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2023 International Conference on Power System Technology, PowerCon 2023

作者： Qin, Feng Li, Simeng Chen, Wei Zhan, Ran Nie, Xin Wu, Wei Northwest Institute of Nuclear Technology National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an China Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China School of Physics & Information Technology Shaanxi Normal University Xi'an China

ISBN: (纸本)9798350300222

Based on the nanosecond pulse impact test of a real-type transformer, the variation law of the transformer's transient transfer characteristics was obtained. By analyzing the differences of the transfer characteristics in a specific frequency band under different accumulated pulse numbers, an insulation assessment function of the transformer under the cumulative effect of nanosecond pulses was constructed based on the transfer characteristics. The research results show that the current transfer characteristics reflect the cumulative deterioration degree of the transformer insulation most sensitively, and the transfer ratio constantly decreases with the increase of the accumulated pulse number. Through fitting, the insulation assessment function of the transformer under the nanosecond pulse effect can be obtained. Finally, the accuracy and effectiveness of the method were verified by conducting five different accumulated impact tests on a distribution transformer of the same type. © 2023 IEEE.

关键词： Insulation

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Achieving 2.1%Effciency in Alpha-Voltaic Cell Based on Silicon Carbide Transducer

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Energy & environmental Materials 2025年第2期8卷 305-311页

作者： Runlong Gao Wuying Ma Pengying Wan Ao Liu Xiao Ouyang Xue Du Qiantao Lei Qi Deng Linyue Liu Xiaoping Ouyang Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China School of Microelectronics Xi'an Jiaotong UniversityXi’an 710049China State Key Laboratory of Wide-Bandgap Semiconductor Power Electronic Devices Nanjing Electronic Devices InstituteNanjingJiangsu 210016China Key Laboratory of Beam Technology of Ministry of Education School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

Alpha-voltaic cell is a type of micro nuclear battery that provides several decades of reliable power in the nano watt to microwatt range,supplying for special applications where traditional chemical batteries or solar cells are difficult to ***,the power conversion efficiency of the alpha-voltaic cells reported are still far behind the theoretical limit,making the development of alpha-voltaic cell *** advanced semiconductor transducers with higher efficiency in converting the energy of alpha particles into electric energy is proving to be necessary for realizing high-power conversion ***,we propose an alpha-voltaic cell based on SiC PIN transducer that includes a sensitive region with an area of 1 cm^(2),a width of 51.2μm,and a charge collection efficiency of 95.6%at 0 V *** find that optimizing the unintentional doping concentration and crystal quality of the SiC epitaxial layer can significantly increase the absorption and utilization of the energy of alpha particles,resulting in a 2.4-fold enhancement in power conversion efficiency compared with that of the previous *** properties of the SiC alpha-voltaic cell are measured using an He-ion accelerator as the equivalentα-radioisotopes,with the best power conversion efficiency of 2.10%and maximum output power density of 406.66 nW cm-2 is *** research makes a big leap in SiC alpha-voltaic cell,bridging the gap between micro nuclear batteries and practical applications in micro-electromechanical systems,micro aerial vehicles,and tiny satellites.

关键词： alpha-voltaiccell high-powerconversionefficiency nuclearbattery SiCPIN transducer

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A High Precision Parameter Estimation Method of Double Exponential pulse Based on Artificial Neural Network

A High Precision Parameter Estimation Method of Double Expon...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Zhizhen Zhu Jing Yang Yuewu Shi Zheng Liu Xin Nie State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an China

Double exponential pulse is the waveform of high-power electromagnetic environments. 10-90% rise time $t_{r}$ and pulse width at half maximum $t_{w}$ are the important parameters of the waveform. They can be determined by $\alpha$ and $\beta$ which are the key parameters of double exponential function. The transformation from $t_{r},\ t_{w}$ to $\alpha,\ \beta$ is frequently used and very necessary in EM simulation and data analysis. In this paper, based on artificial neural network we create a new training data set and establish a simple architecture. $\alpha,\ \beta$ can be given out directly from the model. Compared to piecewise linear fitting and look-up table method, the method proposed in this paper has the advantages of both high precision and small amount of pre-processing data. The maximum estimation error of both $\alpha$ and $\beta$ is less than 0.1%.

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Ablation of Aluminum Foil by Strong pulsed Optical radiation of Metallic Plasma Jet 5

Ablation of Aluminum Foil by Strong Pulsed Optical Radiation...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Cao, Yuchen Han, Ruoyu Yuan, Wei Li, Chen Yao, Weibo Zhang, Yongmin Beijing Institute of Technology School of Physics Beijing China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an China Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In recent years, capillary discharge plasma has been popular in propulsion, fusion and other fields, and is usually regarded as a high heat flux source for material research. Metal wires are often selected as the ignition for capillary discharge because of the low ignition time dispersion. Focused on the phenomenon of radiation ablation, experiments were carried out to determine the evolution of metallic plasma jets and the mechanism of aluminum foil ablation. It was found that the placement of aluminum foil at the nozzle had little influence on capillary discharge, but more regular boundaries could be observed. The mechanism of aluminum foil burning and burning through was studied in terms of the radiation heat wave conduction, corresponding to 'propagation' and 'burn through' modes respectively. © 2022 IEEE.

关键词： Ablation

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simulation of near-surface propagation of powerful electromagnetic pulse based on spherical coordinates 2

Simulation of near-surface propagation of powerful electroma...

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2nd IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

作者： Wang, Wenbing Chen, Yinhui Simulation and Effect [Northwest Institute of Nuclear Technology State Key Laboratory of Intense Pulsed Radiation Xi'an China

ISBN: (纸本)9781728190181

It is necessary to study the propagation of the powerful electromagnetic pulse in the near-surface space because most of the electronic systems are located on the ground. Usually, it is complicated to separate the ground from the air using different coordinate systems. Based on spherical coordinates, a physical model of powerful electromagnetic pulse propagation in near-surface space is established, and the correct of algorithm is proved by an analytical example. Finally, the regularity of powerful electromagnetic pulse propagation in near-surface space is given according to Bell source waveform. © 2021 IEEE.

关键词： Electromagnetic pulse

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SEU effects induced by Reactor Spallation and Accelerator neutron sources in Nano-SRAMs 4

SEU effects induced by Reactor Spallation and Accelerator ne...

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4th International Conference on radiation effects of Electronic Devices, ICREED 2021

作者： Li, Junlin Chen, Wei Wu, Wei Jin, Xiaoming Li, Ruibin Qi, Chao Liu, Minbo Liu, Yan State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an China

ISBN: (纸本)9781665441681

This paper presents the experimental research of neutron induced single event upset (SEU) in Nano-SRAMs which was carried out in CSNS (China Spallation Neutron Source), CIAE (China institute of atomic energy) and XAPR (Xi'an pulsed reactor). The SEU cross section of Nano-SRAMs with four different feature sizes were measured. Experimental results indicated that the neutron induced SEU cross section were heavily dependent on the feature size of SRAM and the data pattern written to SRAM had little impact on the SEU cross section. We compared experimental results of white neutrons from CSNS to 2.5Mev, 14MeV neutrons from CIAE and reactor neutrons from XAPR. The comparison results showed that the neutron induced SEU cross section had a strong dependence on the energy of incident neutron. And the SEU cross section of Nano-SRAMs varies with different feature sizes obtained from different neutron sources has the same tendency. © 2021 IEEE

关键词： Neutron sources

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The parameter estimation of double exponential pulse based on a least infinity norm fitting method 2

The parameter estimation of double exponential pulse based o...

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2021 2nd International Conference on Applied Physics and Computing, ICAPC 2021

作者： Shi, Yuewu Wang, Wei Zhu, Zhizhen Nie, Xin State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an China

This paper presents an estimation method of double exponential pulse (DEP) between the physical parameters rise time (tr), full width at half maximum amplitude (tFWHM) and the mathematical parameters a, ß. A newly fitting method based on the least infinity norm criterion is proposed to deal with the estimation problem of DEP. The calculation process and equation of parameters of this method is proposed based on an m-th-order polynomial fitting model. This estimation method is compared with the least square method by the same data and fitting function. The results show that the maximum estimation error of parameters of double exponential pulse obtained by the least infinity norm method is 1.5 %. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Parameter estimation

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Observation and mitigation of image distortion in high-energy electron radiography

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Nuclear Science and Techniques 2023年第6期34卷 69-77页

作者： Hao-Qing Li Liang Sheng Chang-Qing Zhang Ying-Chao Du Zheng Zhou Xiu-Feng Weng Jia-Hao Xiao Hong-Qiao Yin Bin Sun Kun Wei Yang Li Bao-Jun Duan Yong-Tang Liu Yan-Hong Zhang Mei Zhang Yan Song Xiao-Dong Zhang Jun Liu Zhu-Ming Fu Qing Xu Xue Du Jian-Peng Gao Xin-Yi Wang Xin-Jian Tan Dong-Wei Hei Department of Engineering Physics Tsinghua UniversityBeijing100084China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an710024China Institute of Applied Electronics China Academy of Engineering PhysicsMianyang621900China Institute of Intelligent Machines Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei230031China Zhongke Hefei Institutes of Collaborative Research and Innovation for Intelligent Agriculture Hefei231131China

Image distortion caused by the angular misalignment of quadrupole magnets in high-energy electron radiography has been studied *** propose that the distortion originates from the coupling of the electron motions in the transverse directions,based on a theoretical analysis and the transfer-matrix *** relative angular rotation between the second and third magnetic quadrupoles was identified as the main contributor to image *** was verified by both a beam-dynamics simulation and *** strategies to mitigate this image distortion are also explored,including magnets online tuning,higher beam energy and larger magnification *** study provides criteria for designing experiments and paves the way for achieving higher image precision.

关键词： Misalignment Angular rotation Russian quadruplet Transfer matrix

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Test and response analysis of shielding performance of the cable under HEMP irradiation 7

Test and response analysis of shielding performance of the c...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and simulation, CDMMS 2020

作者： Wang, Wenbing Wang, Xutong Chen, Yinhui Sun, Beiyun State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an China

The shielding efficiency of coaxial cable is characterized by its antiinterference ability in electromagnetic environment. The testing methods include three-axis method, GTEM chamber method, line injection method, power absorption clamp method, reverberation chamber method and so on. In practical application, it is found that the shielding performance of the cable under high altitude electromagnetic pulse (HEMP) does not accord with the shielding efficiency measured by the cable. While a typical multi-layer shielded cable is selected as the test object, a test method is designed and tested under electromagnetic simulator, and then the test results are verified and extended by CST simulation. Finally, the reason of this phenomenon is analysed theoretically, which has important reference significance for the prediction and testing of shielding efficiency of cable in HEMP environment. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Electromagnetic pulse

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Prediction of electromagnetic pulse irradiation response based on support vector machine 7

Prediction of electromagnetic pulse irradiation response bas...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and simulation, CDMMS 2020

作者： Liu, Yifei Wu, Wei Cheng, Yinhui Zhao, Mo Ma, Liang Guo, Jinghai State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an China

Due to the complexity of electromagnetic simulation method based on the the mechanism analysis, this paper studies the feasibility of the system identification modeling method based on support vector machine for the prediction of electromagnetic pulse response of electronic equipment, and introduces the genetic algorithm for the model parameter selection. First, we use this method to verify the response of cable irradiated by the EMP. The results show that this method can accurately predict the cable response under different pulse front. Then, we use the experiment data of an UAV electronics system irradiated by the electromagnetic pulse to model and test. The results show that when using the low-amplitude field-strength data as the model training set, the identification model can accurately predict the pulse-coupling waveform under high field strength. The successful application of this method provides a simple and efficient simulation technique for the prediction of electromagnetic pulse response of electronic equipment, which has certain application prospect. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Genetic algorithms

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