Pub Date : 2021-06-15DOI: 10.11884/HPLPB202133.210190
Li Yuan, Wen Jia-Ye, Li Lin-bo, Gao Jing, Shi Yaxuan, Liu Zhihao, Zhang Guan-jun
The studies on discharges in liquid dielectrics have been continuously gaining great attentions in the field of high voltage and insulation engineering. Profound understandings of the characteristics and mechanism of micro/nano-second pulsed discharge in liquids are prerequisites to the innovation and breakthrough of various cutting-edge applications, e.g., optimized electrical equipment design, deep ocean explorations, advanced material synthesis. In this review, we summarize the recent progress in the investigations of characteristics and mechanisms of micro/nano-second pulsed streamer discharge in liquid dielectrics. Fundamental characteristics of streamer discharge are elucidated including discharge modes and transition, branching characteristic, and breakdown. The contributing factors on the streamer characteristics, such as liquid conductivity, pressure, dissolved gas, impurities and additives, are analyzed. Prevailing mechanisms of initiation and propagation of streamer discharge in liquids as well as their application scenarios are discussed, including bubble theory, direct impact ionization, field molecular ionization, electrostriction, etc. Further, we expect the prospects and challenges of liquid discharge to enlighten fundamental researches and engineering applications in the relevant fields.
{"title":"Characteristics and mechanisms of streamer discharge in liquids under micro/nano-second pulsed voltages: status and advances","authors":"Li Yuan, Wen Jia-Ye, Li Lin-bo, Gao Jing, Shi Yaxuan, Liu Zhihao, Zhang Guan-jun","doi":"10.11884/HPLPB202133.210190","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210190","url":null,"abstract":"The studies on discharges in liquid dielectrics have been continuously gaining great attentions in the field of high voltage and insulation engineering. Profound understandings of the characteristics and mechanism of micro/nano-second pulsed discharge in liquids are prerequisites to the innovation and breakthrough of various cutting-edge applications, e.g., optimized electrical equipment design, deep ocean explorations, advanced material synthesis. In this review, we summarize the recent progress in the investigations of characteristics and mechanisms of micro/nano-second pulsed streamer discharge in liquid dielectrics. Fundamental characteristics of streamer discharge are elucidated including discharge modes and transition, branching characteristic, and breakdown. The contributing factors on the streamer characteristics, such as liquid conductivity, pressure, dissolved gas, impurities and additives, are analyzed. Prevailing mechanisms of initiation and propagation of streamer discharge in liquids as well as their application scenarios are discussed, including bubble theory, direct impact ionization, field molecular ionization, electrostriction, etc. Further, we expect the prospects and challenges of liquid discharge to enlighten fundamental researches and engineering applications in the relevant fields.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46844349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-15DOI: 10.11884/HPLPB202133.210020
Liu Yawei, Zhou Zikai, Wang Sen, Fang Zhi
In this paper, a nanosecond pulse power supply is employed to excite the gas-liquid discharge in atmospheric air, and the discharge characteristics, plasma characteristics and the composition of activated water under different pulse parameters are studied. The results show that the discharge consists of three stages in one pulse period, among which the two discharges that occur during the pulse duration and the falling edge are stronger, and the discharge on the rising edge is weaker. When the pulse voltage increases, the discharge current, average power, luminous intensity and spectra intensity all gradually increase. When the frequency increases, the discharge current is almost unchanged, but the power increases significantly, the discharge luminous and spectra intensity also increase. The increase of the voltage rising edge time will weaken the discharge intensity, and the corresponding luminous intensity and spectra intensity will be weakened. The increase of the voltage falling edge enhances the discharge, and the luminous intensity and emission spectra intensity increase. When the pulse voltage, frequency and falling edge time increase, the concentration of H2O2, begin{document}${rm{NO}}_2^ - $end{document} and begin{document}${rm{NO}}_3^ - $end{document} gradually increases. The increase of the rising edge time results in the decrease of the three active species concentrations. These results are helpful to understand the mechanisms of gas-liquid discharge characteristics under different conditions, so as to control plasma and solution activity, which will promote further practical application of nanosecond pulse gas-liquid discharge.
In this paper, a nanosecond pulse power supply is employed to excite the gas-liquid discharge in atmospheric air, and the discharge characteristics, plasma characteristics and the composition of activated water under different pulse parameters are studied. The results show that the discharge consists of three stages in one pulse period, among which the two discharges that occur during the pulse duration and the falling edge are stronger, and the discharge on the rising edge is weaker. When the pulse voltage increases, the discharge current, average power, luminous intensity and spectra intensity all gradually increase. When the frequency increases, the discharge current is almost unchanged, but the power increases significantly, the discharge luminous and spectra intensity also increase. The increase of the voltage rising edge time will weaken the discharge intensity, and the corresponding luminous intensity and spectra intensity will be weakened. The increase of the voltage falling edge enhances the discharge, and the luminous intensity and emission spectra intensity increase. When the pulse voltage, frequency and falling edge time increase, the concentration of H2O2, begin{document}${rm{NO}}_2^ - $end{document} and begin{document}${rm{NO}}_3^ - $end{document} gradually increases. The increase of the rising edge time results in the decrease of the three active species concentrations. These results are helpful to understand the mechanisms of gas-liquid discharge characteristics under different conditions, so as to control plasma and solution activity, which will promote further practical application of nanosecond pulse gas-liquid discharge.
{"title":"Research on the characteristics of atmospheric pressure air pulse gas-liquid discharge using a needle-water electrode","authors":"Liu Yawei, Zhou Zikai, Wang Sen, Fang Zhi","doi":"10.11884/HPLPB202133.210020","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210020","url":null,"abstract":"In this paper, a nanosecond pulse power supply is employed to excite the gas-liquid discharge in atmospheric air, and the discharge characteristics, plasma characteristics and the composition of activated water under different pulse parameters are studied. The results show that the discharge consists of three stages in one pulse period, among which the two discharges that occur during the pulse duration and the falling edge are stronger, and the discharge on the rising edge is weaker. When the pulse voltage increases, the discharge current, average power, luminous intensity and spectra intensity all gradually increase. When the frequency increases, the discharge current is almost unchanged, but the power increases significantly, the discharge luminous and spectra intensity also increase. The increase of the voltage rising edge time will weaken the discharge intensity, and the corresponding luminous intensity and spectra intensity will be weakened. The increase of the voltage falling edge enhances the discharge, and the luminous intensity and emission spectra intensity increase. When the pulse voltage, frequency and falling edge time increase, the concentration of H2O2, begin{document}${rm{NO}}_2^ - $end{document} and begin{document}${rm{NO}}_3^ - $end{document} gradually increases. The increase of the rising edge time results in the decrease of the three active species concentrations. These results are helpful to understand the mechanisms of gas-liquid discharge characteristics under different conditions, so as to control plasma and solution activity, which will promote further practical application of nanosecond pulse gas-liquid discharge.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42077055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-15DOI: 10.11884/HPLPB202133.210102
Kang Yuchan, Yan Jiyuan, Peng Chengkai, Song Yanze, Ma Guoshuang, Zhang Yahui, Lu Tianshu, Xie Qing
The modification effect of plasma on the material will be weakened with the storage time, that is, it shows a certain timeliness, which limits further development of plasma modification technology. To explore ageing behavior of plasma dielectric barrier discharge (DBD) fluorinated epoxy resin, the surface fluorination of epoxy resin was realized by plasma dielectric barrier discharge. Scanning electron microscopy (SEM), surface profilometer, X-ray photoelectron spectroscopy (XPS), contact angle tester, high resistance meter, flashover voltage and surface potential testing system were used to characterize the physical morphology, chemical composition and electrical properties of epoxy resin surface before modification as well as being placed in 25 ℃ aging box for 0−30 d after modification. The experimental results show that fluoride grafting on the surface of epoxy resin is realized by DBD fluorination modification, which reduces the surface energy, surface resistivity and trap level of epoxy resin, thus speeds up the surface potential decay rate and increases the flashover voltage along the surface. After storage of 30 d, the fluorine content decreased, the surface energy increased, the attenuation rate of surface potential slowed down slightly, and the flashover voltage also decreased, but it is still higher than that of the untreated sample.
{"title":"Plasma dielectric barrier discharge fluorination modified epoxy resin and its ageing behavior","authors":"Kang Yuchan, Yan Jiyuan, Peng Chengkai, Song Yanze, Ma Guoshuang, Zhang Yahui, Lu Tianshu, Xie Qing","doi":"10.11884/HPLPB202133.210102","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210102","url":null,"abstract":"The modification effect of plasma on the material will be weakened with the storage time, that is, it shows a certain timeliness, which limits further development of plasma modification technology. To explore ageing behavior of plasma dielectric barrier discharge (DBD) fluorinated epoxy resin, the surface fluorination of epoxy resin was realized by plasma dielectric barrier discharge. Scanning electron microscopy (SEM), surface profilometer, X-ray photoelectron spectroscopy (XPS), contact angle tester, high resistance meter, flashover voltage and surface potential testing system were used to characterize the physical morphology, chemical composition and electrical properties of epoxy resin surface before modification as well as being placed in 25 ℃ aging box for 0−30 d after modification. The experimental results show that fluoride grafting on the surface of epoxy resin is realized by DBD fluorination modification, which reduces the surface energy, surface resistivity and trap level of epoxy resin, thus speeds up the surface potential decay rate and increases the flashover voltage along the surface. After storage of 30 d, the fluorine content decreased, the surface energy increased, the attenuation rate of surface potential slowed down slightly, and the flashover voltage also decreased, but it is still higher than that of the untreated sample.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47107790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-15DOI: 10.11884/HPLPB202133.210118
Cheng Yue, Yu Zhe, Li Jinmao, Song Chunlian, Zhao Zhihao, Lu Dandan, Zhang Xiaofang
High purity graphite with purity above 99.9%, as an industrial raw material, plays an important role in the high-tech field. The existing physical and chemical methods of graphite purification technology has high cost serious damage to equipment and environment by acid and alkali, and complex processes. Thus the development of an excellent and effective graphite purification technology has become a research hotspot in recent years at home and abroad. A purification method of flaky graphite by arc plasma is established in this paper. The characteristics of high temperature which can be produced quickly by using arc plasma is used to treat the flaky graphite samples with a purity of 94.18% from Jixi City of Heilongjiang Province, under high temperature. The results show that the optimal discharge parameters are air flow rate 25 L/min, current 400 A and power 10 kW. At this point, the surface temperature of the arc plasma is up to 3350 ℃. Scanning electron microscope is used to compare the microstructure of graphite samples before and after arc processing to find the characteristics of shredding and breaking of graphite samples. The graphite purity and impurities are analysed according to national standard chemical analysis method of GB/T 3521 2008. After arc treatment, the purity of graphite is increased to 99.21%.
{"title":"Study on purification of flaky graphite by argon arc plasma torch","authors":"Cheng Yue, Yu Zhe, Li Jinmao, Song Chunlian, Zhao Zhihao, Lu Dandan, Zhang Xiaofang","doi":"10.11884/HPLPB202133.210118","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210118","url":null,"abstract":"High purity graphite with purity above 99.9%, as an industrial raw material, plays an important role in the high-tech field. The existing physical and chemical methods of graphite purification technology has high cost serious damage to equipment and environment by acid and alkali, and complex processes. Thus the development of an excellent and effective graphite purification technology has become a research hotspot in recent years at home and abroad. A purification method of flaky graphite by arc plasma is established in this paper. The characteristics of high temperature which can be produced quickly by using arc plasma is used to treat the flaky graphite samples with a purity of 94.18% from Jixi City of Heilongjiang Province, under high temperature. The results show that the optimal discharge parameters are air flow rate 25 L/min, current 400 A and power 10 kW. At this point, the surface temperature of the arc plasma is up to 3350 ℃. Scanning electron microscope is used to compare the microstructure of graphite samples before and after arc processing to find the characteristics of shredding and breaking of graphite samples. The graphite purity and impurities are analysed according to national standard chemical analysis method of GB/T 3521 2008. After arc treatment, the purity of graphite is increased to 99.21%.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45630757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-15DOI: 10.11884/HPLPB202133.210103
Han Ruo-Yu, Deng Chengzhi, F. Juan, Li Chen, Yao Weibo, Ouyang Ji-ting
Electrical explosion of wires (EEW) driven by pulse current can produce plasmas with high energy density, and is accompanied by electromagnetic pulses, strong shock waves, etc., therefore it is widely adopted in Z-pinch, electrothermal chemical weapons, oil and gas exploitation and other fields. Compared to pure metal, alloy has characteristics of the high resistivity, adjustable composition, and complex phase transitions. It has great potential in regulating parameters of EEW. This paper presents an experimental study on exploding Cu, Ni, and Cu-Ni alloy (constantan) wires in atmospheric air under a microsecond time-scale pulsed current. Through the diagnoses of electrical parameters and self-emission images, the discharge characteristics and spatial-temporal evolution of explosion products were obtained. Features of the alloy wire explosion in phase transition and plasma were acquired as well. Experiments revealed that in the early stage of EEW, the high resistivity of the alloy could improve the energy deposition efficiency, namely 52% for Cu, 74% for Ni, and 78% for Cu-Ni, while after the explosion, performance of the alloy wire was closer to that of the Ni wire. The initial expansion rate of the plasma channel reached 5 mm/μs level but then decayed. The expansion process of alloy wire endured longer, and the average resistivity went up slowly after the breakdown. Also, a correlation was found between plasma radiation and metal aerosol in spatial scale. Especially, the alloy aerosol has crossed striation features (10−1 mm), but it is more uniform than Cu aerosol generally.
{"title":"Discharge characteristics and spatial-temporal evolution of Cu-Ni alloy wire explosion","authors":"Han Ruo-Yu, Deng Chengzhi, F. Juan, Li Chen, Yao Weibo, Ouyang Ji-ting","doi":"10.11884/HPLPB202133.210103","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210103","url":null,"abstract":"Electrical explosion of wires (EEW) driven by pulse current can produce plasmas with high energy density, and is accompanied by electromagnetic pulses, strong shock waves, etc., therefore it is widely adopted in Z-pinch, electrothermal chemical weapons, oil and gas exploitation and other fields. Compared to pure metal, alloy has characteristics of the high resistivity, adjustable composition, and complex phase transitions. It has great potential in regulating parameters of EEW. This paper presents an experimental study on exploding Cu, Ni, and Cu-Ni alloy (constantan) wires in atmospheric air under a microsecond time-scale pulsed current. Through the diagnoses of electrical parameters and self-emission images, the discharge characteristics and spatial-temporal evolution of explosion products were obtained. Features of the alloy wire explosion in phase transition and plasma were acquired as well. Experiments revealed that in the early stage of EEW, the high resistivity of the alloy could improve the energy deposition efficiency, namely 52% for Cu, 74% for Ni, and 78% for Cu-Ni, while after the explosion, performance of the alloy wire was closer to that of the Ni wire. The initial expansion rate of the plasma channel reached 5 mm/μs level but then decayed. The expansion process of alloy wire endured longer, and the average resistivity went up slowly after the breakdown. Also, a correlation was found between plasma radiation and metal aerosol in spatial scale. Especially, the alloy aerosol has crossed striation features (10−1 mm), but it is more uniform than Cu aerosol generally.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42110068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-15DOI: 10.11884/HPLPB202133.210114
Zhu Longyu, Yang Junxiang, Sugai Taichi, Jiang Weihua
An all-solid-state LC-Marx generator based on magnetic switch has been proposed and analyzed by theory, simulation and experiment. This system is controlled by 1 MOSFET and magnetic switches that are made by 1 magnetic core. It has dimensions of 130 mm (diameter) and 60 mm (height), which almost not change with the stage increase. The capacitors could be charged to 1.82 times source voltage according to the principle of resonant charging. Five-stage LC-Marx generator could obtain a peak output voltage of −10.9 kV with rise time of 80 ns when the source voltage of 950 V is applied, and the energy efficiency is 30.43% on 500 Ω. The generator has been tested under 30 kHz that could work steadily. It could output higher voltage when used for atmospheric discharge.
{"title":"Compact all-solid-state high frequency LC-Marx generator based on magnetic switch","authors":"Zhu Longyu, Yang Junxiang, Sugai Taichi, Jiang Weihua","doi":"10.11884/HPLPB202133.210114","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210114","url":null,"abstract":"An all-solid-state LC-Marx generator based on magnetic switch has been proposed and analyzed by theory, simulation and experiment. This system is controlled by 1 MOSFET and magnetic switches that are made by 1 magnetic core. It has dimensions of 130 mm (diameter) and 60 mm (height), which almost not change with the stage increase. The capacitors could be charged to 1.82 times source voltage according to the principle of resonant charging. Five-stage LC-Marx generator could obtain a peak output voltage of −10.9 kV with rise time of 80 ns when the source voltage of 950 V is applied, and the energy efficiency is 30.43% on 500 Ω. The generator has been tested under 30 kHz that could work steadily. It could output higher voltage when used for atmospheric discharge.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43302807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.210046
Yang Jing, Du Yaoyao, Wang Lin, Ye Qiang, Ma Hui-Zhou, Wei Shujun, Yue Jun-hui, Sui Yan-feng, Gao Guodong, Tang Xuhui, Cao Jian-she
Aiming to control the rising failure rate of electronics system for BEPC II linac’s beam position measurement, considering the physical design parameters of BEPC II and the requirements of band-pass sampling of BPM electronics ADC chip, a digital BPM RF front-end electronics with high isolation degree and good amplitude and phase consistency is designed. The digital BPM electronics system adopts MicroTCA 4.0 system architecture, takes FPGA as the main controller, and is designed based on EDA software. This paper mainly introduces RF power amplifier, digital adjustable attenuator and bandpass filter in RF front-end electronics module, as well as the laboratory and online test results. In the collision mode of BEPC II, positron beam was used to complete the electronic system online test, and the measurement accuracy of x-direction was about 38.46 μm, while that of y-direction was about 26.16 μm. The measurement accuracy and system stability of the proposed method are better than that of commercial analog BPM electronics module, and can meet the beam position measurement requirements of BEPC II linac.
{"title":"Development of digital BPM front-end conditioning circuit for BEPCII linac","authors":"Yang Jing, Du Yaoyao, Wang Lin, Ye Qiang, Ma Hui-Zhou, Wei Shujun, Yue Jun-hui, Sui Yan-feng, Gao Guodong, Tang Xuhui, Cao Jian-she","doi":"10.11884/HPLPB202133.210046","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210046","url":null,"abstract":"Aiming to control the rising failure rate of electronics system for BEPC II linac’s beam position measurement, considering the physical design parameters of BEPC II and the requirements of band-pass sampling of BPM electronics ADC chip, a digital BPM RF front-end electronics with high isolation degree and good amplitude and phase consistency is designed. The digital BPM electronics system adopts MicroTCA 4.0 system architecture, takes FPGA as the main controller, and is designed based on EDA software. This paper mainly introduces RF power amplifier, digital adjustable attenuator and bandpass filter in RF front-end electronics module, as well as the laboratory and online test results. In the collision mode of BEPC II, positron beam was used to complete the electronic system online test, and the measurement accuracy of x-direction was about 38.46 μm, while that of y-direction was about 26.16 μm. The measurement accuracy and system stability of the proposed method are better than that of commercial analog BPM electronics module, and can meet the beam position measurement requirements of BEPC II linac.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46037309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.200293
Lin Zewen, W. Zhenzhong, Huang Xuepeng, Kong Liuwei
Precision polishing system for opticals based on bonnet polishing technology and industrial robot can not only meet the requirements of high efficiency and precision of rapid polishing, but also reduce the development cost, thus it is a potential development solution for polishing. Bonnet polishing requires stable and deterministic material removal characteristics, and the stability of polishing spot is usually around 90%. The influence of robot stiffness on the stability of robot bonnet polishing system in the process of multi-step discrete precession polishing was studied. The robot end deformation was analyzed by the stiffness matrix, and the removal function of bonnet polishing with deformation error was established based on Preston theory. Finally, a four-step discrete polishing experiment was designed. According to the results, the polishing spot was Gaussian on the xy section contour line, and the xy section contour line was basically the same, with a good coincidence degree. Comparison of the cross-section profiles at different polishing positions indicates, the relative errors are below 5%. The experiment proves that the robot bonnet polishing system has a good stability in discrete precast polishing.
{"title":"Influence of robotic structural deformation on bonnet polishing removal function","authors":"Lin Zewen, W. Zhenzhong, Huang Xuepeng, Kong Liuwei","doi":"10.11884/HPLPB202133.200293","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200293","url":null,"abstract":"Precision polishing system for opticals based on bonnet polishing technology and industrial robot can not only meet the requirements of high efficiency and precision of rapid polishing, but also reduce the development cost, thus it is a potential development solution for polishing. Bonnet polishing requires stable and deterministic material removal characteristics, and the stability of polishing spot is usually around 90%. The influence of robot stiffness on the stability of robot bonnet polishing system in the process of multi-step discrete precession polishing was studied. The robot end deformation was analyzed by the stiffness matrix, and the removal function of bonnet polishing with deformation error was established based on Preston theory. Finally, a four-step discrete polishing experiment was designed. According to the results, the polishing spot was Gaussian on the xy section contour line, and the xy section contour line was basically the same, with a good coincidence degree. Comparison of the cross-section profiles at different polishing positions indicates, the relative errors are below 5%. The experiment proves that the robot bonnet polishing system has a good stability in discrete precast polishing.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42500944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.200350
Sun Jiangning, Pan Xiaodong, L. Xinfu, Wan Haojiang, Wei Guanghui
Aiming at the problem that the impedance of the probe is prone to non-linear changes when applied to the bulk current injection test replacing high field intensity radiation, the linearity test of the existing commercial current probe is carried out by analyzing the method of large current injection. The test results show that as the injected power increases, the linearity error at different frequencies also increases. A plan for the development of a high-power and high-linearity current probe was proposed, and the probe was developed and passed the test. The self-developed current injection probe has a maximum withstand power of 500 W. The insertion loss varies with the injected power and has good linearity (0.3 dB @ 1−500 W). The probe can meet the technical requirements of carrying out bulk current injection (equivalent high field electromagnetic radiation effect) test.
针对大电流注入替代高场强辐射进行大电流注入测试时探头阻抗容易发生非线性变化的问题，通过分析大电流注入方法，对现有商用电流探头进行线性度测试。测试结果表明，随着注入功率的增大，不同频率下的线性误差也随之增大。提出了大功率、高线性电流探头的研制方案，研制成功并通过了试验。自主研发的电流注入探头最大承受功率为500w。插入损耗随注入功率变化，线性度好(0.3 dB @ 1 ~ 500 W)，满足进行大电流注入(等效高场电磁辐射效应)测试的技术要求。
{"title":"Performance analysis and development of high-power and high-linearity current injection probes","authors":"Sun Jiangning, Pan Xiaodong, L. Xinfu, Wan Haojiang, Wei Guanghui","doi":"10.11884/HPLPB202133.200350","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200350","url":null,"abstract":"Aiming at the problem that the impedance of the probe is prone to non-linear changes when applied to the bulk current injection test replacing high field intensity radiation, the linearity test of the existing commercial current probe is carried out by analyzing the method of large current injection. The test results show that as the injected power increases, the linearity error at different frequencies also increases. A plan for the development of a high-power and high-linearity current probe was proposed, and the probe was developed and passed the test. The self-developed current injection probe has a maximum withstand power of 500 W. The insertion loss varies with the injected power and has good linearity (0.3 dB @ 1−500 W). The probe can meet the technical requirements of carrying out bulk current injection (equivalent high field electromagnetic radiation effect) test.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42746000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.210006
Li Yudong, Wang Yuhe, Z. Yuqin, Han Shiwei, Yu Yang, Q. Xuan, Lu Nannan, Bai Zhenxu, Wang Yu-Lei, L. Zhi-Wei
Stimulated Brillouin scattering (SBS) as a third-order optical effect is widely used in laser beam combination, distributed fiber sensing, Brillouin lasers and other fields. In recent years, SBS pulse compression has also received special attention. Based on the energy transfer characteristics of the Brillouin amplification process, SBS pulse compression technology can compress nanosecond pulses to sub-nanosecond levels, and the peak power can be increased by 1-2 orders of magnitude. This paper systematically introduces the basic theory of SBS pulse compression, comprehensively discusses the influence of SBS compressor structure, gain medium, pump pulse and other factors on pulse compression characteristics, and looks forward to the development trends of SBS pulse compression. It provides a useful reference for the future study of SBS characteristics and a feasible scheme for the acquisition of high repetition frequency and high energy laser.
{"title":"Research progress of stimulated Brillouin scattering pulse compression technique","authors":"Li Yudong, Wang Yuhe, Z. Yuqin, Han Shiwei, Yu Yang, Q. Xuan, Lu Nannan, Bai Zhenxu, Wang Yu-Lei, L. Zhi-Wei","doi":"10.11884/HPLPB202133.210006","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210006","url":null,"abstract":"Stimulated Brillouin scattering (SBS) as a third-order optical effect is widely used in laser beam combination, distributed fiber sensing, Brillouin lasers and other fields. In recent years, SBS pulse compression has also received special attention. Based on the energy transfer characteristics of the Brillouin amplification process, SBS pulse compression technology can compress nanosecond pulses to sub-nanosecond levels, and the peak power can be increased by 1-2 orders of magnitude. This paper systematically introduces the basic theory of SBS pulse compression, comprehensively discusses the influence of SBS compressor structure, gain medium, pump pulse and other factors on pulse compression characteristics, and looks forward to the development trends of SBS pulse compression. It provides a useful reference for the future study of SBS characteristics and a feasible scheme for the acquisition of high repetition frequency and high energy laser.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43271234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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