷 53-56页

作者：王培龙张云龙汪晓莲许咨宗 State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China

The magnetic characteristics of R5610A-01 photomultiplier tubes are studied in this paper. The experimental data shows that the gain of R5610A-01 loses about 53% when the magnetic field is 3 Gs along its ＋X axis. A cylinder of one-layer permalloy strip is able to reduce the effect of a 3 Gs magnetic field on the PMT gain to less than 1%.

关键词： photomultiplier tube magnetic shield characteristics

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F-μbond length andμSR depolarization spectrum calculation for fluoride using two-component density functional theory

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Chinese Physics B 2023年第8期32卷 120-123页

作者：潘智康邓力潘子文原钺张宏俊叶邦角 State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China

First-principles calculation of muons in ionic fluorides has been proposed ***,there is a considerable difference between the obtained F-μbond length and the experimental data obtained by muon spin relaxation(μSR).Considering that the difference may be caused by ignoring the quantum effect of muons,we use two-component density functional theory(TCDFT)to consider the quantized muon and recalculate the bond length and theμSR depolarization *** testing several muon-electron correlation,we show that TCDFT can give better results than the commonly used“DFT+μ”.

关键词： muon spin relaxation/rotation fluoride density-functional theory

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Detector design proposal for a cosmic magnetic monopole search experiment

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Physical Review D 2025年第2期111卷 023020-023020页

作者： Changqing Ye Beige Liu Zhe Cao Lingzhi Han Xinming Huang Min Jiang Dong Liu Qing Lin Shitian Wan State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China Deep Space Exploration Laboratory Hefei 230022 China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China CAS Key Laboratory of Microscale Magnetic Resonance University of Science and Technology of China Hefei 230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China

A magnetic monopole is a well-motivated class of beyond-Standard-Model particles that could provide insights into the long-standing puzzle of the quantization of electric charge. These hypothetical particles are likely to be super heavy (∼1015 GeV) and may have been produced during the very early stages of the Universe’s evolution. We propose a novel detection scenario for the search for such cosmic magnetic monopoles, utilizing a hybrid approach that combines radio-frequency atomic magnetometers and plastic scintillators. Such a setup allows one to detect both the induction and scintillation signals of monopoles with velocities larger than about 10−6 light speed (assuming a signal-to-noise ratio of ∼4) and their masses larger than approximately 107 GeV (at β∼10−3). The proposed detector design has the potential to be scaled up to large areas, enabling the exploration of the parameter space of the cosmic magnetic monopoles beyond the current experimental and astrophysical constraints. It is estimated that such a detector can reach the current most stringent limits on the flux set by previous searches, with a signal-to-noise ratio of the induction signal larger than about 4.5, assuming an effective exposure being 20,000 year· m2 and at least three coil layers.

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Regulated Second-sphere Coordination in Amorphous Metal-organic Framework for Efficient CO₂ Fixation

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Angewandte Chemie - International Edition 2025年 e202506960页

作者： Wang, Hang Liu, Yi Li, Lei Zhang, Jing Luo, Mi Sun, Zhixin Xiao, Yuxin Zhai, Xingwu Wu, Liang Zhang, Hongjun Ye, Bangjiao Yang, Cheng Zhang, Xiaodong Zhou, Min Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Hefei 230026 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 China Research School of Chemistry Australian National University Canberra 2601 ACT Australia

The endeavor toward photocatalytic CO2 fixation is largely hampered by the rigid spatial configurations and inadequate orbital overlap between the catalytic site and CO2. Herein, we propose a second-sphere coordinatio... 详细信息

The endeavor toward photocatalytic CO₂ fixation is largely hampered by the rigid spatial configurations and inadequate orbital overlap between the catalytic site and CO₂. Herein, we propose a second-sphere coordination regulation strategy by atomically tailoring the metal–metal coordination of the secondary building unit (SBU). Amorphous metal-organic framework (a-MOF) is constructed as proof-of-concept to achieve creative control over the second coordination sphere. Such architecture transforms rigid trinuclear nodes into flexible dinuclear motifs. This shift can open spatial proximity to access the guest molecules and optimize s–π* overlap by enabling orbital reorientation. Both in situ experiments and theoretical calculations verify second-sphere engineering endows the Lewis base sites with high electron donating capacity and promotes the electron injection into the π^* anti-bonding orbitals of the CO₂ molecule effectively. Hence, the a-MOF displays approximately double the yield in various photocatalytic CO₂ reactions compared with its crystalline counterpart. Moreover, its photo-assisted Li-CO₂ battery delivers higher discharging voltage and a fourfold increment of discharge capacity at 200 µA cm⁻². The unique ability to tailor the secondary coordination sphere performs attractive merits governing the small molecule binding affinity, aiming to manipulate the local microenvironment of open metal sites for efficient CO₂ fixation. © 2025 Wiley-VCH GmbH.

关键词： Amorphization CO2 Fixation Metal-organic framework Second-sphere coordination regulation

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Development of VME system in RPC electronics for reactor neutrino experiment at Daya Bay Nuclear Power Plant

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Nuclear Science and Techniques 2013年第1期24卷 32-37页

作者： HAO Huifeng LIANG Hao ZHENG Lei DOU Fei XI Jianbo ZHOU Yongzhao State Key Laboratory of Particle Detection & Electronics Anhui Key Laboratory of Physical Electronics Department of Modern Physics University of Science and Technology of China

VME system of the Resistive Plate Chamber (RPC) electronics for the Daya Bay Reactor Neutrino Experiment is described in this paper. A 9U VME RPC trigger module (RTM) is designed to process coincidence signals coming from front end cards (FECs), to generate local triggers and send them to FECs to select the hit data from RPC detector, to report trigger information to a master trigger system and receive cross triggers from the master trigger system. Another 9U VME readout module is designed to collect data from all FECs, to send out configurations to FECs, and to transmit collected hit data to the data acquisition system via VME bus. Test results prove that the VME system is capable of treating a maximum data rate (2.2 MB·s-1 ), without data loss.

关键词： VME总线大亚湾核电站触发系统中微子实验 RPC 反应堆电子触发模块

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Development of portable cosmic-ray muon detector array for muography

arXiv

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arXiv 2025年

作者： Ning, Yunsong Yuan, Yi Yu, Tao Chen, Hongyu Xie, Chengyan Jiang, Hui Liu, Hesheng Lu, Guihao Sun, Mingchen Chen, Yu Tang, Jian School of Physics Sun Yat-sen University Guangzhou510275 China Platform for Muon Science and Technology Sun Yat-sen University Guangzhou China University College London London United Kingdom State Key Laboratory of Particle Detection and Electronics Experimental Physics Department Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

As the multidisciplinary applications of cosmic-ray muons expand to large-scale and wide-area scenarios, the construction of cosmic-ray muon detector arrays has become a key solution to overcome the hardware limitations of individual detector. For muography, the array-based detector design enables fast-scanning of large target objects, allowing for rapid identification of density variation regions, which can improve the efficiency of tomography. This paper integrates scintillator detector technology with Internet of things (IoT) technology, proposing a novel array networking model for nationwide deployment. The model enables long-distance data collection and distribution, laying the foundation for future multidisciplinary applications such as muography and other fields. © 2025, CC BY-NC-ND.

关键词： Cosmic ray detectors

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Pore engineering of ZIF-L fillers to boost the carbon capture performance of Pebax-based mixed matrix membranes

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Journal of Membrane Science 2025年 730卷

作者： Xie, J.M. Xu, W. Chen, Y.W. Guan, J. Liu, J.T. Ye, B.J. Zhang, H.J. State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei230026 China Department of Environmental Science and Engineering University of Science and Technology of China Hefei230026 China

The pore engineering of metal–organic frameworks (MOFs) fillers holds significant potential to enhance the gas separation performance of mixed matrix membranes (MMMs). In this work, we applied the topological phase transformation strategy to the pore engineering of fillers for MMMs. By ultrasonic heating ZIF-L in methanol, the phase transformation was realized in 2 h (much faster than previous works, the product denoted as ZL-2), the morphology of ZIF-L is basically preserved, but its porous structure is thoroughly regulated. This enables us to investigate the pure effect of filler porosity on the microstructure and separation performance of MMMs. As revealed by positron annihilation lifetime spectroscopy, pure Pebax membrane exhibits a unimodel porous structure, but ZL-2@Pebax membrane (ZL-2 fillers of 10 wt%) possesses a bimodal porous structure with a higher porosity. This leads to a remarkable improvement of CO2/N2 separation on both the permeability (45% increment for CO2) and selectivity (11% increment) compared to pure Pebax membrane. These findings address the critical importance of pore engineering of MOF fillers for the gas separation performance of MMMs. © 2025 Elsevier B.V.

关键词： Positron annihilation spectroscopy

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Experimental studies of THGEM in different Ar/CO_2 mixtures

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Chinese Physics C 2014年第5期38卷 58-61页

作者：何占营周健荣孙志嘉杨桂安许虹王艳凤刘倩刘宏邦陈石谢一冈郑阳恒王晓冬张小东胡碧涛陈元柏 School of Nuclear Science and Technology Lanzhou University Institute of High Energy Physics Chinese Academy of Sciences State Key Laboratory of Particle Detection and Electronics University of Chinese Academy of Sciences State Key Laboratory of Particle Detection and ElectronIcs

In this paper, the performance of a type of domestic THGEM （THick Gaseous Electron Multiplier） working in Ar/CO2 mixtures is reported in detail. This kind of single THGEM can provide a gain range from 100 to 1000, which is very suitable for application in neutron detection. In order to study its basic characteristics as a reference for the development of a THGEM based neutron detector, the counting rate plateau, the energy resolution and the gain of the THGEM have been measured in different Ar/CO2 mixtures with a variety of electrical fields. For the Ar/CO2（90%/10%） gas mixture, a wide counting rate plateau is achieved from 720 V to 770 V, with a plateau slope of 2.4%/100 V, and an excellent energy resolution of about 22% is obtained at the 5.9 keV full energy peak of the 55Fe X-ray source.

关键词： THGEM counting rate plateau gas gain energy resolution

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Measurement of the Born cross section for e+e−→ηhc at center-of-mass energies between 4.1 and 4.6 GeV

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Physical Review D 2025年第1期111卷 L011101-L011101页

作者： M. Ablikim M. N. Achasov P. Adlarson O. Afedulidis X. C. Ai R. Aliberti A. Amoroso Q. An Y. Bai Institute of High Energy Physics Beijing 100049 People’s Republic of China Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Also at the Novosibirsk State University Novosibirsk 630090 Russia. Uppsala University Box 516 SE-75120 Uppsala Sweden Bochum Ruhr-University D-44780 Bochum Germany Zhengzhou University Zhengzhou 450001 People’s Republic of China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN University of Turin I-10125 Turin Italy INFN I-10125 Turin Italy University of Science and Technology of China Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China Deceased. Southeast University Nanjing 211100 People’s Republic of China

We measure the Born cross section for the reaction e+e−→ηhc from s=4.129 to 4.600 GeV using datasets collected by the BESIII detector running at the BEPCII collider. A resonant structure in the cross-section line shape near 4.200 GeV is observed with a statistical significance of 7σ. The parameters of this resonance are measured to be M=4188.8±4.7±8.0 MeV/c2 and Γ=49±16±19 MeV, where the first uncertainties are statistical and the second systematic.

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