State Key Laboratory of Intense Pulsed Radiation Simulation and Effect

Fengcheng, China

State Key Laboratory of Intense Pulsed Radiation Simulation and Effect

Fengcheng, China

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Cui Z.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Cui Z.,Polytechnic of Milan | Grassi F.,Polytechnic of Milan | Pignari S.A.,Polytechnic of Milan
2016 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2016 | Year: 2016

With the final objective to assure equivalence between radiated and conducted immunity testing to intense electromagnetic pulses, in this work a circuit model of a typical pulsed current injection (PCI) test setup is derived, implemented in SPICE, and validated by measurement. By virtue of such a model, the parameters of the discharge circuit of the pulse generator can be adjusted to compensate the waveform distortion introduced by the injection probe. As proven by an example, the proposed method allows reproducing at the input of the equipment under test a transient disturbance with expected characteristics (i.e., amplitude, rise time, and pulse width). © 2016 IEEE.


Wang B.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Wang B.,Tsinghua University | Zheng S.,Tsinghua University | Wu L.,Tsinghua University | And 5 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2016

A fiducialization method based on vibrating wire is described dedicated to the problem of locating the magnetic center relative to external fiducials for the small-aperture quadrupoles. The advantage of this method is that the measurement of the wire position, which may be the main error source, is no longer needed. The position of the magnetic center can be directly obtained by measuring the position shift of the magnet fiducials. This method has been validated on small Permanent Magnet Quadrupoles (PMQs). Experiments have confirmed its feasibility of measuring PMQs with good repeatability of about 10 μm, and shown its high sensitivity as well as convenience. © 2015 Elsevier B.V. All rights reserved.


Zhang G.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Zhang G.,Northwest Institute of Nuclear Technology | Wang H.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Wang H.,Northwest Institute of Nuclear Technology | And 10 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2015

The propagation properties of large size TEM antennas are experimentally studied. The size of the TEM antennas is 60 m×20 m×10 m and the character impedance is 120 Ω. A kind of dielectric foil switch is designed compactly with TEM antennas which can generate a double exponential waveform with an altitude of 10 kV and a rise time of 1.2 ns. The radiated field distribution is measured. The relationship between the rise time/altitude and the distance is provided, and the propagation properties of large size TEM antennas are summarized. The results show that the rise time along the transmission distance increases. The transmission distance is 50 m and the rise time increases about 1.2 ns. An exponential decay trend of electric field amplitude with the transmission distance. This work is valuable for the design of large size guided wave simulator. ©, 2015, Editorial Office of High Power Laser and Particle Beams. All right reserved.


Liu L.,Northwest Institute of Nuclear Technology | Li B.,Northwest Institute of Nuclear Technology | Li B.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Yang S.,Northwest Institute of Nuclear Technology | And 4 more authors.
Guangxue Jishu/Optical Technique | Year: 2015

Active imaging based on laser illuminating is a comprehensive technology, which integrates laser technology, imaging technology and imaging processing technology of faint target. The principle of laser active imaging and the influence of the medium's scattering effect on imaging quality in the environment of highly scattering medium are described. Also the main methods presently to reduce the influence of scattered light are detailed expounded, and the characteristics and application areas of various imaging methods are analyzed. Finally the development trend of laser active imaging technology in highly scattering medium is discussed. ©, 2014, Editorial Board of Optical Technique. All right reserved.


Liu L.,Northwest Institute of Nuclear Technology | Li B.,Northwest Institute of Nuclear Technology | Li B.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Yang S.,Northwest Institute of Nuclear Technology | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Target detection in smoke environment using laser active imaging is of great research significance. According to the characteristics of light propagating in smoke environment, the method of laser transmission imaging is adopted and polarization-difference (PD) imaging technology is used to suppress the effect of scattering light on imaging quality. PD imaging method needs to record two target images of different polarization directions and then the two images are subtracted. A correction factor α is used to match the scattering light intensity of the two images, so scattering light can be mostly filtered out. Experiments show that the quality of images obtained by PD imaging method is better than intensity ones. The PD images have big noisy when smoke concentration is high. A method which combines median filtering with multi-scale morphological edge detection is proposed to process images. It can suppress image noise, improve image contrast and edge sharpness effectively. © 2015 SPIE.


Zhang M.,Northwest Institute of Nuclear Technology | Zhang M.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Peng B.D.,Northwest Institute of Nuclear Technology | Peng B.D.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | And 18 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2015

A Maximum Likelihood image reconstruction technique has been applied to neutron scatter imaging. The response function of the imaging system can be obtained by Monte Carlo simulation, which is very time-consuming if the number of image pixels and particles is large. In this work, to improve time efficiency, an analytical approach based on the probability of neutron interaction and transport in the detector is developed to calculate the system response function. The response function was applied to calculate the relative efficiency of the neutron scatter imaging system as a function of the incident neutron energy. The calculated results agreed with simulations by the MCNP5 software. Then the maximum likelihood expectation maximization (MLEM) reconstruction method with the system response function was used to reconstruct data simulated by Monte Carlo method. The results showed that there was good consistency between the reconstruction position and true position. Compared with back-projection reconstruction, the improvement in image quality was obvious, and the locations could be discerned easily for multiple radiation point © 2014 Published by Elsevier B.V. All rights reserved. sources.


Sun J.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Sun J.,Northwest Institute of Nuclear Technology | Hu Y.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Hu Y.,Northwest Institute of Nuclear Technology | And 5 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2015

Electron incident angles have a heavy effect on the energy deposition profile (EDP) in material of the intense pulsed electron beam. The average of electron incident angles must be taken into consideration when carrying out the diagnosis technology research and numerical simulation study, while a widely received method to solve the problem has not yet been presented. This article gives a qualitative analysis on the energy deposition function, which is formed by the energy loss function and energy deposition efficiency function. An average method of electron beam incident angles based on EDP, which is named as EDP average method, is developed, and a qualitative explanation of the electron beam EDP curve is given. The error and applicability of this method are analyzed. M-C tests are designed for comparison with theoretical analysis. The EDP average method has a better performance in calculation of the EDP than the method using arithmetic average directly, especially in the shallow of target material. ©, 2015, Editorial Office of High Power Laser and Particle Beams. All right reserved.


Zhu X.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Wang J.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Wang J.,Xi'an Jiaotong University | Zhang G.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Chen W.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect
Progress in Electromagnetics Research Symposium | Year: 2014

Parallelized finite-difference time-domain (FDTD) method for simulating the near-fields of flat-plate bounded wave electromagnetic pulse (EMP) simulator with distributed terminator and plane source is presented. The effect of some simulator's model-parameters to the vertical electric fields of the test points at the half-height in the simulator is simulated and analyzed.


PubMed | State Key Laboratory of Intense Pulsed Radiation Simulation and Effect and Xi'an Jiaotong University
Type: Journal Article | Journal: The Review of scientific instruments | Year: 2016

Coupled by the Marx of the JianGuang-I facility, a high voltage, low time-delay trigger generator was developed. Working principles of this trigger generator and its key issues were described in detail. Structures of this generator were also carefully designed and optimized. Based on the JianGuang-I Marx generator, a test stand was established. And a series of experiment tests were carried out to the study performance of this trigger generator. Experiment results show that the output voltage of this trigger generator can be continuously adjusted from 58 kV to 384 kV. The time delay (from the beginning of the Marx-discharging pulse to the time that the output pulse of the trigger generator arises) of this trigger pulse is about 200 ns and its peak time (0%100%) is less than 50 ns. Experiment results also indicate that the time-delay jitter of trigger voltages decreases rapidly with the increase in the peak voltage of trigger pulses. When the trigger voltage is higher than 250 kV, the time-delay jitters (the standard deviation) are less than 7.7 ns.


Ruibin L.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Qiang M.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Chao Q.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | Guizhen W.,State Key Laboratory of Intense Pulsed Radiation Simulation and Effect | And 2 more authors.
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference | Year: 2013

"QiangGuang-I", working at short pulse state, can be used to research the transient radiation effects on electronic devices. The measurement of dose rate is significant for assessing devices' radiation-resistant ability. This paper comprehensively analyzes the originations of uncertainty on dose rate's measurement, such as thermoluminescent dosemeter's linearity degree and response to X-rays energy spectrum, testing instruments' resolution, waveforms' transmission distortion , and positional error; figures out the extended uncertainty. The result shows that the extended uncertainty of dose rate's measurement is less than 20%, which is satisfactory for researching on devices' transient radiation effects, and proves that the method used to measure dose rate is reasonable.

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