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Simulation of a soft-gamma-ray polarimeter on board a microsatellite

Nuclear Science and Techniques 2023年第11期34卷 64-76页

作者： Xiang‑Man Liu shu‑wen tang Wei Wang Yu‑Hong Yu Zhi‑Yu Sun Yong‑Jie Zhang Fang Fang Duo Yan Shi‑Tao Wang Xue‑Heng Zhang shu‑Ya Jin Bi‑Tao Hu Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Department of Astronomy School of Physics and TechnologyWuhan UniversityWuhan 430072China Wuhan University‑National Astronomical Observatories Joint Center for Astronomy Wuhan UniversityWuhan 430072China

Gamma-ray polarimetry is a new and prospective tool for studying extremely high-energy celestial objects and is of great significance for the field of *** the rapid development of microsatellite technology,the advantages of space exploration have become increasingly ***,we simulated a soft-gamma-ray polarimeter for a microsatellite based on the Compton scattering *** performed detailed Monte Carlo simulations using monoenergetic gamma-ray linear-polarization sources and Crab-like sources in the energy range of 0.1-10 MeV considering the orbital *** polarimeter exhibited excellent polarization detection *** modulation factor was 0.80±0.01,and the polarization angles were accurate within an error of 0.2°at 200 keV for on-axis *** the Crab-like sources for on-axis incidence,the polarization degrees were consistent with the set values within the error tolerance,the modulation factor was 0.76±0.01,and the minimum detectable polarization reached 2.4%at 3σfor an observation time of10^(6) ***,the polarimeter exhibited recoil electron tracking,imaging,and powerful background suppression in a large field of view(FoV;∼2πsr).The proposed polarimeter meets the requirements of a space soft-gamma-ray polarization detector and has promising research prospects.

关键词： Soft gamma ray Polarization Compton scattering Microsatellite Monte Carlo simulation

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Design and prototyping of the readout electronics for the transition radiation detector in the high energy cosmic radiation detection facility

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Nuclear Science and Techniques 2024年第4期35卷 189-199页

作者： Jie-Yu Zhu Yang-Zhou Su Hai-Bo Yang Fen-Hua Lu Yan Yang Xi-wen Liu Ping Wei shu-Cai Wan Hao-Qing Xie Xian-Qin Li Cong Dai Hui-Jun Hu Hong-Bang Liu shu-wen tang Cheng-Xin Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

The high energy cosmic-radiation detection(HERD)facility is planned to launch in 2027 and scheduled to be installed on the China Space *** serves as a dark matter particle detector,a cosmic ray instrument,and an observatory for high-energy gamma rays.A transition radiation detector placed on one of its lateral sides serves dual purpose,(ⅰ)calibrating HERD's electromagnetic calorimeter in the TeV energy range,and(ⅱ)serving as an independent detector for high-energy gamma *** this paper,the prototype readout electronics design of the transition radiation detector is demonstrated,which aims to accurately measure the charge of the anodes using the SAMPA application specific integrated circuit *** electronic performance of the prototype system is evaluated in terms of noise,linearity,and *** the presented design,each electronic channel can achieve a dynamic range of 0–100 fC,the RMS noise level not exceeding 0.15 fC,and the integral nonlinearity was<0.2%.To further verify the readout electronic performance,a joint test with the detector was carried out,and the results show that the prototype system can satisfy the requirements of the detector's scientific goals.

关键词： HERD Dark matter particle detection TRD Readout electronics SAMPA Data acquisition Performance test

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Simulation of stray grain formation at the platform during Ni-base single crystal superalloy DD403 casting

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China Foundry 2015年第2期12卷 118-122页

作者： Si-feng Gao Lin Liu Jun Zhang Jun-feng Xiao wen-shu tang Yong-jun Li Qing Nan Xi’an Thermal Power Research Institute Co. Ltd. State Key Laboratory of Solidifi cation Processing Northwestern Polytechnical University

The mechanism of stray grain formation at the platform of turbine blade simulator and the effect of withdrawal rate （V） on the stray grain phenomenon have been investigated using a macro-scale ProCAST coupled with a 3D Cel ular Automaton Finite Element （CAFE） model. The results indicate that the stray grains nucleate at the edges of platform at V=150μm·s-1 and 200μm·s-1. Using ProCAST computer simulation software, it was proven that the stray grain formation is signiifcantly dependent on the undercooling and the temperature ifeld distribution in the platform. The macroscopic curvature of the liquidus isotherm becomes markedly concave with an increase in the withdrawal rate. The probability of stray grain formation at the edges of platform can be increased by increasing the withdrawal rate in the range of 70μm·s-1 to 200μm·s-1.

关键词： nickel-based single crystal superalloy directional solidification stray grains undercooling

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Design and evaluation of prototype readout electronics for nuclide detector in Very Large Area Space Telescope

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Nuclear Science and Techniques 2022年第5期33卷 154-166页

作者： Hai-Bo Yang Xian-Qin Li Yu-Hong Yu Yong Chen Jie Kong Yong-Jie Zhang shu-wen tang Jian-Hua Guo Bing Yang Feng-Jiao Su wen-Jian Sun Jin-Xiang Wang Cheng-Xin Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Harbin Institute of Technology Harbin 150001China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210000China Harbin University of Science and Technology Harbin 150080China Northwest Normal University Harbin 150080China

China plans to develop the next generation dark matter particle explorer satellite,referred to as the Very Large Area Space Telescope(VLAST).As an essential step in this process,the prototype design of detectors and electronics for the VLAST is currently *** nuclide detector is a core detector in the *** mainly measures nuclides’charges and distinguishes high-energy gamma rays and *** paper will discuss the prototype readout electronics for the VLAST’s nuclide detector,which accurately measures the charge signal of the photomultiplier tubes using the VATA160 applicationspecific integrated circuit chip;furthermore,we consider a series of critical problems,including radiation-hardening and environment *** test results show that the system exhibits stable operation,good performance,and good technical ***,each electronic channel achieves a dynamic range of 0-12.5 pC,the random noise level exceeds 1.6 fC,and the integral nonlinearity exceeds 0.35%.

关键词： Dark matter VLAST Nuclidedetector Prototype readout electronics VATA160 Large dynamic range Irradiationtest Performance test

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Opportunities for production and property research of neutron-rich nuclei around N=126 at HIAF

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Nuclear Science and Techniques 2024年第6期35卷 101-113页

作者： Shao-Bo Ma Li-Na Sheng Xue-Heng Zhang Shi-Tao Wang Kai-Long Wang Chun-Wang Ma Hool-Jin Ong Zhi-Yu Sun shu-wen tang Yu-Hong Yu Xin-Tong Du Xiao-Bao Wei Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000China University of Chinese Academy of Sciences Beijing 100049China College of Physics Henan Normal UniversityXinxiang 453007China Institute of Nuclear Science and Technology Henan Academy of ScienceZhengzhou 450046China Joint-Department for Nuclear Physics Lanzhou University and Institute of Modern PhysicsLanzhou 730000China Research Center for Nuclear Physics Osaka UniversityOsaka 567-0047Japan RIKEN Nishina Center Saitama 351-0198Japan Northwest Normal University Lanzhou 730070China

The study of nuclide production and its properties in the N=126 neutron-rich region is prevalent in nuclear physics and astrophysics *** upcoming High-energy FRagment Separator(HFRS)at the High-Intensity heavy-ion Accelerator Facility(HIAF),an in-flight separator at relativistic energies,is characterized by high beam intensity,large ion-optical acceptance,high magnetic rigidity,and high momentum resolution *** provides an opportunity to study the production and properties of neutron-rich nuclei around N=*** this paper,an experimental scheme is proposed to produce neutron-rich nuclei around N=126 and simultaneously measure their mass and lifetime based on the HFRS separator;the feasibility of this scheme is evaluated through *** results show that under the high-resolution optical mode,many new neutron-rich nuclei approaching the r-process abundance peak around A=195 can be produced for the first time,and many nuclei with unknown masses and lifetimes can be produced with high *** the time-of-flight corrected by the measured dispersive position and energy loss information,the cocktails produced from 208 Pb fragmentation can be unambiguously ***,the masses of some neutron-rich nuclei near N=126 can be measured with high precision using the time-of-flight magnetic rigidity *** indicates that the HIAF-HFRS facility has the potential for the production and property research of neutron-rich nuclei around N=126,which is of great significance for expanding the chart of nuclides,developing nuclear theories,and understanding the origin of heavy elements in the universe.

关键词： HFRS Fragmentation Neutron-rich nuclei around N=126 Mass measurement Lifetime

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A tracking system for the external target facility of CSR

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Nuclear Science and Techniques 2017年第5期28卷 68-73页

作者： shu-wen tang Shi-Tao Wang Li-Min Duan Zhi-Yu Sun Yu-Hong Yu Xue-Heng Zhang Ke Yue Chen-Gui Lu He-Run Yang Peng Ma Fang Fang Duo Yan Yu Sun Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049China

A tracking system composed of three multiwires proportional chambers(MWPCs) for the external target facility of the Cooler Storage Ring is reported in this paper. The active areas of the MWPCs are 518 mm 9400 mm, 582 mm 9 450 mm, and 710 mm 9 500 mm Each MWPC consists of a series of alternately placed cathode and anode wire planes and can measure position along the directions of-30°, 0°, and 30° relative to horizontal. The construction and operation of the detectors are described, and a method for track reconstruction is introduced. A track-finding efficiency of about 62% and a spatial resolution of 1.21 mm have been achieved. The pion and proton can be identified clearly with the tracking system combined with a time-of-flight system.

关键词： ETF MWPC Track reconstruction Spatial resolution

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Toward real-time digital pulse process algorithms for CsI(Tl)detector array at external target facility in HIRFL-CSR

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Nuclear Science and Techniques 2023年第9期34卷 8-20页

作者： Tao Liu Hai-Sheng Song Yu-Hong Yu Duo Yan Zhi-Yu Sun shu-wen tang Fen-Hua Lu Shi-Tao Wang Xue-Heng Zhang Xian-Qin Li Hai-Bo Yang Fang Fang Yong-Jie Zhang Shao-Bo Ma Hooi-Jin Ong Cheng-Xin Zhao Northwest Normal University Lanzhou 730070China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A fully digital data acquisition system based on a field-programmable gate array(FPGA) was developed for a CsI(Tl) array at the external target facility(ETF) in the Heavy Ion Research Facility in Lanzhou(HIRFL). To process the CsI(Tl) signals generated by γ-rays and light-charged ions, a scheme for digital pulse processing algorithms is proposed. Every step in the algorithms was benchmarked using standard γ and α sources. The scheme, which included a moving average filter, baseline restoration, leading-edge discrimination, moving window deconvolution, and digital charge comparison, was subsequently implemented on the FPGA. A good energy resolution of 5.7% for 1.33-MeV γ-rays and excellent α-γ identification using the digital charge comparison method were achieved, which satisfies CsI(Tl) array performance requirements.

关键词： CsI(Tl)array On-line digital algorithms Moving average filter Moving window deconvolution On-line particle identification algorithms

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Isotopic production cross sections of fragmentation residues produced by ^(18)O ions on a carbon target near 260 MeV/nucleon

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Chinese Physics C 2022年第11期46卷 1-6页

作者： Xiao-Dong Xu Ya-Zhou Sun Shi-Tao Wang Bo Mei shu-Ya Jin Xue-Heng Zhang Zhi-Yu Sun Yi-Xuan Zhao shu-wen tang Yu-Hong Yu Duo Yan Fang Fang Yong-Jie Zhang Shao-Bo Ma CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

The isotopic cross sections of residual nuclei produced in fragmentation reactions of ^(18)O projectiles impinging on a carbon target at energies near 260 MeV/nucleon were measured at the HIRFL facility in Lanzhou(China).A full identification of atomic and mass numbers of fragments was achieved from the determination of their magnetic rigidity,energy loss,and time of *** production cross sections for a dozen of nitrogen,carbon,and boron isotopes were determined with uncertainties below 30% for most of the *** obtained cross sections for N and B isotopes show a rather good agreement with previous experimental data obtained with different projectile *** cross sections for some C isotopes seem to exhibit a dependence on the projectile energy.A comparison of the data and several theoretical model calculations are presented.

关键词： heavy-ion collisions projectile fragmentation isotopic production cross sections

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Fragmentation of stable and neutron-rich ^(12-16)C into boron fragments at approximately 240 MeV/nucleon

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Chinese Physics C 2022年第1期46卷 118-123页

作者： shu-Ya Jin Ya-Zhou Sun Shi-Tao Wang Zhi-Yu Sun Xue-Heng Zhang Zhi-Qiang Chen Bo Mei Yi-Xuan Zhao shu-wen tang Yu-Hong Yu Duo Yan Fang Fang Yong-Jie Zhang Shao-bo Ma Xiang-Man Liu Rui Han CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100080China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China School of Physics and Electrical Engineering Anyang Normal UniversityAnyang 455000China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

The elemental fragmentation cross sections of boron fragments produced by stable and neutron-rich^(12-16)C beams with a carbon target were systematically measured at an incident beam energy of approximately 240 MeV/*** measured cross sections were found to increase as the projectile mass number *** observed feature is explained qualitatively based on the abrasion-ablation two-stage reaction model and is compared quantitatively with predictions from various reaction models,including empirical and statistical *** models agree with the measured cross sections within a factor of 2.

关键词： elemental fragmentation cross sections neutron-rich carbon isotopes abrasion-ablation model

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Repetitive traumatic brain injury–induced complement C1–related inflammation impairs long-term hippocampal neurogenesis

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Neural Regeneration Research 2025年第3期20卷 821-835页

作者： Jing Wang Bing Zhang Lanfang Li Xiaomei tang Jinyu Zeng Yige Song Chao Xu Kai Zhao Guoqiang Liu Youming Lu Xinyan Li Kai shu Department of Neurosurgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Department of Neurosurgery Shanxi Bethune HospitalShanxi Academy of Medical SciencesTongji Shanxi HospitalThird Hospital of Shanxi Medical UniversityTaiyuanShanxi ProvinceChina Department of Pathophysiology School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Institute for Brain Research Wuhan Center of Brain ScienceHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Department of Graduate Student Chongqing Medical UniversityChongqingChina Department of Basic Medicine School of Medical ScienceHubei University for NationalitiesEnshiHubei ProvinceChina Department of Anatomy School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Repetitive traumatic brain injury impacts adult neurogenesis in the hippocampal dentate gyrus,leading to long-term cognitive ***,the mechanism underlying this neurogenesis impairment remains *** this study,we established a male mouse model of repetitive traumatic brain injury and performed long-term evaluation of neurogenesis of the hippocampal dentate gyrus after repetitive traumatic brain *** results showed that repetitive traumatic brain injury inhibited neural stem cell proliferation and development,delayed neuronal maturation,and reduced the complexity of neuronal dendrites and *** with repetitive traumatic brain injuryalso showed deficits in spatial memory ***,following repetitive traumatic brain injury,neuroinflammation was enhanced in the neurogenesis microenvironment where C1q levels were increased,C1q binding protein levels were decreased,and canonical Wnt/β-catenin signaling was *** inhibitor of C1 reversed the long-term impairment of neurogenesis induced by repetitive traumatic brain injury and improved neurological *** findings suggest that repetitive traumatic brain injury–induced C1-related inflammation impairs long-term neurogenesis in the dentate gyrus and contributes to spatial memory retrieval dysfunction.

关键词： complement C1 dendrite dentate gyrus hippocampus neural stem cell neurogenesis neuroinflammation neurological function neuron traumatic brain injury

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