Pub Date : 2020-09-13DOI: 10.11884/HPLPB202032.200109
Hu Xin, Li Jin, Liu Shenye, Zhang Kunlin, Li Yukun, Wang Feng, Yang Jia-min, Ding Yong-kun, Jiang Shao－en, Zhang Xing
The streak cameras have very important applications in Inertial Confinement Fusion (ICF), including x-ray streak cameras and optical streak cameras. At present, they are still the core diagnostic devices with the highest temporal resolution in this field. This paper introduces the performance and characteristics of two main types of the streak cameras widely used in the field of laser fusion both domestic and international. They are equipped with coaxial electrode double-focus electron optics streak tube and bilamellar electron optics streak tube respectively. In terms of specifications of streak camera, the criteria of dynamic range of streak camera are emphasized, the dynamic range data of today's international high performance streak cameras are presented. The paper also introduces several important research progresses in the development of streak camera technologies, including advanced backlighting ultraviolet fiducial system, neutron radiation tolerant device and gated cathode technology.
{"title":"State of the art and future prospective of high performance streak cameras for laser fusion","authors":"Hu Xin, Li Jin, Liu Shenye, Zhang Kunlin, Li Yukun, Wang Feng, Yang Jia-min, Ding Yong-kun, Jiang Shao－en, Zhang Xing","doi":"10.11884/HPLPB202032.200109","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200109","url":null,"abstract":"The streak cameras have very important applications in Inertial Confinement Fusion (ICF), including x-ray streak cameras and optical streak cameras. At present, they are still the core diagnostic devices with the highest temporal resolution in this field. This paper introduces the performance and characteristics of two main types of the streak cameras widely used in the field of laser fusion both domestic and international. They are equipped with coaxial electrode double-focus electron optics streak tube and bilamellar electron optics streak tube respectively. In terms of specifications of streak camera, the criteria of dynamic range of streak camera are emphasized, the dynamic range data of today's international high performance streak cameras are presented. The paper also introduces several important research progresses in the development of streak camera technologies, including advanced backlighting ultraviolet fiducial system, neutron radiation tolerant device and gated cathode technology.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"112005-1-112005-10"},"PeriodicalIF":0.0,"publicationDate":"2020-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42019236","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 : 2020-09-01DOI: 10.11884/HPLPB202032.200123
Zhong Jia-yong, A. Wei-ming, Ping Yong-Li, H. Bo, T. Pengfei, Yu Xiao-xia, Sun Wei, Xing Chunqing, Zhang Qian, Wang Jianzhao, Gao Weijia, Yu Jia-cheng, Li Zhengdong, Yue Shufeng
Laboratory astrophysics came into being with the advent of modern high-energy density physics research devices that can be used to create extreme physical conditions in the laboratory similar to those of certain celestial bodies or their surroundings, such as high-power lasers or pinch devices to generate extreme astrophysical plasma conditions. Such experimental conditions are unprecedented and correspond directly to many important and critical physical phenomena in astrophysics. They enable people to study the problems with astrophysical background in the laboratory in a close, active and controllable way. This paper introduces the latest progress in this field in recent years, and presents perspectives on future research directions.
{"title":"Introduction of laboratory astrophysics with intense lasers","authors":"Zhong Jia-yong, A. Wei-ming, Ping Yong-Li, H. Bo, T. Pengfei, Yu Xiao-xia, Sun Wei, Xing Chunqing, Zhang Qian, Wang Jianzhao, Gao Weijia, Yu Jia-cheng, Li Zhengdong, Yue Shufeng","doi":"10.11884/HPLPB202032.200123","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200123","url":null,"abstract":"Laboratory astrophysics came into being with the advent of modern high-energy density physics research devices that can be used to create extreme physical conditions in the laboratory similar to those of certain celestial bodies or their surroundings, such as high-power lasers or pinch devices to generate extreme astrophysical plasma conditions. Such experimental conditions are unprecedented and correspond directly to many important and critical physical phenomena in astrophysics. They enable people to study the problems with astrophysical background in the laboratory in a close, active and controllable way. This paper introduces the latest progress in this field in recent years, and presents perspectives on future research directions.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"092003-1-092003-21"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44781368","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 : 2020-08-15DOI: 10.11884/HPLPB202032.200134
Cai Hong-bo, Zhang Wenshuai, D. Bao, Yan Xinxin, Shan Lian-Qiang, Haoming Liang, Li Zhi-chao, Zhang Feng, Gong Tao, Yang Dong, Zou Shiyang, Zhu Shao-ping, He Xian-tu
In the study of inertial confinement fusion physics, the characteristics, temporal and spatial evolution of kinetic effects at the plasma interfaces attract crucial interest recently because they can affect the laser energy deposition, laser plasma instabilities, radiation asymmetry and implosion performance. A successful design of inertial confinement fusion requires the accurate description of the temporal and spatial evolution of the kinetic effects at the plasma interfaces, which is also a very challenging and unresolved problem in high energy density physics. In this paper, we will review our recent researches on the kinetic effects and their influence on laser plasma instabilities and implosion performance: (1) Electrostatic field arisen in the hohlraum wall/ablator (or the low-density fill-gas) interpenetration region will result in efficient acceleration of high energy ions, which is a source of the low-mode asymmetry of the implosion capsule. (2) The mechanism for the electrostatic field generation and the anomalous mix in the interpenetration layer at the high-Z and low-Z plasma interface and its effects on the laser plasma instabilities. (3) Reconstruction of the spontaneous electric and magnetic fields through proton radiography.
{"title":"Characteristic and impact of kinetic effects at interfaces of inertial confinement fusion hohlraums","authors":"Cai Hong-bo, Zhang Wenshuai, D. Bao, Yan Xinxin, Shan Lian-Qiang, Haoming Liang, Li Zhi-chao, Zhang Feng, Gong Tao, Yang Dong, Zou Shiyang, Zhu Shao-ping, He Xian-tu","doi":"10.11884/HPLPB202032.200134","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200134","url":null,"abstract":"In the study of inertial confinement fusion physics, the characteristics, temporal and spatial evolution of kinetic effects at the plasma interfaces attract crucial interest recently because they can affect the laser energy deposition, laser plasma instabilities, radiation asymmetry and implosion performance. A successful design of inertial confinement fusion requires the accurate description of the temporal and spatial evolution of the kinetic effects at the plasma interfaces, which is also a very challenging and unresolved problem in high energy density physics. In this paper, we will review our recent researches on the kinetic effects and their influence on laser plasma instabilities and implosion performance: (1) Electrostatic field arisen in the hohlraum wall/ablator (or the low-density fill-gas) interpenetration region will result in efficient acceleration of high energy ions, which is a source of the low-mode asymmetry of the implosion capsule. (2) The mechanism for the electrostatic field generation and the anomalous mix in the interpenetration layer at the high-Z and low-Z plasma interface and its effects on the laser plasma instabilities. (3) Reconstruction of the spontaneous electric and magnetic fields through proton radiography.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"092007-1-092007-11"},"PeriodicalIF":0.0,"publicationDate":"2020-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41949208","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 : 2020-08-15DOI: 10.11884/HPLPB202032.200130
Li Zhi-chao, Z. Hang, Gong Tao, Liqiang Xin, Yang Dong, Jiang Xiaohua, Zheng Jian, Liu Yong-Gang, Liu Yaoyuan, Chen Chaoxin, Li Sanwei, Li Qi, Pan Kaiqiang, G. Liang, Liang Yulong, Xu Tao, Peng Xiaoshi, Wu Changshu, Z. Huasen, Hao Liang, Lan Ke, Chen Yao-Hua, Zheng Chun-yang, Gu Peijun, Wang Feng, Cai Hongbo, Zheng Wudi, Zou Shiyang, Yang Jia-min, Jiang Shao－en, Zhang Bao-Han, Zhu Shao-ping, Ding Yong-kun
Currently, laboratory created energy density of laser-driven inertial confinement fusion (ICF) is extremely close to that for ignition, while the divergence between experiment and simulation is increasing. One of the key issues is the lack of advanced knowledge of laser-hohlraum coupling process, which has shown the complexity of hohlraum environment. Optical Thomson scattering (OTS) becomes the standard technique for diagnosing the ICF hohlraum plasma parameters, due to its capability of providing unperturbed, local and precise measurement. The development of OTS in China is closely related with the Shenguang series laser facilities, on which most of the ICF experiments are carried out. In recent years, 4ω(263 nm) Thomson scattering technique has been set up on Shenguang-III prototype and 100 kJ-level laser facility, the corresponding results help the understanding of ICF physics. In the near future, several novel methods will be developed, for high-precision diagnostics of ICF ignition hohlraum plasmas and the research of new physical phenomena.
{"title":"Recent research progress of optical Thomson scattering in laser-driven inertial confinement fusion","authors":"Li Zhi-chao, Z. Hang, Gong Tao, Liqiang Xin, Yang Dong, Jiang Xiaohua, Zheng Jian, Liu Yong-Gang, Liu Yaoyuan, Chen Chaoxin, Li Sanwei, Li Qi, Pan Kaiqiang, G. Liang, Liang Yulong, Xu Tao, Peng Xiaoshi, Wu Changshu, Z. Huasen, Hao Liang, Lan Ke, Chen Yao-Hua, Zheng Chun-yang, Gu Peijun, Wang Feng, Cai Hongbo, Zheng Wudi, Zou Shiyang, Yang Jia-min, Jiang Shao－en, Zhang Bao-Han, Zhu Shao-ping, Ding Yong-kun","doi":"10.11884/HPLPB202032.200130","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200130","url":null,"abstract":"Currently, laboratory created energy density of laser-driven inertial confinement fusion (ICF) is extremely close to that for ignition, while the divergence between experiment and simulation is increasing. One of the key issues is the lack of advanced knowledge of laser-hohlraum coupling process, which has shown the complexity of hohlraum environment. Optical Thomson scattering (OTS) becomes the standard technique for diagnosing the ICF hohlraum plasma parameters, due to its capability of providing unperturbed, local and precise measurement. The development of OTS in China is closely related with the Shenguang series laser facilities, on which most of the ICF experiments are carried out. In recent years, 4ω(263 nm) Thomson scattering technique has been set up on Shenguang-III prototype and 100 kJ-level laser facility, the corresponding results help the understanding of ICF physics. In the near future, several novel methods will be developed, for high-precision diagnostics of ICF ignition hohlraum plasmas and the research of new physical phenomena.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"092004-1-092004-14"},"PeriodicalIF":0.0,"publicationDate":"2020-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47557794","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 : 2020-08-13DOI: 10.11884/HPLPB202032.200080
Ren Tianqi, Tang Leilei, Zhou Zeran
The performance of Hefei Light Source II (HLS-II) has improved a lot after major maintenance and reconstruction. To further provide continuous and stable light, the RF system of the HLS-II LINAC needs to be upgraded for top-off mode. It is required that the RF power source have long-time stability and reliability, but the old analog low level RF system(LLRF) can’t meet the requirement. Hence a digital low level RF control system based on Micro Telecom Computing Architecture(MTCA) is designed and implemented to control the amplitude and phase of the RF power source. This system is composed of digital board cards based on FPGA, RF board cards, MTCA chassis and a frequency synthesis system. It works at 2856 MHz of S band, with phase and amplitude stability up to 0.2° and 0.04% respectively, which meets the top-off mode requirement of 0.25° RMS phase jitter of the digital low-level RF system in the HLS-II LINAC.
{"title":"Upgrade of low level RF system based on Micro Telecom Computing Architecture (MTCA) for HLS-II LINAC","authors":"Ren Tianqi, Tang Leilei, Zhou Zeran","doi":"10.11884/HPLPB202032.200080","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200080","url":null,"abstract":"The performance of Hefei Light Source II (HLS-II) has improved a lot after major maintenance and reconstruction. To further provide continuous and stable light, the RF system of the HLS-II LINAC needs to be upgraded for top-off mode. It is required that the RF power source have long-time stability and reliability, but the old analog low level RF system(LLRF) can’t meet the requirement. Hence a digital low level RF control system based on Micro Telecom Computing Architecture(MTCA) is designed and implemented to control the amplitude and phase of the RF power source. This system is composed of digital board cards based on FPGA, RF board cards, MTCA chassis and a frequency synthesis system. It works at 2856 MHz of S band, with phase and amplitude stability up to 0.2° and 0.04% respectively, which meets the top-off mode requirement of 0.25° RMS phase jitter of the digital low-level RF system in the HLS-II LINAC.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"084006-1-084006-5"},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44848825","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 : 2020-08-13DOI: 10.11884/HPLPB202032.190459
Zhai Hongyu, Cheng Jian, C. Yinhua, Lu Wei
The ion energy analyzer (IEA), also known as the retarding potential analyzer (RPA), is widely used as an important tool for measuring plasma energy in situ and is widely used in ionospheric detection satellites. The ion energy of the ionosphere is too low to be stabilized, thus the measurement characteristics of the IEA can’t be effectively studied through experiments. As there is no such problem in simulation, simulation has become a powerful tool for studying IEA. This paper analyzes the low-energy ion measurement characteristics of the IEA through the simulation software COMSOL, introduces the working principle of the IEA, and gives a comprehensive formula derivation for the ion measurement process. Based on simulation and analysis of three candidate design schemes, one of the schemes whose transmission curve is closest to the ideal step function is chosen. In theory, the measurement results of this scheme have the least error. The comprehensive error analysis results at various ion temperatures also show that the gap between the measurement results and the theoretical value of the scheme is narrow. The ion energy distribution can be measured more accurately. Finally, the effects of electric field distortion, plasma sheath, grid alignment and ion temperature are studied. According to these simulations, some experimental phenomena can be reasonably explained.
{"title":"Simulation study on measurement characteristics of ion energy analyzer","authors":"Zhai Hongyu, Cheng Jian, C. Yinhua, Lu Wei","doi":"10.11884/HPLPB202032.190459","DOIUrl":"https://doi.org/10.11884/HPLPB202032.190459","url":null,"abstract":"The ion energy analyzer (IEA), also known as the retarding potential analyzer (RPA), is widely used as an important tool for measuring plasma energy in situ and is widely used in ionospheric detection satellites. The ion energy of the ionosphere is too low to be stabilized, thus the measurement characteristics of the IEA can’t be effectively studied through experiments. As there is no such problem in simulation, simulation has become a powerful tool for studying IEA. This paper analyzes the low-energy ion measurement characteristics of the IEA through the simulation software COMSOL, introduces the working principle of the IEA, and gives a comprehensive formula derivation for the ion measurement process. Based on simulation and analysis of three candidate design schemes, one of the schemes whose transmission curve is closest to the ideal step function is chosen. In theory, the measurement results of this scheme have the least error. The comprehensive error analysis results at various ion temperatures also show that the gap between the measurement results and the theoretical value of the scheme is narrow. The ion energy distribution can be measured more accurately. Finally, the effects of electric field distortion, plasma sheath, grid alignment and ion temperature are studied. According to these simulations, some experimental phenomena can be reasonably explained.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"084002-1-084002-8"},"PeriodicalIF":0.0,"publicationDate":"2020-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46984602","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 : 2020-07-01DOI: 10.11884/HPLPB202032.200033
Zhou Yimei, Leng Yongbin, Xu Xing-yi, Gao Bo, Cao Shanshan
To further improve the accuracy of phase measurement, the Shanghai Synchrotron Radiation Facility (SSRF) Beam Instrumentation (BI) Group proposed a new signal processing method, the correlation function method, based on the bunch-by-bunch phase measurement system. This method calculates the bunch-by-bunch phase by performing pattern matching directly on all sampling points of the oscilloscope in the time domain. The advantage is that the data processing is only limited by the oscilloscope bandwidth, and more BPM (Beam Position Monitor) harmonic signals can be retained. The results show that increasing the BPM signal processing bandwidth can effectively remove the crosstalk between bunches and reduce the system measurement error caused by signal reflection. The principal component analysis (PCA) method is used to evaluate the phase measurement resolution, the larger bunch charge, the better the resolution. The precise phase dependence between the bunches can also be used to analyze the beam wake field and impedance in the storage ring.
{"title":"Signal processing algorithm optimization of bunch-by-bunch phase measurement system for storage ring","authors":"Zhou Yimei, Leng Yongbin, Xu Xing-yi, Gao Bo, Cao Shanshan","doi":"10.11884/HPLPB202032.200033","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200033","url":null,"abstract":"To further improve the accuracy of phase measurement, the Shanghai Synchrotron Radiation Facility (SSRF) Beam Instrumentation (BI) Group proposed a new signal processing method, the correlation function method, based on the bunch-by-bunch phase measurement system. This method calculates the bunch-by-bunch phase by performing pattern matching directly on all sampling points of the oscilloscope in the time domain. The advantage is that the data processing is only limited by the oscilloscope bandwidth, and more BPM (Beam Position Monitor) harmonic signals can be retained. The results show that increasing the BPM signal processing bandwidth can effectively remove the crosstalk between bunches and reduce the system measurement error caused by signal reflection. The principal component analysis (PCA) method is used to evaluate the phase measurement resolution, the larger bunch charge, the better the resolution. The precise phase dependence between the bunches can also be used to analyze the beam wake field and impedance in the storage ring.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"074002-1-074002-6"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45510484","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 : 2020-06-24DOI: 10.11884/HPLPB202032.200095
Li Jianbing, Lin Pengfei, Hao Bao-Liang, Sun Jianbang
Microwave power amplifiers are divided into vacuum and solid devices. This paper analyzes the principles, advantages and disadvantages of these two types of devices, and then introduces their development history, current technical research status and future development trends. This paper mainly introduces the microwave power module as it is the combination of these two devices, including its evolution process and current development status both home and abroad, and analyzes and predictes its future development.
{"title":"Overview of development of microwave power amplifiers","authors":"Li Jianbing, Lin Pengfei, Hao Bao-Liang, Sun Jianbang","doi":"10.11884/HPLPB202032.200095","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200095","url":null,"abstract":"Microwave power amplifiers are divided into vacuum and solid devices. This paper analyzes the principles, advantages and disadvantages of these two types of devices, and then introduces their development history, current technical research status and future development trends. This paper mainly introduces the microwave power module as it is the combination of these two devices, including its evolution process and current development status both home and abroad, and analyzes and predictes its future development.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"073001-1-073001-8"},"PeriodicalIF":0.0,"publicationDate":"2020-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42309847","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 : 2020-06-24DOI: 10.11884/HPLPB202032.200045
Liu Chang, Song Fa-lun, Zhu Mingdong, Li Chun-xia, Zhang Bei-zhen, Li Fei, Wang Gan-ping, Gong Haitao, Gan Yan-qing, Jin Xiao
To suppress the accumulation of charge on the surface of polytetrafluoroethylene (PTFE) material, radio frequency nitrogen plasma was generated to perform plasma immersion ion implantation (PIII) on the PTFE surface to improve its surface properties. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), water contact angle measurement, surface resistivity measurement and surface potential attenuation measurement were performed on the samples of PTFE material before and after injection to analyze the changes in surface composition and physical properties of PTFE samples after ion implantation treatment. Based on the theory of isothermal surface potential attenuation, the energy levels and density distributions of the surface traps were calculated. The results show that after nitrogen ion implantation, the main change in the chemical composition of the surface of the PTFE material is the destruction and conversion of its own molecular structure, and part of the CF2 structure is transformed into the CF and CF3 structures, resulting in shallower trap levels on the sample surface. The results also show that the water contact angle rose to about 140°, which is about 27° higher than that of the unprocessed sample. The surface resistivity drops to 3×1015 Ω, which is two orders of magnitude lower than that of the unprocessed samples. After 1 min of corona discharge on the surface, the amount of accumulated charge on the surface of the PTFE material processed with nitrogen ion implantation decreased, and the rate of dissipation increased. This is because the lower surface trap level is conducive to surface charge trapping, and the reduction in surface resistivity also promotes the dissipation process of surface charge along the surface. The curve of trap level distribution on the surface of PTFE sample also confirmed this.
{"title":"Influence of nitrogen ion implantation on surface charge accumulation and dissipation of polytetrafluoroethylene","authors":"Liu Chang, Song Fa-lun, Zhu Mingdong, Li Chun-xia, Zhang Bei-zhen, Li Fei, Wang Gan-ping, Gong Haitao, Gan Yan-qing, Jin Xiao","doi":"10.11884/HPLPB202032.200045","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200045","url":null,"abstract":"To suppress the accumulation of charge on the surface of polytetrafluoroethylene (PTFE) material, radio frequency nitrogen plasma was generated to perform plasma immersion ion implantation (PIII) on the PTFE surface to improve its surface properties. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), water contact angle measurement, surface resistivity measurement and surface potential attenuation measurement were performed on the samples of PTFE material before and after injection to analyze the changes in surface composition and physical properties of PTFE samples after ion implantation treatment. Based on the theory of isothermal surface potential attenuation, the energy levels and density distributions of the surface traps were calculated. The results show that after nitrogen ion implantation, the main change in the chemical composition of the surface of the PTFE material is the destruction and conversion of its own molecular structure, and part of the CF2 structure is transformed into the CF and CF3 structures, resulting in shallower trap levels on the sample surface. The results also show that the water contact angle rose to about 140°, which is about 27° higher than that of the unprocessed sample. The surface resistivity drops to 3×1015 Ω, which is two orders of magnitude lower than that of the unprocessed samples. After 1 min of corona discharge on the surface, the amount of accumulated charge on the surface of the PTFE material processed with nitrogen ion implantation decreased, and the rate of dissipation increased. This is because the lower surface trap level is conducive to surface charge trapping, and the reduction in surface resistivity also promotes the dissipation process of surface charge along the surface. The curve of trap level distribution on the surface of PTFE sample also confirmed this.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"075001-1-075001-10"},"PeriodicalIF":0.0,"publicationDate":"2020-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43173365","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 : 2020-06-24DOI: 10.11884/HPLPB202032.200088
Pan Xiaodong, Wei Guanghui, Wan Haojiang, L. Xinfu, Zhao Kai
According to the practical problem that some electronic equipments still exist electromagnetic incompatibility phenomenon in training and fighting stage after passing the normal electromagnetic compatibility test required by National Military Standard of China, on the basis of systematically analyzing the technical requirements and test methods in the current military standard, considering the technology accumulation of our research team on the electronic information equipment electromagnetic environment effects in recent years, the influence the several conditions on the electronic information equipment electromagnetic radiation susceptibility test results were discussed. These conditions contain not searching the sensitive receiving direction of the equipment under test(EUT), lacking of electromagnetic radiation susceptibility test in in-band frequency, multi-source radiation causing remarkable reduction of the susceptibility threshold of the EUT and so on. On the basis of the discussion, the measures and suggestions which can solve the above related problems were given. The development tendency of the high intensity electromagnetic radiation effect test technology and the complex electromagnetic environment adaptability evaluation technology for electronic equipment were discussed.
{"title":"Research on several test issues of electromagnetic radiation susceptibility for electronic equipment","authors":"Pan Xiaodong, Wei Guanghui, Wan Haojiang, L. Xinfu, Zhao Kai","doi":"10.11884/HPLPB202032.200088","DOIUrl":"https://doi.org/10.11884/HPLPB202032.200088","url":null,"abstract":"According to the practical problem that some electronic equipments still exist electromagnetic incompatibility phenomenon in training and fighting stage after passing the normal electromagnetic compatibility test required by National Military Standard of China, on the basis of systematically analyzing the technical requirements and test methods in the current military standard, considering the technology accumulation of our research team on the electronic information equipment electromagnetic environment effects in recent years, the influence the several conditions on the electronic information equipment electromagnetic radiation susceptibility test results were discussed. These conditions contain not searching the sensitive receiving direction of the equipment under test(EUT), lacking of electromagnetic radiation susceptibility test in in-band frequency, multi-source radiation causing remarkable reduction of the susceptibility threshold of the EUT and so on. On the basis of the discussion, the measures and suggestions which can solve the above related problems were given. The development tendency of the high intensity electromagnetic radiation effect test technology and the complex electromagnetic environment adaptability evaluation technology for electronic equipment were discussed.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"32 1","pages":"073002-1-073002-7"},"PeriodicalIF":0.0,"publicationDate":"2020-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42976225","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：