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Building of a ton-scale liquid argon prototype detector

Radiation detection Technology and Methods 2024年第2期8卷 1120-1130页

作者： Kangkang Zhao Mengyun Guan Qin Zhao Zhongtao Shen Peng Zhang Jinchang Liu Changgen Yang Lei Wang Zeyuan Yu Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei230026China College of Physics Sichuan UniversityChengdu610065China

Background Based on the unique PSD characteristic which essentially relies on the detector light yield,liquid argon detector is widely used for dark matter searching *** experimental study of how to get larger light yield for a ton-scale liquid argon detector is worth to be carried *** A ton-scale liquid argon prototype detector is built to check the detector implementation as well as the light collection *** A ton-scale single-phase liquid argon prototype detector is built in the surface laboratory for scalable detector construction *** detector adopts the classical spherical arrangement mode to obtain a large PMT photocathode ***-two PMTs are immersed in the liquid argon,and polymer materials are used to construct the PMT supporting *** about 2.2 tons of liquid argon is used,of which about 160 kg is the active *** this paper the details of the experiment as well as the detector performance are *** Experiment results show that the light yield reaches 6.3 PE/keV,with an effective photon collection efficiency of 74.3%achieved.

关键词： Liquid argon detector Purity Light yield PMT

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Exploring the photoproduction of ρ and in hadronic heavy-ion collisions

arXiv

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arXiv 2024年

作者： Shen, Kaifeng Wu, Xin Tang, Zebo Zha, Wangmei State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China

Significant enhancements of J/ψ production have been observed by various experiments at RHIC and LHC for very low transverse momenta in peripheral heavy-ion collisions, which has ignited a surge of investigations into photon-induced processes in hadronic heavy-ion collisions (HHICs). Within this wave of research enthusiasm, the search for more photon induced products in HHICs becomes paramount. In this paper, we perform the calculation of the ρ and production resulting from photon-nucleus interactions in HHICs, which are crucial probes for studying the properties of Quark-Gluon Plasma (QGP) in HHICs. Our study reveals that, in comparison to hadronic production, the photon-induced production of ρ and does not reach the same level of significance as that observed in J/ψ production. Nevertheless, it remains substantial, especially in peripheral collisions, holding great promise for experimental verification in the imminent future. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

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Grain boundary engineering for enhancing intergranular damage resistance of ferritic/martensitic steel P92

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Nuclear Science and Techniques 2024年第5期35卷 186-199页

作者： Lei Peng Shang-Ming Chen Jing-Yi Shi Yong-Jie Sun Yi-Fei Liu Yin-Zhong Shen Hong-Ya He Hui-Juan Wang Jie Tian State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China School of Materials Engineering Shanghai University of Engineering Science333 Long Teng RoadShanghai 201620China Experimental Center of Engineering and Material Science University of Science and Technology of ChinaHefei 230026China

Ferritic/martensitic(F/M)steel is widely used as a structural material in thermal and nuclear power ***,it is susceptible to intergranular damage,which is a critical issue,under service *** this study,to improve the resistance to intergranular damage of F/M steel,a thermomechanical process(TMP)was employed to achieve a grain boundary engineering(GBE)microstructure in F/M steel *** TMP,including cold-rolling thickness reduction of 6%,9%,and 12%,followed by austenitization at 1323 K for 40 min and tempering at 1053 K for 45 min,was applied to the as-received(AR)P92 *** prior austenite grain(PAG)size,prior austenite grain boundary character distribution(GBCD),and connectivity of prior austenite grain boundaries(PAGBs)were *** to the AR specimen,the PAG size did not change *** fraction of coincident site lattice boundaries(CSLBs,3≤Σ≤29)and Σ3^(n) boundaries along PAGBs decreased with increasing reduction ratio because the recrystallization fraction increased with increasing reduction *** PAGB connectivity of the 6%deformed specimen slightly deteriorated compared with that of the AR ***,potentiodynamic polarization studies revealed that the intergranular damage resistance of the studied steel could be improved by increasing the fraction of CSLBs along the PAGBs,indicating that the TMP,which involves low deformation,could enhance the intergranular damage resistance.

关键词： Grain boundary engineering Ferritic/martensitic steel Prior austenite grain boundary character distribution Grain boundary connectivity Intergranular damage resistance

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Study on schottky barrier of Cu/Graphene/4H-SiC interface based on first principles 4

Study on schottky barrier of Cu/Graphene/4H-SiC interface ba...

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2023 4th International Conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2023

作者： Wang, Congcong Wu, Siyu Jiang, Zhenyu Huang, Yingjie Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Particle Detection and Electronics Beijing100049 China Jilin University Changchun130012 China Liaoning University Shenyang110036 China

High stability 4H-SiC ohmic contact is currently a key technical challenge that silicon carbide devices urgently need to overcome. In the paper, the interfacial structures, atomic interactions and Schottky barrier height (SBH) of Cu/Graphene/4H-SiC were studied using the first-principles method. According to research, the SBH for Cu/G/4H-SiC is lower than the SBH for Cu/4H-SiC. The reasons for this phenomenon mainly include the following: 1. The graphene C atoms saturate the dangling bonds on the 4H-SiC surface and the influence of the metal-induced-gap-states (MIGS) at the interface is decreased. 2. A new phase is formed by inserting graphene between the Cu and 4H-SiC have low work functions. 3. An interfacial-electric-dipole layer (IEDL) formed at the interface of 4H-SiC and graphene may also reduce the SBH. These results make them to be promising candidates for future radiation resistant electronics. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Silicon carbide

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The studies about BGO calorimeter of Very Large Area gamma ray Space Telescope 38

The studies about BGO calorimeter of Very Large Area gamma r...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Zhang, Yanshuo Wang, Ying Chen, Qian Hu, Yiming Chen, Dengyi State Key Laboratory of Particle Detection and Electronics USTC Hefei China No.96 Jinzhai Road Baohe District Hefei China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory CAS China No.8 Yuanhua Road Qixia District Nanjing China

Cosmic rays are one of the important sources of high-energy particles, but at present our understanding of its origin, transmission and interaction process is still very limited. In addition, the exploration of dark matter is also one of the most popular issues in international research. Very Large Area gamma ray Space Telescope (VLAST) is the next generation of flagship space observatory, which has a large acceptance, extremely high angular resolution and energy resolution. It has three sub-detectors, which are anti-coincidence detector, silicon tracker and low energy gamma-ray detector and high energy imaging calorimeter, and the last one composed of BGO crystals is the key subdetector. It has 8 layers with 192 crystals per layer, and the size of every crystal is 2.5 cm × 2.5 cm × 120 cm. In order to study the performance of the BGO calorimeter, we carry out the simulation based on GEANT4 software to study energy linearity, resolution, and particle identification ability. In addition, the performance of meter-size BGO crystal produced by Shanghai Institute of Ceramics was tested, the light yield and attenuation length were studied, and the large dynamic range readout scheme with two Avalanche photodiodes (APDs) was also studied. Here, the simulation and experimental test results will be introduced. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Calorimeters

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Centrality Manipulation in Exclusive Photoproduction at the Electron-Ion Collider

arXiv

引用

arXiv 2024年

作者： Wu, Xin Li, Xinbai Tang, Zebo Wang, Kaiyang Zha, Wangmei State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China

In the context of future electron-ion collision experiments, particularly the Electron-Ion Collider (EIC) and the Electron-Ion Collider in China (EicC), investigating exclusive photoproduction processes is of paramount importance. These processes offer a unique opportunity to probe the gluon structure of nuclei across a broad range of Bjorken-x, facilitating measurements of nuclear shadowing and searches for gluon saturation and/or the color glass condensate. This paper explores the potential of utilizing neutron tagging from Coulomb excitation of nuclei to effectively determine centrality for exclusive photoproduction in electron-ion collisions. By developing the equivalent photon approximation for fast-moving electrons, this work incorporates a coordinate-space-dependent photon flux distribution, elucidating the relationship between the photon transverse momentum distribution and collision impact parameter. Leveraging spatial information from the photon flux, the differential cross section for Coulomb excitation of nuclei is derived. Our calculations demonstrate that neutron tagging can significantly alter impact parameter distributions, thereby providing a robust method for centrality manipulation in electron-ion collisions. This study contributes essential baseline and strategies for exploring the impact parameter dependence of exclusive photoproduction, offering novel insights for experimental design and data analysis. Ultimately, it provides additional information to better visualize the gluon distribution within the nucleus. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

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Prototype of the readout electronics for the RICH PID detector in the STCF

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Nuclear Science and Techniques 2022年第6期33卷 148-160页

作者： Bao-Lin Hou Lei Zhao Jia-Jun Qin Ye-Qun Qi Jia-Ming Li Zi-Yu Yang Shu-Bin Liu Qi An State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

The ring imaging Cherenkov(RICH) detector for particle identification(PID) is being evaluated for the future super tau-charm facility(STCF) complex. In this work, the prototype readout electronics for the RICH PID detector is designed. The prototype RICH PID detector is based on a thick gas electron multiplier combined with a micromegas detector for Cherenkov light detection. Considering that there will be a large number(~ 690,000) of detector channels in future RICH detector, the readout electronics faces many challenges to precisely measuring time and charge information, such as reducing the noise,increasing density, and improving precision. The requirements of the readout electronics are explored, the downselection of the ASICs is made and thus a prototype readout electronics is designed and implemented. Tests are also conducted to evaluate the performance of the prototype readout electronics, and the results indicate that the time resolution is better than ~ 1 ns(RMS) when the input charge is greater than ~ 12 fC based on the APV25chip, while the time resolution is better than ~ 1 ns(RMS) at an input charge of over ~ 48 fC based on the AGET and STCF ASIC chips, and the equivalent noise charge is better than ~ 0.5 fC(RMS) @ 20 pF based on the three ASICs. The test results indicate that the prototype readout electronics design meets the requirement of the future RICH PID detector and thus provides a reference for future engineering.

关键词： Readout electronics Time measurement Charge measurement RICH PID detector STCF

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Insights into the dual-roles of alloying elements in the growth of Sn whiskers

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Journal of Materials Science & Technology 2022年第22期117卷 65-71页

作者： Yan Zhang Chengjie Lu Yun Dong Min Zhou Jiandang Liu Hongjun Zhang Bangjiao Ye ZhengMing Sun School of Materials Science and Engineering Southeast UniversityNanjing 211189China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China

The growth of Sn whiskers from Ti_(2)SnC/Sn-X(X=Sn,Bi,Pb,Ga)samples was studied in this work to understand the effect of alloying elements on whiskering *** mobility of source Sn atoms relating with the formation and migration of defects was found to be the critical factor dominating the growth rate,with the gathering of which to grow whiskers on the surface acts as an effective means to lower the *** a result,the source Sn atoms would migrate to whisker root spontaneously,making the growth of whiskers the nature of materials,and external factors like compressive stress or oxidation are no more necessary but facilitate the whiskering process by promoting the mobility of source Sn atoms.

关键词： Whisker MAX phase DFT Positron annihilation Defects

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Study on Front-End Board for Radioactive Gas Dose Monitor Based on PIPS Detector 6

Study on Front-End Board for Radioactive Gas Dose Monitor Ba...

引用

6th International Conference on electronics Technology, ICET 2023

作者： Ma, Shengjie Chen, Lian Xu, Xiaoyu Jin, Ge University of Science and Technology of China Hefei China University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics Hefei China University of Science and Technology of China Hefei National Laboratory Hefei China

ISBN: (纸本)9798350337693

In this paper, a design of front-end board (FEB) is reported. This FEB can be used in gas dose monitor based on passivated implanted planar silicon (PIPS) detector to collect and process signals received by PIPS detector. The FEB consists of two symmetrical circuits, each of which can process and collect signals from the PIPS detector. The symmetrical structure is designed for coincidence measurement to help eliminate the effects of interfering radiation in radioactive gas dose monitor. The experimental results show that the time signal output by the circuit has a rise time of about 0.4 us, and the amplitude signal waveform is close to a Gaussian shape. PIPS detectors with different sensitive areas and pole-zero phase elimination circuit are used to enhance the performance of the FEB at high count rates. The entire FEB adopts a low power design, with a power consumption of only 0. 1W during operation. The theoretical basis of circuit design is discussed and the circuit implementation is given. Based on the results of practical experiments, the basic principles of selecting parameters in the FEB are given. © 2023 IEEE.

关键词： Timing circuits

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Design of observatory control system of WFST 10

Design of observatory control system of WFST

引用

Observatory Operations: Strategies, Processes, and Systems X 2024

作者： Zhu, Ze-Yu Cao, Zhi-Hao Sun, Yu-Chen Zhang, Yu Xu, Ruo-Jin Li, Feng Zhu, Qing-Feng Wang, Jian State Key Laboratory of Particle Detection and Electronics Department of Modern Physics University of Science and Technology of China Hefei230026 China Deep Space Exploration Laboratory Hefei230088 China Institution of Advanced Technologies University of Science and Technology of China Hefei230061 China

ISBN: (纸本)9781510675193

WFST telescope is a large-aperture sky survey telescope jointly built by the University of Science and Technology of China and Purple Mountain Observatory. It is currently the most powerful optical time-domain sky survey telescope in the northern hemisphere. Its scientific goals are diverse, and the urgency and observation window period of different scientific tasks are different. During the observation period, the control of equipment requires accuracy, real-time, efficiency and safety. Therefore, we design and implement the OCS (Observatory Control System) of WFST which performs multi-layer abstraction on each hardware device and puts more attention on the operation of the observation process and the scheduling of observation tasks. In order to ensure the safety of equipment during the observation process, the OCS introduces a weather alarm system and fault diagnosis system. At the same time, we design an observation strategy system in the OCS to adjust the observation plan based on task priority, equipment information and meteorological information to maximize the efficiency of sky survey. © 2024 SPIE.

关键词： Alarm systems

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