Pub Date : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241900
S. Fedorov, M. Kozochkin, T. Maung, E. Mustafaev
The duration of SHS processes occurring in thin films or in near-surface layers of the product is several tens of milliseconds. Under these conditions, the effectiveness of monitoring the reaction of the formation of a new phase can ensured if there is a monitoring system that can build based on processing acoustic emission signals that have shown high sensitivity to transformations occurring in the surface layers of the material. However, a flexible system supplemented with a waveguide which can change its dynamic characteristics and amplitude-frequency response. Experiments have shown that using a wire with a cross-section of up to 2.5 mm2 as flexible waveguides allows reliable control of vibroacoustic processes in a vacuum chamber at frequencies up to 40 kHz at a distance of more than 2 meters without pre-tensioning. The influence of compaction when removing a conductor of sufficient cross-section from the vacuum chamber insignificantly worsens the values of the transmission coefficients. The article discusses the work of such a system, for example, of monitoring the formation of intermetallic compounds when exposed to pulse low-energy high-current electron beam on the plate of aluminum coated with a thin film of a heat-resistant Nickel alloy. Thanks to the analysis of vibroacoustic signals, it is possible to see how the exothermic chemical reaction proceeds, when the signal character changes. The clusters of points are formed on the graphs, distinguishable in the corresponding coordinates.
{"title":"Investigation of the Kinetics of the SHS Process, Initiated Using Electron-Beam Technology","authors":"S. Fedorov, M. Kozochkin, T. Maung, E. Mustafaev","doi":"10.1109/EFRE47760.2020.9241900","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241900","url":null,"abstract":"The duration of SHS processes occurring in thin films or in near-surface layers of the product is several tens of milliseconds. Under these conditions, the effectiveness of monitoring the reaction of the formation of a new phase can ensured if there is a monitoring system that can build based on processing acoustic emission signals that have shown high sensitivity to transformations occurring in the surface layers of the material. However, a flexible system supplemented with a waveguide which can change its dynamic characteristics and amplitude-frequency response. Experiments have shown that using a wire with a cross-section of up to 2.5 mm2 as flexible waveguides allows reliable control of vibroacoustic processes in a vacuum chamber at frequencies up to 40 kHz at a distance of more than 2 meters without pre-tensioning. The influence of compaction when removing a conductor of sufficient cross-section from the vacuum chamber insignificantly worsens the values of the transmission coefficients. The article discusses the work of such a system, for example, of monitoring the formation of intermetallic compounds when exposed to pulse low-energy high-current electron beam on the plate of aluminum coated with a thin film of a heat-resistant Nickel alloy. Thanks to the analysis of vibroacoustic signals, it is possible to see how the exothermic chemical reaction proceeds, when the signal character changes. The clusters of points are formed on the graphs, distinguishable in the corresponding coordinates.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128204123","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241966
E. Koryukina, V. Koryukin
A unified approach is developed for calculating profiles of spectral lines of atoms in an alternating electric field. This numerical method is based on diagonalization of the energy matrix of an atom in the electric field. To calculate the Stark profile of a spectral line, a formula is proposed, where the profile width contains an explicit dependence on the parameters of the electric field. The algorithm of the method is implemented in the software package StarkD written in FORTRAN and Maple. In the framework of the proposed approach, a computer simulation of the spectral lines of the helium atom in alternating electric fields of linear and circular polarizations is performed.
{"title":"Modelling Line Profiles in the Helium Spectra Excited By an Alternating Electric Field","authors":"E. Koryukina, V. Koryukin","doi":"10.1109/EFRE47760.2020.9241966","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241966","url":null,"abstract":"A unified approach is developed for calculating profiles of spectral lines of atoms in an alternating electric field. This numerical method is based on diagonalization of the energy matrix of an atom in the electric field. To calculate the Stark profile of a spectral line, a formula is proposed, where the profile width contains an explicit dependence on the parameters of the electric field. The algorithm of the method is implemented in the software package StarkD written in FORTRAN and Maple. In the framework of the proposed approach, a computer simulation of the spectral lines of the helium atom in alternating electric fields of linear and circular polarizations is performed.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129939418","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242058
A. Ryabchikov, S. Dektyarev, O. Korneva, I. Lopatin, D. Sivin, Y. Ivanov
Low energy, high intensity ion implantation method opens up unique opportunities for ion-doping of metals and alloys at depths of tens and hundreds of micrometers. Ion implantation at ion current densities of tens and hundreds of mA/cm2 is carried out at elevated temperatures of the surface layers of the irradiated target. High temperatures can lead to an increase in the grain size of crystalline materials and, as a result, to a degradation of material properties. One of the possible solutions to this problem seems to be a combination of high-intensity implantation of ions with subsequent exposure to the surface of a high-current electron beam. The paper presents the results of studies of the features of changes in the elemental composition and microstructure of titanium alloy during high-intensity implantation of nitrogen, aluminum ions of low and ultra-low energy. The influence of the target temperature regimes on the depth distribution of the implanted dopant and the structure of doped and matrix material is studied. The influence of subsequent modification of the ion-doped layer by the action on the surface of the pulsed high-current electron beams of microsecond duration is studied. The work presents the results of the studying the regularities of changes in the depth distribution of alloying elements, microstructure and phase composition of the modified and matrix layers by optical metallography, x-ray spectral and x-ray structural analysis.
{"title":"Investigation of Regularities of High-Intensity Ion Implantation in Combination with Subsequent Exposure to the Surface of a High-Current Electron Beam","authors":"A. Ryabchikov, S. Dektyarev, O. Korneva, I. Lopatin, D. Sivin, Y. Ivanov","doi":"10.1109/EFRE47760.2020.9242058","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242058","url":null,"abstract":"Low energy, high intensity ion implantation method opens up unique opportunities for ion-doping of metals and alloys at depths of tens and hundreds of micrometers. Ion implantation at ion current densities of tens and hundreds of mA/cm2 is carried out at elevated temperatures of the surface layers of the irradiated target. High temperatures can lead to an increase in the grain size of crystalline materials and, as a result, to a degradation of material properties. One of the possible solutions to this problem seems to be a combination of high-intensity implantation of ions with subsequent exposure to the surface of a high-current electron beam. The paper presents the results of studies of the features of changes in the elemental composition and microstructure of titanium alloy during high-intensity implantation of nitrogen, aluminum ions of low and ultra-low energy. The influence of the target temperature regimes on the depth distribution of the implanted dopant and the structure of doped and matrix material is studied. The influence of subsequent modification of the ion-doped layer by the action on the surface of the pulsed high-current electron beams of microsecond duration is studied. The work presents the results of the studying the regularities of changes in the depth distribution of alloying elements, microstructure and phase composition of the modified and matrix layers by optical metallography, x-ray spectral and x-ray structural analysis.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"09 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130742107","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242056
I. Filatov, V. Uvarin, D. Kuznetsov
Unsaturated volatile organic compounds (VOCs) are an important pollutant of industrial ventilation air emissions. The presence of a double bond in the composition of their molecules increases their reactivity with respect to plasma components generated by a pulsed corona discharge. This paper presents studies of the influence of the nature and structure of unsaturated VOCs on the efficiency of their destruction under the action of pulsed corona discharge with a duration of 20–45 ns. The method of competing reactions based on the investigation of mixtures of the studied compounds is proposed as a research tool. The method allows us to determine the relative reactivity of compounds with high accuracy and identify the main mechanisms. The obtained results showed that the cleaning efficiency for compounds that do not contain chlorine in their composition correlates well with their reactivity with respect to ozone. Halogen-containing unsaturated compounds, in contrast, are resistant to ozone and are removed more efficiently in nitrogen than in air. The found regularities will be useful for the development of air purification systems in the production of plastics and processes involving halogen-containing solvents.
{"title":"Investigation of the Relative Reactivity of Unsaturated Volatile Organic Compounds in Air Under the Action of Pulsed Corona Discharge Plasma","authors":"I. Filatov, V. Uvarin, D. Kuznetsov","doi":"10.1109/EFRE47760.2020.9242056","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242056","url":null,"abstract":"Unsaturated volatile organic compounds (VOCs) are an important pollutant of industrial ventilation air emissions. The presence of a double bond in the composition of their molecules increases their reactivity with respect to plasma components generated by a pulsed corona discharge. This paper presents studies of the influence of the nature and structure of unsaturated VOCs on the efficiency of their destruction under the action of pulsed corona discharge with a duration of 20–45 ns. The method of competing reactions based on the investigation of mixtures of the studied compounds is proposed as a research tool. The method allows us to determine the relative reactivity of compounds with high accuracy and identify the main mechanisms. The obtained results showed that the cleaning efficiency for compounds that do not contain chlorine in their composition correlates well with their reactivity with respect to ozone. Halogen-containing unsaturated compounds, in contrast, are resistant to ozone and are removed more efficiently in nitrogen than in air. The found regularities will be useful for the development of air purification systems in the production of plastics and processes involving halogen-containing solvents.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132901685","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242075
E. Oreshkin, V. Oreshkin, S. Barengolts, G. Mesyats, Konstantin V. Khischenko
This report presents results of a numerical simulation of the electrical explosion of a cathode microprotrusion initiated by explosive emission current. The microexplosion parameters (the pre-explosion time and the specific current action integral) have been estimated in relation to the geometry (current density) of the microprotrusion and the type (direct-current and high-frequency) voltage across the diode. The variations in the main parameters of the cathode material (temperature and density) during such a microexplosion are investigated for tungsten and copper cathodes.
{"title":"Effect of the Geometry of Cathode Microprotrusions on the Parameters of the Explosive Emission Processes","authors":"E. Oreshkin, V. Oreshkin, S. Barengolts, G. Mesyats, Konstantin V. Khischenko","doi":"10.1109/EFRE47760.2020.9242075","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242075","url":null,"abstract":"This report presents results of a numerical simulation of the electrical explosion of a cathode microprotrusion initiated by explosive emission current. The microexplosion parameters (the pre-explosion time and the specific current action integral) have been estimated in relation to the geometry (current density) of the microprotrusion and the type (direct-current and high-frequency) voltage across the diode. The variations in the main parameters of the cathode material (temperature and density) during such a microexplosion are investigated for tungsten and copper cathodes.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122236404","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241922
L. Orlikov, Xenia Mambetova, S. Arestov, S. Shandarov, N. Burimov, B. Avdochenko, A. Elchaninov
The conditions of electron flow generation during heating and cooling of a cylindrical lithium niobate crystal with a diameter of 13 mm and a height of 7 mm with a Z-oriented axis of polarization were studied. Studies were conducted at a pressure of 105–1 Pa. It was found that the discharge begins to form in the sub nanosecond range. At a pressure of more than 1 Pa, a gas breakdown on the crystal surface contributes to the discharge current. The preparation of the crystal and the coordination of the indication system made it possible to develop a pyroelectric source of electrons, designed for a discharge voltage of ∼100 kV with a discharge current of ∼400 mA for the microsecond and nanosecond ranges.
{"title":"Pulse Source of Electrons Based on the Pyroeffect","authors":"L. Orlikov, Xenia Mambetova, S. Arestov, S. Shandarov, N. Burimov, B. Avdochenko, A. Elchaninov","doi":"10.1109/EFRE47760.2020.9241922","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241922","url":null,"abstract":"The conditions of electron flow generation during heating and cooling of a cylindrical lithium niobate crystal with a diameter of 13 mm and a height of 7 mm with a Z-oriented axis of polarization were studied. Studies were conducted at a pressure of 105–1 Pa. It was found that the discharge begins to form in the sub nanosecond range. At a pressure of more than 1 Pa, a gas breakdown on the crystal surface contributes to the discharge current. The preparation of the crystal and the coordination of the indication system made it possible to develop a pyroelectric source of electrons, designed for a discharge voltage of ∼100 kV with a discharge current of ∼400 mA for the microsecond and nanosecond ranges.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114065626","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242118
A. Knyazeva, E. Korosteleva, I. Nikolaev
In this study, the structure formation of multicomponent composites based on Ti-C-Al, Ti-Al-C-Fe2O3 and Ti-Al-C-TiO2 powder mixtures under combine synthesis are considered. The features of Ti-C-Al, Ti-Al-C-Fe2O3 and Ti-Al-C-TiO2 composition synthesis that was accompanied by the formation of MAX phases and intermetallic compounds with different properties is studied theoretically and experimentally. An attempt is made to determine conditions and compositions of the starting powder mixtures for the powders composite materials with a complex multiphase structure. It is shown that during simultaneous process of wave combustion and metallothermy the inclusion and a matrix structure are formed with fundamentally different properties. Depending on the combination of the initial powder mixtures a metal matrix composite or ceramic composite can be formed. Metallothermal reactions initiated to obtain composites with oxide inclusions (in Ti-Al-C-Fe2O3 and Ti-Al-C-TiO2 powder systems) results in the occurrence of the non-equilibrium phases. These phases are not predicted from the preliminary thermodynamic evaluation but can be predicted based on thermokinetic models that include a set of possible chemical stages. It was shown that, in addition to intermetallic phases, the composition of the synthesis products includes the Ti2AlC phase which could be synthesized both in the combination with Fe2O3 and using TiO2.
{"title":"Features of the Synthesis of TiCAl (Fe2O3/TiO2) Metal Matrix Composites under Nonequilibrium Conditions","authors":"A. Knyazeva, E. Korosteleva, I. Nikolaev","doi":"10.1109/EFRE47760.2020.9242118","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242118","url":null,"abstract":"In this study, the structure formation of multicomponent composites based on Ti-C-Al, Ti-Al-C-Fe2O3 and Ti-Al-C-TiO2 powder mixtures under combine synthesis are considered. The features of Ti-C-Al, Ti-Al-C-Fe2O3 and Ti-Al-C-TiO2 composition synthesis that was accompanied by the formation of MAX phases and intermetallic compounds with different properties is studied theoretically and experimentally. An attempt is made to determine conditions and compositions of the starting powder mixtures for the powders composite materials with a complex multiphase structure. It is shown that during simultaneous process of wave combustion and metallothermy the inclusion and a matrix structure are formed with fundamentally different properties. Depending on the combination of the initial powder mixtures a metal matrix composite or ceramic composite can be formed. Metallothermal reactions initiated to obtain composites with oxide inclusions (in Ti-Al-C-Fe2O3 and Ti-Al-C-TiO2 powder systems) results in the occurrence of the non-equilibrium phases. These phases are not predicted from the preliminary thermodynamic evaluation but can be predicted based on thermokinetic models that include a set of possible chemical stages. It was shown that, in addition to intermetallic phases, the composition of the synthesis products includes the Ti2AlC phase which could be synthesized both in the combination with Fe2O3 and using TiO2.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114161473","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241990
A. Saifutdinova, B. Timerkaev, A. Saifutdinov
This work presents the results of a two-stage experimental study on the synthesis of carbon nanostructures from liquid hydrocarbons. At the first stage, fullerene soot and carbon micro- and nanostructures are synthesized on the electrode upon initiation of a microarc discharge in liquid hydrocarbons. At the second stage, an electrode with carbon micro- and nanostructures is used as an anode of an arc discharge in argon at a pressure of 500 Torr. During arc initiation, at the second stage, active evaporation of atomic carbon from the anode and synthesis of nanostructures at the molybdenum cathode are observed. The results of electron microscopy studies showed the presence of nanotubes and nanodiamonds at the cathode.
{"title":"Synthesis of Nanodiamonds from Fuel Oil Processing Products Using an Arc Discharge","authors":"A. Saifutdinova, B. Timerkaev, A. Saifutdinov","doi":"10.1109/EFRE47760.2020.9241990","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241990","url":null,"abstract":"This work presents the results of a two-stage experimental study on the synthesis of carbon nanostructures from liquid hydrocarbons. At the first stage, fullerene soot and carbon micro- and nanostructures are synthesized on the electrode upon initiation of a microarc discharge in liquid hydrocarbons. At the second stage, an electrode with carbon micro- and nanostructures is used as an anode of an arc discharge in argon at a pressure of 500 Torr. During arc initiation, at the second stage, active evaporation of atomic carbon from the anode and synthesis of nanostructures at the molybdenum cathode are observed. The results of electron microscopy studies showed the presence of nanotubes and nanodiamonds at the cathode.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"63 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120898764","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9241970
V. Kokshenev, A. Rousskikh, A. Shishlov, A. Zhigalin, N. Kurmaev, R. Baksht, R. Cherdizov, Vladimir I. Oreshkin
The structure and characteristics of the current sheath formed in a metal-puff with an external plasma shell were studied with a current flowing up to 2.5 MA in amplitude with a microsecond rise time. It is shown that in the system used, a compact and uniform in azimuth current sheath is formed already in the early stage of implosion, which stabilizes the process of compression of the liner from large diameters in the microsecond regime. The thickness of the current sheath decreases as it moves toward the center, and the average current density increases and amounts to tens of kA/cm2. According to B-dot data, the velocity of the current sheath exceeds the speed of sound in the liner plasma, leading to the appearance of a shock wave and compression of the plasma on the axis. A stable shell with a high current density, together with a density profile formed in the Z-pinch configuration, ensures stable liner implosion from an initial diameter of 32 cm to a pinch with a diameter of several mm.
{"title":"Formation and Dynamics of the Current Sheath in the Plasma Shell of a Z-Pinch in the Microsecond Implosion Regime","authors":"V. Kokshenev, A. Rousskikh, A. Shishlov, A. Zhigalin, N. Kurmaev, R. Baksht, R. Cherdizov, Vladimir I. Oreshkin","doi":"10.1109/EFRE47760.2020.9241970","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9241970","url":null,"abstract":"The structure and characteristics of the current sheath formed in a metal-puff with an external plasma shell were studied with a current flowing up to 2.5 MA in amplitude with a microsecond rise time. It is shown that in the system used, a compact and uniform in azimuth current sheath is formed already in the early stage of implosion, which stabilizes the process of compression of the liner from large diameters in the microsecond regime. The thickness of the current sheath decreases as it moves toward the center, and the average current density increases and amounts to tens of kA/cm2. According to B-dot data, the velocity of the current sheath exceeds the speed of sound in the liner plasma, leading to the appearance of a shock wave and compression of the plasma on the axis. A stable shell with a high current density, together with a density profile formed in the Z-pinch configuration, ensures stable liner implosion from an initial diameter of 32 cm to a pinch with a diameter of several mm.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116588419","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 : 2020-09-14DOI: 10.1109/EFRE47760.2020.9242175
S. Chaikovsky, I. Datsko, N. Labetskaya, D. Rybka, Vladimir I. Oreshkin
Experiments on the high-current MIG generator at a current of up to 2.5 MA rising in 100 ns were performed to study the electrical explosion of cylindrical copper conductors with circular steps in a magnetic field of 200–800 T. Such a stepped load allowed us to analyze the plasma dynamics at different values of magnetic induction in the same experiment. At about 300–400 T, visible radiation from the conductor surface appeared, and when the conductor was illuminated by an external radiation source, radial plasma jets from the edges of its steps were detected. The velocity of plasma jets was up to 2.7.106 cm/s, being 5–6 times higher than the velocity of surface plasma expansion.
{"title":"Skin Explosions of Stepped Cylindrical Copper Conductors","authors":"S. Chaikovsky, I. Datsko, N. Labetskaya, D. Rybka, Vladimir I. Oreshkin","doi":"10.1109/EFRE47760.2020.9242175","DOIUrl":"https://doi.org/10.1109/EFRE47760.2020.9242175","url":null,"abstract":"Experiments on the high-current MIG generator at a current of up to 2.5 MA rising in 100 ns were performed to study the electrical explosion of cylindrical copper conductors with circular steps in a magnetic field of 200–800 T. Such a stepped load allowed us to analyze the plasma dynamics at different values of magnetic induction in the same experiment. At about 300–400 T, visible radiation from the conductor surface appeared, and when the conductor was illuminated by an external radiation source, radial plasma jets from the edges of its steps were detected. The velocity of plasma jets was up to 2.7.106 cm/s, being 5–6 times higher than the velocity of surface plasma expansion.","PeriodicalId":190249,"journal":{"name":"2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121710970","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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