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2020 IEEE International Conference on Plasma Science (ICOPS)最新文献

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Measurement of Plasma Parameters by Floating Probe Method Using Tone Burst Signal 利用音突发信号的浮动探针法测量等离子体参数
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717913
Takeshi Katahira, M. Ohuchi, Shuichi Sato
{"title":"Measurement of Plasma Parameters by Floating Probe Method Using Tone Burst Signal","authors":"Takeshi Katahira, M. Ohuchi, Shuichi Sato","doi":"10.1109/ICOPS37625.2020.9717913","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717913","url":null,"abstract":"Langmuir probe method developed by Langmuir and Mott-Smith is generally used for plasma diagnosis. We have been studying the floating probe method to obtain the electron temperature from the change of the floating potential when an AC voltage is applied to the probe.1,2 This method was developed to improve the “probe contamination” and “plasma disturbance” problems of the classic Langmuir probe method.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115414014","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}
引用次数: 0
Breakdown of Composite Ester-Polymer Insulation Under Lightning Impulse Stress 雷电冲击应力下酯-聚合物复合绝缘击穿的研究
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717521
C. Williamson, I. Timoshkin, S. Macgregor, M. Wilson, M. Given, M. Sinclair, A. Jones
{"title":"Breakdown of Composite Ester-Polymer Insulation Under Lightning Impulse Stress","authors":"C. Williamson, I. Timoshkin, S. Macgregor, M. Wilson, M. Given, M. Sinclair, A. Jones","doi":"10.1109/ICOPS37625.2020.9717521","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717521","url":null,"abstract":"Ester fluids have emerged as a viable alternative to naphthenic transformer oil; resulting in significant research into the dielectric behaviours of these fluids. Focus has predominately been on bulk breakdown of insulating liquids stressed with standard 1.2/50μs Lightning Impulses and power frequency AC voltage.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115710554","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}
引用次数: 0
The Influence of Magnetic Shielding on the Magnetic Field Structure of Penning Ion Source 磁屏蔽对Penning离子源磁场结构的影响
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/icops37625.2020.9717479
Xie Mengjun, Liu Dagang, Liu Laqun, Wang Huihui
{"title":"The Influence of Magnetic Shielding on the Magnetic Field Structure of Penning Ion Source","authors":"Xie Mengjun, Liu Dagang, Liu Laqun, Wang Huihui","doi":"10.1109/icops37625.2020.9717479","DOIUrl":"https://doi.org/10.1109/icops37625.2020.9717479","url":null,"abstract":"The role of magnetic shielding is to protect the electromagnetic field of the source device from external interference and interference with nearby components or electronic circuits1. In this paper, using the Scalar Magnetic Potential finite-difference Method (SMPM)2, two different types of magnets (high permeability soft iron material and samarium-cobalt permanent magnet) magnetic fields are simulated and applied to the Penning ion source3, The results show that the addition of magnetic shielding makes a huge change in the magnetic field structure of some areas within the source, which is reflected in the decrease of the magnetic field in the local area and the sudden change of the magnetic field direction. At the same time, changes in the magnetic field structure will cause changes in the dynamic characteristics of the electrons in the source. We calculated the radial density of electrons in the Penning source, and the results showed that the addition of magnetic shielding is beneficial to reduce the fluctuation of electron density, thereby improving the uniformity of electron spatial distribution. The study of magnetic shielding is conducive to understanding the dynamic behavior of electrons and provides a reference for improving the source performance in the future.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121828257","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}
引用次数: 0
Improvement of Efficiency of Crashed Sand Production by Underwater Pulsed Discharge 提高水下脉冲出砂效率的研究
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717436
Noriyuki Izumi, Naoki Matsumoto, M. Matsuda, M. Shigeishi, Douyan Wang, T. Namihira
{"title":"Improvement of Efficiency of Crashed Sand Production by Underwater Pulsed Discharge","authors":"Noriyuki Izumi, Naoki Matsumoto, M. Matsuda, M. Shigeishi, Douyan Wang, T. Namihira","doi":"10.1109/ICOPS37625.2020.9717436","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717436","url":null,"abstract":"Concrete indispensable as building and roadbed material consists of coarse aggregates, fine aggregates, and cement pastes. Fine aggregates have been collected from riverbeds and seaside, or manufactured by cracking rocks from mountains area into small pieces with a crusher. Recently in Japan, it is banned to collect fine aggregates from rivers and sea because of the collection regulation due to fear of natural resource depletion. Therefore, the demand for regenerated fine aggregate and crushed sand as artificial aggregates have been increasing, and these are currently manufactured by a crasher which requires huge equipment. Therefore, new crushing technology is needed, and one of them is expected to be the crushing technology using pulse power. Pulsed power technology is possible to crack rocks by utilizing the dielectric breakdown phenomenon in liquids and the shock-wave generated by underwater discharge.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116715146","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}
引用次数: 0
Recent Advances in Beam Optics Analyzer 光束光学分析仪的最新进展
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717781
T. Bui, R. Ives, C. Mckenzie
{"title":"Recent Advances in Beam Optics Analyzer","authors":"T. Bui, R. Ives, C. Mckenzie","doi":"10.1109/ICOPS37625.2020.9717781","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717781","url":null,"abstract":"Calabazas Creek Research (CCR) recently added stress analysis coupled thermal analysis to BOA making it a complete multiphysics platform. It uses the same CAD model for all analysis types, from magnetostatics, electrostatics, and beam simulation to heat transfer and stress analysis. Parts in the original CAD model can be enabled/disabled per analysis type, and changing material of one part in one analysis type is automatically carried over to other types.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121097849","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}
引用次数: 1
Numerical Studies on the Non-Equilibrium Transport of Charged Particles in a Confined Decaying Plasma: Effects of the Ion Rarefaction Waves 限制衰变等离子体中带电粒子非平衡输运的数值研究:离子稀薄波的影响
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717465
Jian Chen, Yao-Ting Wang, He-ping Li, D. Jiang, Mingsheng Zhou
{"title":"Numerical Studies on the Non-Equilibrium Transport of Charged Particles in a Confined Decaying Plasma: Effects of the Ion Rarefaction Waves","authors":"Jian Chen, Yao-Ting Wang, He-ping Li, D. Jiang, Mingsheng Zhou","doi":"10.1109/ICOPS37625.2020.9717465","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717465","url":null,"abstract":"For a decaying plasma confined between two biased electrodes, previous studies mainly focused on the dynamics of the transient Child-Langmuir sheath. Our recent studies showed that, except for the sheath contributions, the propagations of the ion rarefaction waves during the plasma decaying process also play a significant role in determining the non-equilibrium transport processes of the charged particles[1][2][3] In this study, the influences of the initial key plasma parameters and the external energetic beams on the dynamic behaviors of the charged particles are analyzed and simulated based on the particle-in-cell (PIC) method. On the one hand, the influences of the ion rarefaction waves excited by the initial electron oscillations on the ambipolar component of the total ion flux are analyzed. This reveals the coupling of the initial electron temperature and plasma density on the transport of the charged particles[1],[2]. On the other hand, the externally injected electron beam interacts with the bulk plasmas, which enables the growth of a Langmuir standing wave. This would heat the bulk electrons, and lead to the increase of the ion flux to the electrodes[3].","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121109615","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}
引用次数: 0
Investigation of Oxychlorine Chemistry in Plasma Treated Saline Solutions 血浆处理生理盐水溶液中氧氯化学的研究
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/icops37625.2020.9717678
P. Lukeš, V. Jirásek
{"title":"Investigation of Oxychlorine Chemistry in Plasma Treated Saline Solutions","authors":"P. Lukeš, V. Jirásek","doi":"10.1109/icops37625.2020.9717678","DOIUrl":"https://doi.org/10.1109/icops37625.2020.9717678","url":null,"abstract":"The chemistry of plasma-liquid interaction is a fundamental process in biological activity of plasma on cancer cells. Various short and long-lived chemical species produced by plasma may participate in the cytotoxic and/or cell stimulation processes of plasma being in contact with the cells typically taking place through a liquid interface. These species can react at or penetrate through the plasma-gas/liquid interface and also initiate secondary chemical processes in the treated liquid/cell. The type and quantity of the reactive species formed by discharge plasma depend on the nature and the composition of the working gas and also on the properties of the liquid phase in the case of contact with plasma. It has been shown that several transient reactive oxygen and nitrogen species such as OH•, O2•-, NO• and NO2• radicals, peroxynitrite may be produced in plasma-treated liquids through post-discharge processes1. These species have highly cytotoxic properties and cause biochemical and antibacterial activity of plasma-treated solutions.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121269112","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}
引用次数: 0
Double Plasma Shock After Pinching in Table-Top Plasma Focus Device 台式等离子聚焦装置挤压后的双重等离子体冲击
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717503
I. Fitilis, A. Skoulakis, E. Kaselouris, E. Clark, J. Chatzakis, M. Bakarezos, V. Dimitriou, N. Papadogiannis, M. Tatarakis
{"title":"Double Plasma Shock After Pinching in Table-Top Plasma Focus Device","authors":"I. Fitilis, A. Skoulakis, E. Kaselouris, E. Clark, J. Chatzakis, M. Bakarezos, V. Dimitriou, N. Papadogiannis, M. Tatarakis","doi":"10.1109/ICOPS37625.2020.9717503","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717503","url":null,"abstract":"A study regarding the characterization of plasma sheath evolution after pinch time in a tabletop size plasma focus (PF), is presented in this work. A 300 J energy Mather-type PF device1,2 is used to carry out the experiments. Shadowgraphy probing using laser pulses of 150 ps duration is the diagnostic implemented for the plasma sheath evolution. Time-series of shadowgrams are used for the characterization of the plasma dynamics in later times after pinching. The expansion of the plasma sheath front in PF is found to be intersected axially by a secondary bubble-like shockwave front. The characteristics of the main and the secondary front dynamics are evaluated and correlated with the experimental parameters. A case of double shockwave is also presented. The obtained results are compared with relevant works and discussion concerning the source of the shockwave is made.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127314526","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}
引用次数: 0
Effect of Surface Degradation of Actuator on Electromagnetic Pulse Welding 致动器表面退化对电磁脉冲焊接的影响
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717698
Subhanarayan Sahoo
{"title":"Effect of Surface Degradation of Actuator on Electromagnetic Pulse Welding","authors":"Subhanarayan Sahoo","doi":"10.1109/ICOPS37625.2020.9717698","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717698","url":null,"abstract":"One of the high speed welding process among all the present welding techniques is Electromagnetic pulse welding (EMPW). Electromagnetic force from discharged current through Actuator responsible to develop a repulsive force between the induced current flowing parallel and in opposite direction. For successful weldment using this process the design of actuator is the most important factor due to high magnetic field on surface of work piece. In case of high quality welding factors such as impact velocity, impact angle standoff distance, flyer thickness and overlap length have to be chosen carefully. Still the surface of actuators plays vital role over all those above mentioned factors. EMPW has wide applications in nuclear industry, automotive industry, aerospace, electrical industries. However major issues such as formability and weldability still remain due to surface degradation. Surface degradation affects the magnetic field on surface of work piece. Due to ease in controlling the magnetic field enveloped inside tubes, the EMPW has been widely used for tube welding. In case of flat components control of magnetic field is difficult. Hence the application of EMPW gets restricted. But both tube and flat welding methods face same actuator surface degradation. The present work attempts to make a novel contribution by investigating the root cause of surface degradation and its elimination to improve welding quality in EMPW. The work emphasizes the approaches and engineering calculations required to effectively use of actuator in EMPW.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124845308","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}
引用次数: 0
Nonlinear THz Optical Response Of 3D Topological Dirac/Weyl Semimetals 三维拓扑Dirac/Weyl半金属的非线性太赫兹光学响应
2020 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2020-12-06 DOI: 10.1109/ICOPS37625.2020.9717592
Tianning Zhang, Y. Ang, L. Ang
{"title":"Nonlinear THz Optical Response Of 3D Topological Dirac/Weyl Semimetals","authors":"Tianning Zhang, Y. Ang, L. Ang","doi":"10.1109/ICOPS37625.2020.9717592","DOIUrl":"https://doi.org/10.1109/ICOPS37625.2020.9717592","url":null,"abstract":"The optical nonlinearity of three-dimension (3D) topological Dirac/Weyl semimetals is studied by calculating its Kerr effect and high harmonic generation in THz regime [1]. Analytical expressions of third-order interband nonlinear optical conductivities are obtained based on a quantum mechanical formalism which couples 3D Dirac fermions with multiple photons. Our findings reveal that the massless Dirac fermions in 3D semi-metals retains strong optical nonlinearity in terahertz frequency regime, comparable to the case of the two-dimensional Dirac fermions in graphene. Since 3D topological Dirac/Weyl semimetals possess bulk structural advantage not found in the strictly two-dimensional graphene, it may offer greater design flexibility and ease-of-fabrication for photonic and optoelectronic device applications as a viable alternative to graphene nonlinear optics applications.","PeriodicalId":122132,"journal":{"name":"2020 IEEE International Conference on Plasma Science (ICOPS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124947098","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}
引用次数: 0
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