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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Du, Chuanbao Ma, Wanzhi Mao, Congguang Northwest Institute of Nuclear Technology State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an710000 China University of Electronic Science and Technology of China National Key Lab of Communications Chendu610054 China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

In this article, technical problems existing in the electromagnetic environmental effect (E3) on electronic systems are investigated, such as electromagnetic (EM) stress and effect data acquisition. Considering that the software-defined radio (SDR) has the capability of module reconfiguration, it is introduced into the electromagnetic (EM) risk assessment, and thus an experimental platform is designed based on SDR for high-power electromagnetic (HPEM) effect on wireless communication systems. The platform is composed of a multi-band RF transceiver, a baseband data processor with SDR, a monitoring EM stress subsystem and an effect database. Additionally, the potential applications of the platform in EM environment prediction, EM stress modeling, effect analysis are also illustrated. © 2022 IEEE.

关键词： Risk assessment

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Cross section measurement for the ^(232)Th(n,f)reaction in the 4.50−5.40 MeV region using a time projection chamber

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Chinese Physics C 2024年第10期48卷 157-167页

作者： Haofan Bai Han Yi Yankun Sun Yiwei Hu Jie Liu Zepeng Wu Cong Xia Wenkai Ren Wentian Cao Tieshuan Fan Guohui Zhang Ruirui Fan Yang Li Wei Jiang Yonghao Chen You Lv Changjun Ning Weihua Jia Zhiyong Zhang Haolei Chen Zhen Chen Maoyuan Zhao Changqing Feng Shubin Liu State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsPeking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi'an 710024China Department of Nuclear Science and Technology School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China 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

Accurate cross sections of neutron induced fission reactions are required in the design of advanced nuclear systems and the development of fission *** projection chambers(TPCs),with their track reconstruction and particle identification capabilities,are considered the best detectors for high-precision fission cross section *** TPC developed by the back-streaming white neutron source(Back-n)team of the China Spallation Neutron Source(CSNS)was used as the fission fragment detector in *** this study,the cross sections of the ^(232)Th(n,f)reaction at five neutron energies in the 4.50−5.40 MeV region were *** fission fragments and α particles were well identified using our TPC,which led to a higher detection efficiency of the fission fragments and smaller uncertainty of the measured cross *** is the first measurement of the ^(232)Th(n,f)reaction using a TPC for the detection of fission *** uncertainties less than 5%,our cross sections are consistent with the data in different evaluation libraries,including JENDL-4.0,ROSFOND-2010,CENDL-3.2,ENDF/B-VⅢ.0,and BROND-3.1,whose uncertainties can be reduced after future improvement of the measurement.

关键词： ^(232)Th(n,f)fission cross section time projection chamber(TPC) ^(232)Th

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Increasing Electric Field Uniformity in Insulator Under pulse Excitation by Varying Its Conductivity

Increasing Electric Field Uniformity in Insulator Under Puls...

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2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Mao, Minyu Chen, Zhiqiang Shao, Jinghui Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an710049 China Northwest Institute of Nuclear Technology State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an710024 China

ISBN: (纸本)9781665452366

In this paper, how the electrical conductivity affects electric field distribution uniformity in a cylindrical insulator under double exponential pulse excitation is investigated. The underlying basis is the vectorial-scalar potential equations and the mathematical model is developed in COMSOL and solved with its internal solver. It is found that by regulating the inhomogeneous conductivity of the insulator, the purpose of controlling the conduction current of the material and thus improving the electric field distribution uniformity in the interior and along the surface can be achieved. © 2022 IEEE.

关键词： Maxwell equations

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Advances in Metal Halide Perovskite Scintillators for X-Ray Detection

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Nano-Micro Letters 2025年第1期17卷 1-38页

作者： Wang, Ting Zeng, Guoqiang Yang, Yang Michael Yang, Zhi Wang, Tianchi Li, Hao Han, Lulu Yu, Xue Xu, Xuhui Ouyang, Xiaoping College of Materials and Chemistry & Chemical Engineering Nuclear Technology Key Laboratory of Earth Science Chengdu University of Technology Chengdu610059 China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China Nuclear Technology Key Laboratory of Earth Science Chengdu University of Technology Chengdu610059 China Faculty of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Kunming650093 China Key Laboratory of Materials Physics of Ministry of Education Laboratory of Zhongyuan Light School of Physics Zhengzhou University Zhengzhou450051 China State Key Laboratory of Modern Optical Instrumentation Institute for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou310027 China School of Mechanical Engineering Institute for Advanced Materials Chengdu University Chengdu610106 China

The review highlights recent advancements in enhancing the intrinsic physical properties of metal halide perovskite scintillators, such as improving light yield and response times, to improve their X-ray detection performance. It discusses innovative engineering strategies to effectively optimize radioluminescent light management for high-resolution X-ray imaging. The problems encountered in the application of metal halides perovskites materials for X-ray detection are summarized, and the potential development direction in the future is prospected. © The Author(s) 2025.

关键词： Scintillation counters

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Research on arc discharge characteristics of metal-doped copper photocathodes

Research on arc discharge characteristics of metal-doped cop...

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IEEE International Conference on Plasma Science (ICOPS)

作者： Y. Yang P. Liang X. Weng C. Kong State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an China School Of Physics Xi’an Jiaotong University Xi’an China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

The photocathode microwave electron gun is an electron beam source that employs the photoelectric effect to generate an electron beam. This beam is then accelerated by a high-amplitude electric field within a microwave cavity, allowing it to quickly attain relativistic energies. Such devices have seen widespread use in fourth-generation light source projects worldwide and have also been utilized in highbrightness applications. An effective method to enhance the electrode’s voltage resistance and to reduce field emission dark current is to create a copper-based solid solution by incorporating a small amount of a secondary metallic element. This study examines the arc discharge characteristics of Cu photocathode materials, as well as CuAu, CuAg, and CuCr photocathode materials containing 1wt.%/5wt.% secondary metal, all prepared via vacuum arc melting. Using a vacuum electrical breakdown experimental setup, these materials were tested under conditions of an 8 kV breakdown voltage and 20 breakdown events. The findings indicate that the addition of $\mathrm{Au}, \mathrm{Ag}$, and Cr as secondary phases increases the breakdown resistance of the copper photocathode. Specifically, the inclusion of Ag proves to be the most advantageous for enhancing the copper photocathode’s breakdown resistance, resulting in an increase of $32.3 \%$ with 1 wt. % of Ag and $61.4 \%$ with $5 \mathrm{wt}. \%$ of Ag, respectively.

关键词： Resistance Microwave integrated circuits Electric breakdown Electron beams Microwave devices Arc discharges Microwave theory and techniques

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Single event transient characterization of SiGe HBT by SPA experiment and 3-D process simulation

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Science China(Technological Sciences) 2022年第5期65卷 1193-1205页

作者： PAN XiaoYu GUO HongXia FENG YaHui LIU YiNong ZHANG JinXin LI Zhuang LUO YinHong ZHANG FengQi WANG Tan ZHAO Wen DING LiLi XU JingYan The Key Laboratory of Particle and Radiation Imaging Ministry of EducationDepartment of Engineering PhysicsTsinghua UniversityBeijing100084China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an710024China School of Materials Science and Engineering Xiangtan UniversityXiangtan411105China School of Aerospace Science and Technology Xidian UniversityXi’an710126China The 38th Research Institute of China Electronics Technology Group Corporation Hefei230088China

The single-photon absorption induced single event transient in the silicon-germanium heterojunction bipolar transistor is *** laser wavelength and bias condition have been proven to have significant impacts on the characterization of the single event transient(SET) response of the device by two-dimensional(2-D) raster *** optical analytical calculation,the laser-induced charge distribution is well-embedded in the 3-D TCAD process simulation conducted to explore the underlying physical *** addition to the ion shunt effect,the excess electron injection from the emitter to the base could play a vital role in the SET peak amplitude and charge *** impact of the metal layer on the SPA experimental results is also determined by establishing a figure of merit that will help researchers estimate the laser-induced transient sensitivity of devices with metal layer blocking.

关键词： silicon-germanium HBT single-photon absorption TCAD simulation single event transient

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Investigation and Design of Fast Front Marx Generator Trigger 5

Investigation and Design of Fast Front Marx Generator Trigge...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Yifan, Wang Wei, Jia Zhiqiang, Chen Fan, Guo Ling, Shi Hongshun, Liu Shandong University Shandong Provincial Key Laboratory of Uhv Transmission Technology and Equipment Shandong Province Jinan China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Shaanxi Province Xi'an China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In order to provide a Marx generator with pulses with adjustable amplitude of 50 100kV, leading edge less than 30ns and half height width more than 200ns, a Marx trigger with unilateral charging is designed. The whole circuit simulation model is established, and the influence of spurious capacitance and switch inductance on the output waveform is analyzed by simulation. The functions of circuit parameters and waveform parameters are obtained by fitting. © 2022 IEEE.

关键词： Capacitance

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Efficient Absorbing Boundary for LADI-FDTD Method*

Efficient Absorbing Boundary for LADI-FDTD Method*

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Wang Wenbing Zhao Mo Wang Xutong Liu Yifei Guo Jinghai State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an People's Republic of China

The finite difference time domain (FDTD) method is one of the most universal numerical methods for calculating electromagnetic problem. The conventional FDTD method was limited by the stability condition named CFL (Courant, Friedrichs and Lewy), and the calculation efficiency to be low. However, a method called leapfrog alternating direction implicit finite difference time domain (LADI-FDTD) was proposed, it was proved to be unconditional stability and have high computational efficiency. Moreover, the setting of absorbing boundary conditions plays an important role in FDTD. A new absorbing boundary based on Huygens surface combined with other boundary is applied to LADI-FDTD method, and its iterative equations were derived, it's obviously that is simple and easy to realize. Finally, the excellent absorbing performance of the boundary based on Huygens surface was verified by numerical calculation, which can significantly improve the efficiency of the method.

关键词：

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Ultrafast Luminescence of CsF Crystal

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IEEE Transactions on Nuclear Science 2024年

作者： Wang, Ruichen Guo, Chan Peng, Chen Yan, Xinlong Jia, Yuzhen Zhang, Kan Lu, Yi Duan, Weiheng He, Weimin Yang, Weihu Han, Hetong Song, Zhaohui Yang, Fan Nankai University Key Laboratory of Weak Light Nonlinear Photonics Ministry of Education School of Physics Tianjin300071 China Northwest Institute of Nuclear Technology State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an710024 China

CsF crystal is known as an ultrafast scintillation crystal because of its cross-luminescence. Meanwhile, it also has a moderate Zeff and its luminescence wavelength matches well with the high quantum efficiency wavelength of commercial photodetectors. However, it is reported that CsF crystal shows low light yield and poor energy resolution, which limits its application. In the investigation, the large CsF crystals are grown in various atmospheres. By comparing the transmission, photoluminescence (PL) and X-ray excited luminescence (XEL) spectra of the samples grown at different atmosphere, the luminescence bands peaking at 340 and 430 nm are observed. It is speculated that they may be induced by the oxygen related color centers and F- vacancies related color centers. The ultrafast decay time of 340 and 430 nm luminescence is as short as 0.4 and 1.5 ns, respectively. Their intensity depends on the oxygen concentration of the crystal growth atmosphere. Meanwhile, the CsF crystal with strong 340 nm luminescence shows better light yield. And its energy resolution reaches 12.5% at 511 keV, which is comparable to BGO crystal. Although 340 and 430 nm luminescence has a slow component with approximately 22 ns decay time, it is only 8.6% of total scintillation light. The scintillation decay times excited by 511 keV gamma-rays are 3.8 (91.4%) and 21.5 ns (8.6%), which is not significantly increased by the color center induced luminescence. The results demonstrate the CsF crystal has application potential in ultrafast radiation detection. © 1963-2012 IEEE.

关键词： Gamma rays

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TRANSIENT RESPONSE CHARACTERISTICS OF METAL OXIDE ARRESTER UNDER HIGH ALTITUDE ELECTROMAGNTIC pulse 22

TRANSIENT RESPONSE CHARACTERISTICS OF METAL OXIDE ARRESTER U...

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22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Qin, Feng Wang, Xutong Wang, Haiyang Huang, Tao Nie, Xin Chen, Wei Northwest Institute of Nuclear Technology Xi'an China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an China

ISBN: (纸本)9781839536052

In order to study the strong electromagnetic pulse effect of the critical vulnerable equipment of power system and evaluate the survival ability of the high-altitude electromagnetic pulse, it is necessary to study the transient response characteristics of the metal oxide arrester to the high-altitude electromagnetic pulse by experiment. In this paper, an experimental platform of high altitude electromagnetic pulse conduction current injection for a typical 10kV metal oxide arrester is set up, and the key parameters such as peak value of overshoot voltage, peak value of residual voltage, action voltage and response time are obtained by the experiment. The results show that: the action voltage of this type of metal oxide arrester is 3.53 times higher than that of its rated voltage, the peak value of overshoot voltage is 2.20 times higher and the peak value of residual voltage is 1.57 times higher than the residual voltage under the lightning impulse current, and the response time varies little with the electromagnetic pulse conduction current amplitude, with an average of 45.86 nanoseconds under high altitude electromagnetic pulse conduction environment. © 2021 The Institution of Engineering and Technology.

关键词： Electromagnetic pulse

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