Numerical simulations of the negative corona at a constant applied voltage in the Trichel pulse mode are carried out for different contents of an electronegative gas component. The dependences of the total current peak value and the time interval between pulses on the values of the applied voltage and the content of electronegative components are obtained. The results are somewhat explained using simplified models.
{"title":"NUMERICAL SIMULATION OF REPRODUCTION OF THE DEVELOPMENT CONDITIONS OF THE NEXT TRICHEL PULSE IN NEGATIVE CORONA","authors":"V. Ostroushko","doi":"10.46813/2023-146-134","DOIUrl":"https://doi.org/10.46813/2023-146-134","url":null,"abstract":"Numerical simulations of the negative corona at a constant applied voltage in the Trichel pulse mode are carried out for different contents of an electronegative gas component. The dependences of the total current peak value and the time interval between pulses on the values of the applied voltage and the content of electronegative components are obtained. The results are somewhat explained using simplified models.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"217 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79671823","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}
Jupiter’s moons are constantly bombarded by ions produced by the giant planet’s plasma magnetosphere. The influence is considered as one of the main sources of the moons’ atmosphere and surface modification. This investigation is an attempt to explore the interaction of space ions with Ganymede’s magnetosphere. Computer simulations are performed using electromagnetic fields that are close to experimentally observed fields in previous Jupiter space missions.
{"title":"MODELING THE INTERACTION OF JUPITER'S MAGNETOSPHERIC PLASMA IONS WITH SATELLITE","authors":"O. Khelemelia, A. Fomina, O. Novak, R. Kholodov","doi":"10.46813/2023-146-117","DOIUrl":"https://doi.org/10.46813/2023-146-117","url":null,"abstract":"Jupiter’s moons are constantly bombarded by ions produced by the giant planet’s plasma magnetosphere. The influence is considered as one of the main sources of the moons’ atmosphere and surface modification. This investigation is an attempt to explore the interaction of space ions with Ganymede’s magnetosphere. Computer simulations\u0000are performed using electromagnetic fields that are close to experimentally observed fields in previous Jupiter space missions.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"53 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81631919","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}
N. Gaponenko, V. A. Soshenko, B. V. Zajtsev, V.G. Zhuravlyov
The high-voltage rectifier modernization, which is part of helium accelerator (PSS-4) high-frequency system, is described. The rectifier supplies the pulse modulator with direct current energy. The valves of the modulator used are mercury thyratrons. Modernization involves replacing thyratrons with semiconductor diodes. In the article, a comparative analysis of the parameters of thyratrons and diodes, which are supposed to be replaced by thyratrons, is carried out, and the expediency of such a replacement is substantiated.
{"title":"MODERNIZATION OF THE HELIUM ION ACCELERATOR MICROWAVE POWER SUPPLY SYSTEM","authors":"N. Gaponenko, V. A. Soshenko, B. V. Zajtsev, V.G. Zhuravlyov","doi":"10.46813/2023-146-088","DOIUrl":"https://doi.org/10.46813/2023-146-088","url":null,"abstract":"The high-voltage rectifier modernization, which is part of helium accelerator (PSS-4) high-frequency system, is described. The rectifier supplies the pulse modulator with direct current energy. The valves of the modulator used are mercury thyratrons. Modernization involves replacing thyratrons with semiconductor diodes. In the article, a comparative analysis of the parameters of thyratrons and diodes, which are supposed to be replaced by thyratrons, is carried out, and the expediency of such a replacement is substantiated.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"108 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79981933","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}
It is shown that the known conditions for cyclotron resonances are strictly valid only under autoresonance conditions or in the nonrelativistic case. In other cases, it is necessary to use the conditions established in the present work. The main features of charged particle dynamics under new resonant conditions are presented. Conditions are found for infinite acceleration of electrons by a transverse electromagnetic wave in a vacuum without a magnetic field.
{"title":"FEATURES OF NEW CYCLOTRON RESONANCES, AS WELL AS CONDITIONS FOR RESONANT ACCELERATION OF CHARGED PARTICLES IN A VACUUM WITHOUT A MAGNETIC FIELD","authors":"V. Buts, A. Zagorodny","doi":"10.46813/2023-146-003","DOIUrl":"https://doi.org/10.46813/2023-146-003","url":null,"abstract":"It is shown that the known conditions for cyclotron resonances are strictly valid only under autoresonance conditions or in the nonrelativistic case. In other cases, it is necessary to use the conditions established in the present work. The main features of charged particle dynamics under new resonant conditions are presented. Conditions are found for\u0000infinite acceleration of electrons by a transverse electromagnetic wave in a vacuum without a magnetic field.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"17 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78201635","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}
I. Onishchenko, K. Galaydych, R. Kniaziev, G.O. Krivonosov, A. Linnik, P. Markov, O. L. Omelayenko, V. I. Pristupa, G. Sotnikov, V. Us, D.Yu. Zaleskiy
A theoretical and experimental study of wakefield excitation by a profiled sequence of relativistic electron bunches in the plasma-dielectric structure, the parameters of which provide the conditions for the excitation of a small decelerating field for all driver bunches with simultaneous growth with the number of bunches of the accelerating total wakefield was carried out. Theoretically, the transformation ratio was found for the parameters of the experiment as the ratio of the total wakefield of the sequence to the field that decelerates driver bunches. In the performed experiments, the total wakefield was measured by the microwave probe. The magnitude of the decelerating field is determined by the shift of the maximum of the spectrum measured by the magnetic analyzer before and after wakefield excitation in the structure. The obtained transformation ratio increases with the number of bunches in the sequence and significantly exceeds this one for a nonprofiled sequence.
{"title":"ELABORATION OF THE PLASMA-DIELECTRIC WAKEFIELD ACCELERATOR WITH A PROFILED SEQUENCE OF DRIVER ELECTRON BUNCHES","authors":"I. Onishchenko, K. Galaydych, R. Kniaziev, G.O. Krivonosov, A. Linnik, P. Markov, O. L. Omelayenko, V. I. Pristupa, G. Sotnikov, V. Us, D.Yu. Zaleskiy","doi":"10.46813/2023-146-053","DOIUrl":"https://doi.org/10.46813/2023-146-053","url":null,"abstract":"A theoretical and experimental study of wakefield excitation by a profiled sequence of relativistic electron bunches in the plasma-dielectric structure, the parameters of which provide the conditions for the excitation of a small decelerating field for all driver bunches with simultaneous growth with the number of bunches of the accelerating total wakefield was carried out. Theoretically, the transformation ratio was found for the parameters of the experiment as the ratio of the total wakefield of the sequence to the field that decelerates driver bunches. In the performed experiments, the total wakefield was measured by the microwave probe. The magnitude of the decelerating field is determined by the shift of the maximum of the spectrum measured by the magnetic analyzer before and after wakefield excitation in the structure. The obtained transformation ratio increases with the number of bunches in the sequence and significantly exceeds this one for a nonprofiled sequence.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"26 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84513768","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}
This work focuses on diagnosing the plasma in an electric arc discharge in an argon flow using optical emission spectroscopy. The method employed for determining the population of energy levels and the concentration of metal atoms based on the absolute values of emission intensity is described and validated. The experimental setup includes a spectrograph and an RGB CMOS matrix as the emission registration device. By obtaining the absolute values of the spectral radiances of Cu I lines and considering the axial symmetry of the electric arc discharge, the local radiation intensity of these lines is determined. Radial distributions of copper atom concentrations are then calculated using the absolute values of emission intensities and the radial distribution of the excitation temperature, which is determined using the Boltzmann plots technique. Two methods are employed for calculating the atom concentrations. The first method involves Boltzmann plots based on four spectral lines of Cu I and the corresponding excitation temperature. The second method determines the concentrations directly from the population of copper's energy levels, which are derived from the absolute values of emission intensity of the Cu I spectral lines. The results obtained from these two methods exhibit a coincidence of within 20%, supporting the recommendation of this technique for plasma diagnostics in electric arc discharges.
{"title":"INVESTIGATION OF SPATIAL DISTRIBUTION OF METAL VAPOURS ADMIXTURES IN THE PLASMA OF AN ELECTRIC ARC DISCHARGE","authors":"A. Murmantsev","doi":"10.46813/2023-146-139","DOIUrl":"https://doi.org/10.46813/2023-146-139","url":null,"abstract":"This work focuses on diagnosing the plasma in an electric arc discharge in an argon flow using optical emission spectroscopy. The method employed for determining the population of energy levels and the concentration of metal atoms based on the absolute values of emission intensity is described and validated. The experimental setup includes\u0000a spectrograph and an RGB CMOS matrix as the emission registration device. By obtaining the absolute values of the spectral radiances of Cu I lines and considering the axial symmetry of the electric arc discharge, the local radiation intensity of these lines is determined. Radial distributions of copper atom concentrations are then calculated\u0000using the absolute values of emission intensities and the radial distribution of the excitation temperature, which is determined using the Boltzmann plots technique. Two methods are employed for calculating the atom concentrations. The first method involves Boltzmann plots based on four spectral lines of Cu I and the corresponding excitation temperature. The second method determines the concentrations directly from the population of copper's energy levels, which are derived from the absolute values of emission intensity of the Cu I spectral lines. The results obtained from these two methods exhibit a coincidence of within 20%, supporting the recommendation of this technique for plasma diagnostics in electric arc discharges.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"69 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75051380","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}
The time evolution of the formation of a plasma density cavity caused by inhomogeneous stochastic electric fields is investigated. The Fokker-Planck equation, which governs the temporal evolution of the plasma electron density due to localized stochastic inhomogeneous electric fields in the frequency range of lower hybrid oscillations, is solved numerically. The spatial dependence of the plasma electron density for various times is obtained.
{"title":"TEMPORAL EVOLUTION OF THE PLASMA DENSITY CAVITY CAUSED BY INHOMOGENEOUS STOCHASTIC ELECTRIC FIELDS","authors":"N. Azarenkov, D. Chibisov, O. Chibisov","doi":"10.46813/2023-146-021","DOIUrl":"https://doi.org/10.46813/2023-146-021","url":null,"abstract":"The time evolution of the formation of a plasma density cavity caused by inhomogeneous stochastic electric fields is investigated. The Fokker-Planck equation, which governs the temporal evolution of the plasma electron density due to localized stochastic inhomogeneous electric fields in the frequency range of lower hybrid oscillations,\u0000is solved numerically. The spatial dependence of the plasma electron density for various times is obtained.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"16 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79775594","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}
Kinetic models of magnetized current-carrying plasma have been developed to study the influence of magnetic drift effects on the wave-particle interactions in tokamaks and cylindrical plasma columns. The drift-kinetic equations are derived for the perturbed distribution functions of trapped and untrapped particles in a two-dimensional axisymmetric toroidal plasma, taking into account their bounce oscillations and the finite orbit-widths of their banana trajectories.
{"title":"DRIFT-KINETIC EQUATIONS IN MAGNETIZED CURRENT-CARRYING PLASMAS","authors":"N. Grishanov, N. Azarenkov","doi":"10.46813/2023-146-027","DOIUrl":"https://doi.org/10.46813/2023-146-027","url":null,"abstract":"Kinetic models of magnetized current-carrying plasma have been developed to study the influence of magnetic drift effects on the wave-particle interactions in tokamaks and cylindrical plasma columns. The drift-kinetic equations are derived for the perturbed distribution functions of trapped and untrapped particles in a two-dimensional\u0000axisymmetric toroidal plasma, taking into account their bounce oscillations and the finite orbit-widths of their\u0000banana trajectories.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"4 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75960424","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}
V. Butenko, A. Cenian, O. Dyachenko, O. Manuilenko, K. V. Pavlii, M. Sawczak, B. V. Zajtsev, V. Zhurba
On the linear accelerator of helium ions, the irradiation of TiO2-2 samples with ions energy of 0.12 and 4 MeV to doses of ≈ 1∙1018 ion/cm2 is executed. The elemental composition of TiO2-2 samples is made by roentgenfluorescence method. After irradiation a change of electrophysical characteristics is investigated, microscopic researches on electronic and optical microscopes are conducted. Numerical calculations of atom sputtering ratios taking into account of input angles of helium ions in a sample, and also phonons formation, atoms redistribution (segregation), appearance of the vacancies and displacements in TiO2-2 sample are made. Processes of the flaking formation are investigated, and also presence of the metallization effect and long-range interaction effect in the irradiated samples is shown
{"title":"TiO2-2 RADIATING DAMAGES AS A RESULT OF THE IRRADIATION HELIUM IONS WITH ENERGIES OF 0.12 AND 4 MeV ON THE LINEAR ACCELERATOR","authors":"V. Butenko, A. Cenian, O. Dyachenko, O. Manuilenko, K. V. Pavlii, M. Sawczak, B. V. Zajtsev, V. Zhurba","doi":"10.46813/2023-146-096","DOIUrl":"https://doi.org/10.46813/2023-146-096","url":null,"abstract":"On the linear accelerator of helium ions, the irradiation of TiO2-2 samples with ions energy of 0.12 and 4 MeV to doses of ≈ 1∙1018 ion/cm2 is executed. The elemental composition of TiO2-2 samples is made by roentgenfluorescence method. After irradiation a change of electrophysical characteristics is investigated, microscopic researches on electronic and optical microscopes are conducted. Numerical calculations of atom sputtering ratios taking into account of input angles of helium ions in a sample, and also phonons formation, atoms redistribution (segregation), appearance of the vacancies and displacements in TiO2-2 sample are made. Processes of the flaking formation are investigated, and also presence of the metallization effect and long-range interaction effect in the irradiated samples is shown","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"138 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77502129","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}
The acceleration of particles to the high energy is one of the key issues of solar physics, cis-lunar irradiations, astrophysics, and astroparticle physics. With the development of space astronomy, people started to realize that plasma disturbances in solar flares, Earth’s magnetosphere, and interplanetary space can also produce a large population of non-thermal particles. Cosmic ray promotion i.e. selective energization of matter in the cosmos requires, as on earth, three distinct stages: ionization, injection and acceleration to high energy. Supernova remnants and stellar winds of massive stars grouped in associations appear to be excellent celestial accelerators or re-accelerators through the shock waves they induce in their superbubbles. The injection of ions seems devoted to stars, except the smaller ones. In cosmic several mechanisms lead charged particle acceleration. Electrons are accelerated in direction of Earth’s poles by long train of electric double layers of small amplitudes. Charged particles are accelerated by the pondermotive force of electromagnetic radiation. Also, in a nonequilibrium current plasma or a plasma with particle flows, a strong electric double layer can be formed, which accelerates charged particles to high energies. The reconnection of the magnetic field lines also leads to the acceleration of charged particles.
{"title":"COSMIC RAY SOURCE AND SOLAR ENERGETIC PARTICLES","authors":"M. Cassé, V. Maslov","doi":"10.46813/2023-146-109","DOIUrl":"https://doi.org/10.46813/2023-146-109","url":null,"abstract":"The acceleration of particles to the high energy is one of the key issues of solar physics, cis-lunar irradiations, astrophysics, and astroparticle physics. With the development of space astronomy, people started to realize that plasma disturbances in solar flares, Earth’s magnetosphere, and interplanetary space can also produce a large population of non-thermal particles. Cosmic ray promotion i.e. selective energization of matter in the cosmos requires, as on earth, three distinct stages: ionization, injection and acceleration to high energy. Supernova remnants and stellar winds of massive stars grouped in associations appear to be excellent celestial accelerators or re-accelerators through the shock waves they induce in their superbubbles. The injection of ions seems devoted to stars, except the smaller ones. In cosmic several mechanisms lead charged particle acceleration. Electrons are accelerated in direction of Earth’s poles by long train of electric double layers of small amplitudes. Charged particles are accelerated by the pondermotive force of electromagnetic radiation. Also, in a nonequilibrium current plasma or a plasma with particle flows, a strong electric double layer can be formed, which accelerates charged particles to high energies. The reconnection of\u0000the magnetic field lines also leads to the acceleration of charged particles.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90026878","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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