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Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode

Plasma Science and Technology 2025年第4期27卷 88-94页

作者： Mengfan ZHANG Dingguo LAI Qifu XU Mengtong QIU National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024People’s Republic of China Department of Engineering Physics Tsinghua UniversityBeijing 100084People’s Republic of China

The cylindrical virtual cathode reflex triode is a new type of pulsed hard X-ray load,which has the advantages of simple structure,high radiation conversion efficiency,and simplicity in seriesparallel *** paper presents a method to reduce the impedance of the triode using a multiring *** average electric field on the ring-cathode emission surface is enhanced due to edge effect,and the beam intensity is greatly increased in proportion to the square of the electric field ***-ring cathode is used to enlarge the emission ***,the reflex triode can work at lower impedance and generate a stronger beam under the same anode-cathode *** addition,the electric field enhancement of the cathode reduces the cathode emission stabilization time and enhances the operation stability of the *** effects of parameters such as ring width and ring gap on the triode impedance are simulated and *** cathode emission stabilization time and the X-ray conversion efficiency are *** design basis of cathode structure parameters and the impedance control method of the cylindrical virtual cathode reflex triode are given according to the simulations.

关键词： pulsed hard X-ray reflex triode high current electron beam bremsstrahlung(Some figures may appear in colour only in the online journal)

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A 200 kV Trigger Generator Based on Pseudospark Switch and Pre-Ionized Peaking Switch 11th

A 200 kV Trigger Generator Based on Pseudospark Switch and ...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Zhai, Rongxiao Yin, Jiahui Hu, Yixiang Zhang, Tianyang Qiu, Mengtong Wu, Qilin Cong, Peitian National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China

ISBN: (纸本)9789819787791

In pulsed power systems, the trigger generator is the component to generate electrical trigger pulses. Based on a pseudospark switch, a pulse transformer and a pre-ionized peaking switch, a 200 kV trigger generator with stable output, fast rise-time, and wide pulse width is designed and constructed. The operating theory of the trigger generator is described. The design and experiment of each main component are introduced. A pre-ionized peaking switch with novel working principle and structure is investigated. The experiment results of the trigger generator show that the amplitude of the output voltage is between 210 kV and 218 kV with a standard deviation of 1.8 kV. The rise time (from 10%–90% of the peak voltage) and the rise rate of the output trigger pulse are 17 ns and 11 kV/ns, respectively. The pulse width above 160 kV is about 300 ns. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Pulse transformers

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Experimental determination of stripping foil thickness on the XiPAF synchrotron

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Nuclear Science and Techniques 2025年第3期36卷 27-37页

作者： Xiao-Yu Liu Hong-Juan Yao Shu-Xin Zheng Ze-Jiang Wang Yang Xiong Pei-Zhi Fang Zhong-Ming Wang Key Laboratory of Particle&Radiation Imaging Tsinghua UniversityBeijing 100084China Laboratory for Advanced Radiation Sources and Application Tsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China

Stripping injection overcomes the limitations of Liouville's theorem and is widely used for beam injection and accumulation in high-intensity *** interaction between the stripping foil and beam is crucial in the study of stripping injection,particularly in low-energy stripping injection synchrotrons,such as the XiPAF *** foil thickness is the main parameter that affects the properties of the beam after *** thin stripping foil is reinforced with collodion during its ***,the collodion on the foil surface makes it difficult to determine its equivalent thickness,because the mechanical measurements are not sufficiently reliable or convenient for continuously determining foil *** propose an online stripping foil thickness measurement method based on the ionization energy loss effect,which is suitable for any foil thickness and does not require additional *** studies were conducted using the XiPAF *** limitation of this method was examined,and the results were verified by comparing the experimentally obtained beam current accumulation curves with the simulation *** confirms the accuracy and reliability of the proposed method for measuring the stripping foil thickness.

关键词： Stripping injection Foil thickness Synchrotron Injection efficiency Experimental study

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effects of Preionization Assembly Structural Parameters on Triggering Performance of Multigap Gas Switch Gaps

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IEEE Transactions on Plasma Science 2025年第4期53卷 729-738页

作者： Wen, Zhenming Wang, Zhiguo Jiang, Xiaofeng Fan, Siyuan Qiu, Aici Xi’an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi’an710049 China Northwest Institute of Nuclear Technology State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi’an710024 China

Developing a gas switch with low jitter is crucial for the linear transformer driver (LTD) bricks and modules to be triggered in the proper sequence. Preionization is an effective approach to enhance the triggering performance of gas switches. This article focuses on a disk-shaped preionization assembly (DPA) and analyzes the impact of variations in the DPA structural parameters (gap spacing d and disk height h) as well as the trigger pulse polarity on the triggering characteristics of multigap gas switch gaps. To, respectively, investigate the influence of preionization on the different types of switch gaps, a two-gap gas switch (TGGS) consisting of one trigger gap and one self-breakdown gap is adopted. The trigger experiments for the separate preionization gap and the TGGS equipped with the DPA are conducted. The experimental results demonstrate that the breakdown delay of the preionization gap with large d exhibits the polarity effect. The polarity effect of the breakdown delay and jitter of the trigger and self-breakdown gaps are opposite. The changes of d and h have reversed influence on the breakdown properties of the two types of switch gaps. Because the self-breakdown gap has greater breakdown delay and jitter than the trigger gap, the overall performance of the TGGS is primarily determined by the former. Employing a DPA with larger h and moderate d and adopting a negative trigger pulse could reduce the trigger delay and jitter of the switch. © 1973-2012 IEEE.

关键词： Structural optimization

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Study on discharge characteristic of surface-discharge optical pumping source on BN ceramic 7

Study on discharge characteristic of surface-discharge optic...

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7th International Symposium on Laser Interaction with Matter, LIMIS 2024

作者： Huang, Chao Yi, Aiping Zhu, Feng Li, Gaopeng Yan, Wenbo Wang, Yousheng National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an710024 China National Key Laboratory of Laser Interaction with Matter Northwest Institute of Nuclear Technology Xi'an710024 China

ISBN: (数字)9781510688865

ISBN: (纸本)9781510688858

In order to obtain strong vacuum ultraviolet radiation, a surface-discharge optical pump source on BN ceramics was developed. The discharge characteristics of the surface-discharge optical pump source were studied by using discharge voltage waveform and discharge current waveform, and the radiation spectra of the pump source were measured. The parameters such as discharge period, discharge current and so on are obtained, the equivalent inductance, resistance, energy deposition efficiency and plasma power density of the discharge channel are calculated, and the radiation brightness temperature of the pump source is analyzed. It is found that a higher efficiency and higher radiation temperature of BN ceramic surface discharge optical pump source is obtain by increasing charging voltage and working gas pressure. When the charging voltage is 26.8kV, the energy deposition efficiency of pump source is above 80% under the condition of working gas pressure 100kPa and discharge gap length of 8cm, the power density of discharge plasma reaches 8.61MW/ cm. Copyright © 2024 SPIE.

关键词： Optical pumping

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The design of the x-ray radiography with a rear illuminated backlighter for a nanosecond laser with dozens of joules 7

The design of the x-ray radiography with a rear illuminated ...

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7th International Symposium on Laser Interaction with Matter, LIMIS 2024

作者： Wang, Peng Liu, Yanpeng Wang, Hao Xue, Quanxi Wang, Yousheng Huang, Chao Li, GaoPeng Yan, Wenbo Yi, Aiping Ye, JingFeng Huang, Ke State Key Laboratory of Laser Interaction with Matter Xi'an710024 China National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi'an710024 China Northwest Institute of Nuclear Technology Xi'an710024 China

ISBN: (数字)9781510688865

ISBN: (纸本)9781510688858

High-power laser facility is becoming an important experimental platform for the study of micro-ejection phenomenon, and X-ray radiography is an important diagnostic technique in this experiment. Compared to the X-ray radiography driven by picosecond or femtosecond laser, the X-ray radiography driven by nanosecond laser can capture multiple images of different time in a single experiment, which is helpful for the evolution diagnosis in high energy density physics. However, this is difficult for a nanosecond laser with only a few dozen of joules of energy, requiring very sophisticated design. This paper introduces the design of high spatial resolution X-ray radiography based on a nanosecond laser with dozens of joules. Firstly, the numerical simulation work is introduced, including the analysis of laser driven micro-ejection experiments and the X-ray backlight characteristic of different types of backlighting target by using the radiation hydrodynamics code. Secondly, the design of the experimental target based on the physical analysis and the target chamber structure is presented. Copyright © 2024 SPIE.

关键词： X ray radiography

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Development of angular multiplexing MOPA system of high-power XeCl excimer laser experimental platform 7

Development of angular multiplexing MOPA system of high-powe...

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7th International Symposium on Laser Interaction with Matter, LIMIS 2024

作者： Xue, QuanXi Zhao, Xueqing Wang, Dahui Yi, Aiping Hu, Yun Zhang, Yongsheng Ma, Lianying Huang, Ke Huang, Chao Liu, Yanpeng Zhu, Yongxiang Wang, Yousheng Wang, Hao Yan, Wenbo Wang, Peng Li, Gaopeng Liu, Jingru National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Shaanxi Xi'an China State Key Laboratory of Laser Interaction with Matter Shaanxi Xi'an China Northwest Institute of Nuclear Technology Shaanxi Xi'an China

ISBN: (数字)9781510688865

ISBN: (纸本)9781510688858

High power excimer laser has significant technical advantages such as good irradiation uniformity on target surface, repeatable operation and high electro-optical efficiency. It has played an important role in the research fields of inertial confinement fusion, high energy density physics and plasma physics. In this paper, the development of angular multiplexing MOPA system of a high power XeCl excimer laser experimental platform is introduced, including system design, engineering design, system construction, platform performance test and so on. Through the development of the system, the performance index of the experimental platform is significantly improved, including the pulse width is compressed from 200ns to 28ns (adjustable), the focal spot on the target surface is compressed from mm level to 260800μm (adjustable), the power density is increased from 1011W/cm2 to 1013W/cm2, and the uniformity of single beam spot on the target surface reaches 5.2%, while the spot uniformity of 18 laser beams reaches 2.0%. Copyright © 2024 SPIE.

关键词： Inertial confinement fusion

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Application progress and prospect of 100-joule high-power XeCl excimer laser 7

Application progress and prospect of 100-joule high-power Xe...

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7th International Symposium on Laser Interaction with Matter, LIMIS 2024

作者： Xue, Quanxi Liu, Yanpeng Wang, Hao Wang, Peng Yi, Aiping Zhao, Xueqing Huang, Chao Wang, Yousheng Yan, Wenbo Li, Gaopeng Wang, Dahui Huang, Ke Liu, Jingru National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Shaanxi Xi'an China State Key Laboratory of Laser Interaction with Matter Shaanxi Xi'an China Northwest Institute of Nuclear Technology Shaanxi Xi'an China

ISBN: (数字)9781510688865

ISBN: (纸本)9781510688858

High power excimer laser has the characteristics of good irradiation uniformity on target surface, repeatable operation and high electro-optical efficiency. It has played an important role in the research fields of inertial confinement fusion, high energy density physics, plasma physics, and so on. In this paper, the high power XeCl excimer laser device in Northwest Institute of Nuclear Technology is briefly introduced. Secondly, the application progress of the device is introduced, which mainly includes the research work in laser-plasma interaction, high temperature explosion simulation, high pressure flying plate drive, solid material sound velocity measurement, X-ray framing camera performance assessment, multi-angle shock diagnosis target structure verification. Finally, the future application of the device is prospected. Copyright © 2024 SPIE.

关键词： Inertial confinement fusion

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Damage Behavior and Damage Mechanism of Dielectric Films Under Nanosecond pulsed Currents

Damage Behavior and Damage Mechanism of Dielectric Films Und...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Dong, Ziyi Sun, Jinru Chen, Zhiqiang Huo, Jingjing Yao, Xueling School of Electrical Engineering Xi’an Jiaotong University Xi’an710049 China The National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China

ISBN: (纸本)9789819620791

This paper focuses on the risk of flashover failure along the surface of dielectric films for peaking capacitors and investigates the damage behavior and damage mechanism of polyimide (PI), polypropylene (PP), and polyester (PET) films under the action of higher-amplitude nanosecond pulsed currents. Establishment of a nanosecond pulse current test platform to analyze the performance degradation and structural damage of dielectric films under repeated nanosecond pulse currents by means of flashover voltage monitoring, morphology observation, and chemical characterization. The degradation and damage mechanisms of dielectric film insulation were investigated by varying the flashover channel distance, gas environment, and gas pressure. The damage modes of thin film materials under the action of a flash arc include surface deformation, decreased flash resistance, molecular chain breakage and group detachment. As the number of discharges increased, the flashover withstand voltage of PI was maintained at a more stable value, the flashover voltage of PP showed a slight decrease, and the flashover voltage of PET showed a significant decreasing trend. Combining the differences in the initial along-surface withstand strengths of different films and the changes in flashover voltage under multiple discharges, combined with infrared spectroscopy testing and analysis, we provide experimental and theoretical support for the investigation and risk assessment of the insulation failure mechanism of dielectric films for peaked capacitors. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Flashover

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Research progress on underwater shock wave generation and diagnosis technology based on high-power laser 7

Research progress on underwater shock wave generation and di...

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7th International Symposium on Laser Interaction with Matter, LIMIS 2024

作者： Wang, Hao Xue, Quanxi Wang, Peng Liu, Yanpeng Gao, Chao Zhu, Yuanfu Li, Guohua Huang, Chao Ye, Jingfeng Huang, Ke National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an710024 China State Key Laboratory of Laser Interaction with Matter Northwest Institute of Nuclear Technology Xi'an710024 China

ISBN: (数字)9781510688865

ISBN: (纸本)9781510688858

The study of underwater shock waves based on high-power laser is of great significance for understanding the interaction laws between lasers and matter in liquid environments, and it shows broad application potential in fields such as underwater detection and communication, and hydraulic mechanical design. By solving the problems of underwater environment construction and effective deposition of laser energy, this paper develops a target that can produce an underwater shock wave similar to that of point explosion based on numerical simulation. In addition, the established schlieren diagnostic system with the capability to adjust the diagnostic moment arbitrarily, can acquire four underwater shock wave evolution images in a single shot experiment, and as well as the wavefront travel time and pressure of shock wave. The research shall provide technical support for revealing the evolution laws of underwater shock waves. Copyright © 2024 SPIE.

关键词： Shock waves

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