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Radiation detection Technology and Methods 2021年第4期5卷 600-608页

作者： Tong Zhou Xiaolu Ji Kejun Zhu Fei Li State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsCASBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The Jiangmen Underground Neutrino Observatory(JUNO)is a multi-purpose underground neutrino *** 1800020-inch photomultipliers(PMTs)are instrumented in the Central Detector to detect the photons,and the signals will be captured by high-speed high-resolution waveform full sampling *** addition,about 250003-inch PMTs are also instrumented to capture T/Q Hits *** work builds a DAQ readout prototype system for JUNO,which can be used to test the full readout chain for 20-inch and 3-inch *** The system is designed to continuously readout the data flow from multiple electronics channels,check the raw data,and finally save them into ***,the graphical user interface(GUI)provides a real time display of the sampled *** system is developed with the open source Qt *** The design and performance of the system have been verified in detail,particularly by performance test based on Gigabit Ethernet and 10-Gigabit *** A DAQ readout prototype system has been developed for JUNO,which is successfully applied to electronics testing system in Italy and PMT testing system in Guangdong.

关键词： Data acquisition system DAQ readout prototype JUNO

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Measurement of Heavy Nuclei beyond Iron in Cosmic Rays with the DAMPE experiment 38

Measurement of Heavy Nuclei beyond Iron in Cosmic Rays with ...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Sun, Haoran Zhang, Yongjie Dong, Tiekuang Yu, Yuhong Zhang, Yapeng State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Department of Modern Physics University of Science and Technology of China Hefei230026 China Institute of Modern Physics Chinese Academy of Sciences Nanchang Road 509 Lanzhou730000 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China

Dark Matter particle Explorer (DAMPE) is a calorimetric-type, satellite-borne detector. One important scientific object of DAMPE is to measure the flux of cosmic ray nuclei, which is fundamental for understanding the cosmic ray origin and propagation mechanism. Heavy nuclei beyond Iron in Cosmic Rays play an important role for studying the outstanding issues in the grand cycle of matter in the Galaxy. Thanks to the good charge resolution of the DAMPE PSD detector (∼0.06e for protons, ∼0.3e for iron), the primary charges in a wide range from proton (Z=1) to Zirconium (Z=40) can be identified. In seven years of data-taking from 2016 to 2022, DAMPE has collected data with more than 3 × 106 nuclei with Z≥26. In order to reduce the contamination of Iron in the flux of heavier nuclei in cosmic rays, new charge identification methods have been studied, and the relativistic rise effect has been corrected. Here, such tools and the methods of charge identification aiming to the spectrum measurement will be introduced. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

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Clock and data alignment scheme for readout electronics prototype of PandaX-nT

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Radiation detection Technology and Methods 2021年第2期5卷 161-167页

作者： Shuo Wang Zhongtao Shen Shuwen Wang Changqing Feng Shubin Liu State Key Laboratory of Particle Detection and Electronics(IHEP-USTC) Hefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

Purpose This work proposes a clock and data alignment scheme for the readout electronics system of the future PandaX-nT dark matter detection *** the waveform information of the photomultiplier signal is obtained by accumulating all acquisition channels of the front-end digitization module(FDM),it is required that each FDM acquisition channel should be *** The readout electronics system is composed of a clock distribution module,64 FDMs,and 4 data acquisition(DAQ)*** multi-board synchronous acquisition circuit can provide the same REF CLOCK and SYSREF signal for multiple FDMs boards to ensure the alignment of the sampled data collected by the analog-to-digital *** data aggregation circuit can ensure that the sampled data of multiple FDM boards are aligned with each other when they are aggregated to the DAQ *** and conclusions The functional verification test results show that the synchronization between the prototype electronics channels is less than 80 ps,thus enabling to meet the requirements of the readout electronics prototype of PandaX-nT.

关键词： Dark matter detection PandaX-nT Readout electronics system Synchronization

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Design of a web-based operational software for a CCD test platform 10

Design of a web-based operational software for a CCD test pl...

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X-Ray, Optical, and Infrared Detectors for Astronomy X 2022

作者： Zheng, Zhen-Hao Zhang, Hong-Fei Wang, Zhi-Yue Zhang, Qian Zhu, Ze-Yu Wang, Hui Chen, Cheng Zhu, Lu-Cheng Ge, Kun Liu, Hao Wang, Jian State Key Laboratory of Particle Detection and Electronics Department of Modern Physics University of Science and Technology of China Hefei230026 China Institute of Advanced Technology University of Science and Technology of China Hefei230031 China

ISBN: (纸本)9781510653634

The performance of the camera is a decisive factor in astronomical observations. The scientific CCD fits this need. In order to realize remote control of CCD camera and obtain its performance parameters, a test platform of a scientific CCD camera is built. The test parameters include gain, noise, linearity, full well capacity test, crosstalk test, dark current test. At present, our test platform has carried out multi-group tests of gain, noise, full well and linearity by connecting with a CCD scientific camera. In this paper, a remote control system of the test platform is designed using WEB technology and EPICS, which is convenient for test operators. © 2022 SPIE.

关键词： Remote control

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A Low Noise Readout System for Diamond Microstrip Detectors

A Low Noise Readout System for Diamond Microstrip Detectors

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2021 International Conference on Technology and Instrumentation in particle Physics, TIPP 2021

作者： Luo, Laifu Shen, Zhongtao Yu, Hanlin Zhang, Jianyong Liu, Shubin State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China Department of Modern Physics University of Science and Technology of China Hefei230026 China Beijing100049 China

Diamond is widely adopted in physics experiments owing to its good radiation hardness. In this paper, a low noise electronics system based on charge sensitive amplifier (CSA) is designed to read out diamond microstrip detectors. Up to 40 channels are implemented in the system, each containing a CSA, a CR - RC 2 shaper, an analog to digital convertor (ADC) and a discriminator used for trigger generation. After calibration and joint test with prototype detector with a size of 4×4×0.5 mm 3, a noise level of less than 845 electrons is realized in all 40 channels. Furthermore, the result with 90 Sr radiation source is consistent with the theory, and a position resolution of 13 um is obtained in laser test which indicates the readout system meets the demand of the future experiment. © Published under licence by IOP Publishing Ltd.

关键词： Diamonds

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Design of a Low Power Digital MCA Module for In-situ Environmental Gamma-ray Measurement

Design of a Low Power Digital MCA Module for In-situ Environ...

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2021 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2021

作者： Zhou, Ziheng Feng, Changqing Zhao, Maoyuan Wang, Yichao Cao, Zhe Cao, Ping An, Qi University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics Department of Modern Physics Hefei230026 China

ISBN: (纸本)9781665421133

In-situ gamma-ray detection is an important method for environmental radioactivity measurement. In order to improve the performance and save power consumption, analog shaping electronics are beginning to be replaced by digital signal processing methods. As an essential part of an in-situ gamma-ray spectroscopic system, a digital multi-channel analyzer (MCA) module with 8 independent readout channels is developed and described in this paper. The MCA module is designed with low power consumption (1.0 W in total at 40 MS/s, 0.7 W at 10 MS/s) and small size, which is based on an 8-channel power-efficient ADC and a flash-based FPGA. Signals are digitized and processed individually in each readout channel. Digital filters with adjustable parameters and energy analysis are realized in the flash-based FPGA. Combined with a quasi-hemispherical structure CdZnTe (CZT) detector and accompanying front-end analog electronics, the function of digital signal processing has been verified, and the performance of the digital MCA has been tested. Results show that the energy resolution is 1.84% (FWHM) at 662keV, which is close to the intrinsic resolution of the tested quasi-hemispherical CZT detector. © 2021 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Method of Separating Cosmic-Ray Positrons from Electrons in the DAMPE Experiment

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Research in Astronomy and Astrophysics 2022年第3期22卷 115-121页

作者： Hao-Ting Dai Jing-Jing Zang Ying Wang Chuan-Ning Luo Yun-Long Zhang Zhi-Yong Zhang Yi-Feng Wei Li-Bo Wu Cheng-Ming Liu Cong Zhao Xiao-Lian Wang Zi-Zong Xu Guang-Shun Huang 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 Physics and Electronic Engineering Linyi UniversityLinyi 276000China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Gran Sasso Science Institute (GSSI)

A method of identifying positron/electron species from the cosmic rays was studied in the DArk Matter particle Explorer(DAMPE)*** there is no onboard magnet on the satellite,the different features imposed by the geomagnetic field on these two species were exploited for the particle *** of this method to the simulation of on-orbit electrons/positrons/protons and the real flight data proves that separately measuring the CR positrons/electrons with DAMPE is feasible,though limited by the field of view for the present observation *** analysis on the positron flux with this method can be expected in the future.

关键词： (ISM:)cosmic rays magnetic fields (cosmology:)dark matter

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Low Noise Front-end electronics for a CZT-based Gamma-ray Spectrometer

Low Noise Front-end Electronics for a CZT-based Gamma-ray Sp...

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2021 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2021

作者： Zhao, Maoyuan Feng, Changqing Zhou, Ziheng Wang, Yichao Cao, Zhe Cao, Ping An, Qi University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics Department of Modern Physics Hefei230026 China

ISBN: (纸本)9781665421133

A low noise, low power consumption front-end electronics module, for the readout of cadmium zinc tellurium (CZT) detector, is presented in this paper. It is used for a high resolution gamma ray spectrometer aiming for in-situ environmental gamma ray measurements. The module consists of charge-sensitive amplifier (CSA), differential ADC driver, high voltage module and calibration module. Test results show that the rise time is about 31 ns. The noise with zero capacitance is 329e- (0.053fC) and increases with a slope of 2.9 e- / pF in the range of less than 200 pF input capacitance, consistent with the simulation results. The input range of negative charge is up to 40 fC. The power consumption is about 80 mW per channel. It is relatively fast response, low noise, and low power consumption for the front-end electronics module with discrete components. A quasi-hemispherical CZT detector with the sensitive volume of 10 mm × 10 mm × 5 mm and the electronics module were used to obtain the spectrum of 137Cs as the radioactive source. An energy resolution of 1.8% at 662 keV FWHM at the room temperature is obtained, without any discrimination methods, which is satisfied for our application. © 2021 IEEE.

关键词： Capacitance

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A Gather Accelerator for GNNs on FPGA Platform 27

A Gather Accelerator for GNNs on FPGA Platform

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27th IEEE International Conference on Parallel and Distributed Systems, ICPADS 2021

作者： Yuan, Wei Tian, Teng Liang, Huawen Jin, Xi Institute of Microelectronics University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics Department of Physics Hefei China

ISBN: (纸本)9781665408783

Graph Neural Networks (GNNs) have emerged as the state-of-the-art deep learning model for representation learning on graphs. GNNs mainly include two phases with different execution patterns. The Gather phase, depends on the structure of the graph, presenting a sparse and irregular execution pattern. The Apply phase, acts like other neural networks, showing a dense and regular execution pattern. It is challenging to accelerate GNNs, due to irregular data communication to gather information within the graph. To address this challenge, hardware acceleration for Gather phase is critical. The purpose of this research is to design and implement an FPGA-based accelerator for Gather phase. It achieves excellent performance on acceleration and energy efficiency. Evaluation is performed using a Xilinx VCU128 FPGA with three commonly-used datasets. Compared to the state-of-the-art software framework running on Intel Xeon CPU and NVIDIA P100 GPU, our work achieves on average 101.28× speedup with 75.27× dynamic energy reduction and average 12.27× speedup with 45.56× dynamic energy reduction, respectively. © 2021 IEEE.

关键词： Graph neural networks

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Mechanical design of an ultra-light vertex detector prototype for CEPC

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Radiation detection Technology and Methods 2022年第2期6卷 159-169页

作者： Jinyu Fu Zhijun Liang Hao Zeng Gang Li Mingyi Dong Huamin Qu Joao Guimaraes da Costa Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics.Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Background The Circular Electron Positron Collider(CEPC)is a large international scientific facility proposed to study the Higgs boson in great *** requires state-of-the-art detectors,including extremely precise vertexing and tracking devices,such as a silicon vertex *** Silicon vertex detector with the precision required by the CEPC has never been built before and needs extensive research and *** paper describes the mechanical design of a vertex detector prototype being built to explore the required technologies and the major *** The exceptional high spatial resolution of the CEPC vertex detector is achievable only with a detector of extremely low mass to limit particle *** paper proposes a mechanical design for the vertex detector prototype,highlighting the choice of low-mass materials,the analysis of support structures,the solution of detector cooling issues,and the drafts of procedures for detector *** The ultra-light support of the ladder(a structural unit of the CEPC vertex detector prototype),which is mainly made of carbon fiber reinforced polymer composite,has been *** fabrication process has also been *** supporting and cooling method of the vertex detector prototype has been designed and chosen with results from finite element analysis and computational fluid dynamics *** assembly and installation schemes for the prototype have been developed,and the respective tooling has also been *** performance of the vertex detector prototype,using this low-mass mechanical structure,was demonstrated with fast simulation to closely meet the CEPC physics requirement.

关键词： CEPC Silicon detector Mechanical design Carbon fiber reinforced polymer

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