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A new TOF system for target recoil-ion momentum spectroscopy at IMP

Nuclear Science and Techniques 2011年第6期22卷 372-378页

作者： ZHOU Jiawen LIU Shubin YIN Chunyan AN Qi ZHAO Lei State Key Laboratory of Particle Detection ＆ Electronics Hefei 230026 China Anhui Key Laboratory of Physical Electronics Department of Modern Physics University of Science and technology of China Hefei 230026 China

A high resolution time measurement system with high data transfer rate was designed for the COLTRIMS (Cold Target Recoil-Ion Momentum Spectroscopy) system in Institute of Modern Physics,Chinese Academy of *** is used to measure the Time of Flight(TOF) with a high resolution for all 20 *** on the PCI Extensions for Instrumentation(PXI) standard,the readout electronics system consists of one Clock-Trigger fan-out module and four TOF *** results show that the system meets the demands of COLTRIMS,with a time resolution of better than 25 ps and a data transfer rate over 20 MB/s.

关键词：反冲离子 F系统动量谱进出口近代物理研究所中国科学院飞行时间数据传输速率

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Dedicated 4πβ(LS)-γ(HPGe) digital coincidence system based on synchronous high-speed multichannel data acquisition

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Chinese Physics C 2016年第3期40卷 109-114页

作者：陈吉锋宋克柱柳加成 State Key Laboratory of Particle Detection and Electronics USTC Hefei 230026 China Ministry of Environmental Protection of Nuclear and Radiation Safety Center Beijing 100082 China

A dedicated 4πβ（LS）-γ（HPGe） digital coincidence system with five acquisition channels has been developed. Three ADC acquisition channels with an acquisition resolution of 8 bits and acquisition rate of 1 GSPS are utilized to collect the signals from three PMTs which are used to detect β decay, and two acquisition channels with an acquisition resolution of 16 bits and acquisition rate of 50 MSPS are utilized to collect the signals from high-purity germanium（HPGe）, which is used to detect γ decay. In order to increase the accuracy of the coincidence system, all five acquisition channels are synchronous within 500 ps. The data collected by the five acquisition channels will be transmitted to the host PC through a PCI bus and saved as a file. Off-line software is utilized for the 4πβ（LS）-γ（HPGe） coincidence and data analysis as needed in practical applications. Tests of the system show that system can record pulse signals from 4πβ（LS）-γ（HPGe） synchronously for further coincidence calculation and the highest coincidence rate of the system is 20 K/s, which is sufficient for most applications. Compared with traditional coincidence modules like MAC3, the digital coincidence system has a higher flexibility of coincidence algorithm. In addition, due to the use of ADC, the structure of the coincidence system is simplified. This paper introduces the design of the hardware, the synchronization method and the test results of this system.

关键词： liquid scintillation 4πβ(LS) –γ(HPGe) coincidence system high-speed ADC

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A new method of waveform digitization based on time-interleaved A/D conversion

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Chinese Physics C 2013年第11期37卷 49-57页

作者：叶春逢赵雷封常青刘树彬安琪 State Key Laboratory of Particle Detection & Electronics University of Science and Technology of China Anhui Key Laboratory of Physical Electronics Department of Modern PhysicsUniversity of Science and Technology of China 705 Research Division of Electronic Engineering Institute

Time interleaved analog-to-digital conversion （TIADC） based on parallelism is an effective way to meet the requirement of the ultra-fast waveform digitizer beyond Gsps. Different methods to correct the mismatch errors among different analog-to-digital conversion channels have been developed previously. To overcome the speed limi- tation in hardware design and to implement the mismatch correction algorithm in real time, this paper proposes a fully parallel correction algorithm. A 12-bit l-Gsps waveform digitizer with ENOB around 10.5 bit from 5 MHz to 200 MHz is implemented based on the real-time correction algorithm.

关键词： waveform digitizer time-interleaved analog-to-digital conversion time-skew error digital correctionalgorithms

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Non-extensive statistical distributions of charmed meson production in Pb-Pb and pp(p)collisions

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Nuclear Science and Techniques 2021年第10期32卷 79-87页

作者： Yuan Su Yong-Jie Sun Yi-Fei Zhang Xiao-Long Chen 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

The mid-rapidity transverse momentum spectra of charmed mesons in Pb–Pb and pp(p)collisions are analyzed using the Tsallis–Pareto distribution derived from non-extensive *** provide uniform descriptions of both small and large systems over a wide range of collision energies and hadron transverse *** establishing the relationship between the event multiplicity and Tsallis parameters,we observe that there is a signifi-cant linear relationship between the thermal temperature and Tsallis q parameter in Pb–Pb collisions at √sNN=2.76 TeV and 5.02 ***,the slope of the T–(q-1)parameter plot is positively correlated with the hadron *** addition,charmed mesons have a higher thermal temperature than light hadrons at the same q-1,indicat-ing that the charm flavor requires a higher temperature to reach the same degree of non-extensivity as light flavors in heavy-ion *** same fit is applied to the trans-verse momentum spectra of charmed mesons in pp(p)collisions over a large energy range using the Tsallis–Pareto *** is found that the thermal temperature increases with system energy,whereas the q parameter becomes saturated at the pp(p)limit,q-1=0.142±*** addition,the results of most peripheral Pb–Pb collisions are found to approach the pp(p)limit,which suggests that more peripheral heavy-ion collisions are less affected by the medium and more similar to pp(p)collisions.

关键词： Charmed meson Non-extensive statistics Tsallis-Pareto distribution QGP Heavy-ion collision

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A digitalizing board for the prototype array of LHAASO WCDA

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Nuclear Science and Techniques 2011年第3期22卷 178-184页

作者： HAO Xinjun LIU Shubin ZHAO Lei AN Qi State Key Laboratory of Particle Detection & Electronics Hefei 230026 China anhui Key Laboratory of Physical Electronics Department of Modern Physics University of Science and technology of China HeJbi 230026 China

In this paper,a digitalizing board for readout of PMT signals in the prototype array of WCDA(water Cerenkov detector array)for LHAASO(Large high altitude air shower observatory)is *** prototype array is composed of 9 PMTs,including the pulse time and charge measurement from the PMTs,and clock generation and trigger *** the digitalizing board,FPGA reconfiguration and data readout via VME bus are *** results show that the performances meet well with the requirements of readout *** has been installed in Yangbajing and tests with the prototype array and DAQ is ongoing.

关键词：探测器阵列数字化板原型光电倍增管数据读出 VME总线时钟产生电荷测量

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FPGA-based α/γ pulse shape discrimination for BaF_2 detector using 2-GSPS fast waveform sampling

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Nuclear Science and Techniques 2017年第2期28卷 24-29页

作者： Chen-Fei Yang Chang-Qing Feng Shu-Bin Liu Qi An State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Four FPGA-based α/γ pulse shape discrimination algorithms for Ba F2 detector are investigated and compared in this paper. A 2-GSPS fast waveform sampling board based on DRS4 chip is employed to sample the pulses. The test results with a22 Na γ-source and the natural radioactivity of Ba F2 show good discrimination performance of the algorithms, with false rates around 1%. Small logical resource occupancy and short dead time are achieved. About 4400 slices are used in FPGA for pulse sampling and real-time discrimination altogether.

关键词： BaF2 Pulse extraction a/c Discrimination DRS4 FPGA

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Readout system for ground-based tests of BGO calorimeter of DAMPE satellite

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Nuclear Science and Techniques 2017年第10期28卷 45-50页

作者： Jun-Bin Zhang Chang-Qing Feng Si-Yuan Ma Qi Wang 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 andTechnology of ChinaHefei 230026China

A readout system for ground-based tests of the bismuth germanium oxide(BGO) calorimeter of the Dark Matter particle Explorer satellite is described in this *** system mainly consists of a data acquisition board with a field-programmable gate array to implement the control logic, and a graphical user interface software based on LabWindows/CVI. The system has been successfully applied in a series of ground-based environmental experiments and almost all the performance tests throughout the entire manufacturing processes. These contribute significantly to the development of the BGO calorimeter before being submitted for satellite-level integration.

关键词：卫星地面测试读出系统 BGO LabWindows/CVI 现场可编程门阵列阻尼图形用户界面暗物质粒子

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laboratory measurement of radioactivity purification for ^(212)Pb in liquid scintillator

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Chinese Physics C 2016年第9期40卷 120-124页

作者：胡维方建俞伯祥张烜周莉蔡啸孙丽君刘万金王岚吕军光 State Key Laboratory of Particle Detection and Electronics (Institute of High Energy Physics CAS) Institute of High Energy Physics University of Chinese Academy of Sciences

Liquid scintillator（LS） has been widely used in past and running neutrino experiments, and is expected also to be used in future experiments. Requirements on LS radio-purity have become higher and higher. Water extraction is a powerful method to remove soluble radioactive nuclei, and a mini-extraction station has been constructed. To evaluate the extraction efficiency and optimize the operation parameters, a setup to load radioactivity to LS and a laboratory scale setup to measure radioactivity using the ^212Bi-^212Po-^208Pb cascade decay have been developed. Experience from this laboratory study will be useful for the design of large scale water extraction plants and the optimization of working conditions in the future.

关键词： liquid scintillator radioactive load radioactive measurement cascade decay water extraction

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Design of online control and monitoring software for the CPPF system in the CMS Level-1 trigger upgrade

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Nuclear Science and Techniques 2018年第11期29卷 279-286页

作者： Li-Bo Cheng Peng-Cheng Cao Jing-Zhou Zhao Zhen-An Liu School of Physical Sciences University of Chinese Academy of Sciences State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of Sciences

The concentration preprocessing and fan-out(CPPF) system is one of the electronic subsystems of the upgraded Compact Muon Solenoid(CMS) Level-1 trigger system. It includes, in hardware, eight specially designed CPPF cards, one CMS card called AMC13, one commercial Micro-TCA Carrier HUB(MCH) card, and a MicroTCA shelf. Powerful online software is needed for the system, including providing reliable configuration and monitoring for the hardware, and a graphical interface for executing all actions and publishing monitoring ***, to control and monitor the large amount of homogeneous hardware, the SoftWare Automating conTrol of Common Hardware(SWATCH) concept was proposed and developed. The SWATCH provides a generic structure and is flexible for customization. The structure includes a hardware access library based on the IPbus protocol, which assumes a virtual 32-bit address/32-bit data bus and builds a simple hardware access layer. Furthermore, the structure provides a graphical user interface, which is based on modern web technology and is accessible by web page. The CPPF controlling and monitoring online software was also customized from a common SWATCH cell, and provides afinite state machine(FSM) for configuring the entire CPPF hardware, and five monitoring objects for periodically collecting monitoring data from five main functional modules in the CPPF hardware. This paper introduces the details of the CPPF SWATCH cell development.

关键词： CPPF CMS Level-1 trigger SWATCH Monitor IPbus

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A reconfigurable virtual nuclear pulse generator via the inversion method

A reconfigurable virtual nuclear pulse generator via the inv...

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International Conference on Technology and Instrumentation in particle Physics, TIPP 2017

作者： Yin, Weigang Chen, Lian Li, Feng Wang, Baochen He, Zhou Jin, Ge State Key Laboratory of Particle Detection and Electronics USTC Hefei230026 China

ISBN: (纸本)9789811313127

In this paper, we present a design of reconfigurable virtual nuclear pulse generator which can simulate the nuclear pulse signals. First, the inversion method is used to generate random numbers (amplitudes of pulses and time intervals between adjacent pulses) which indicate the statistical characteristics of the real nuclear pulses in amplitude and time. Then, the digital pulses are synthesized in FPGA using these amplitudes and time intervals. Finally, a DAC is used to output the emulated nuclear signal. Through this design, the emulated signal can be the same as the real nuclear pulses to obey a specific energy distribution in amplitude and subject to the Poisson distribution in time. Compared with commercial periodic signal generators, it can better test the performances of the nuclear spectrometers especially the throughput, pile-up rejection and baseline recovery capability. Experimental results show that the generator behaves like the real radiation source and the detector very well, and it has a count rate beyond 2 M/s. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Poisson distribution

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