The results of the analysis of the dynamics of charged particles under conditions of cyclotron resonances in the field of an intense electromagnetic wave are presented. Particular attention is paid to regimes with dynamic chaos. It is shown that there are two qualitatively different regimes. The appearance of the first one is due to the overlap of nonlinear cyclotron resonances. The second mode is related to intermittency. The moments and spectra of each of these regimes are determined. It is shown that with an increase in the intensity of an external electromagnetic wave, the first regime appears at the beginning and only then the second regime appears. A characteristic feature of the second regime is intermittency. Steps appear on the time dynamics of pulses in the second mode. It is shown that the spectra in the second mode are narrower than in the first mode. A characteristic feature of the second regime (the regime with intermittency) is the fact that the higher moments turn out to be larger than the lower moments. In the first regime, the highest moments decrease rapidly. To find the particle momentum distribution function, the generalized Fokker-Planck equation was used. Solutions of this equation are written out for some important cases.
{"title":"THE ROLE OF HIGHER MOMENTS ON THE DISTRIBUTION OF PARTICLES IN THE SPACE OF IMPULSES AT CYCLOTRON RESONANCES","authors":"V. Buts, V. Kuzmin","doi":"10.46813/2023-146-016","DOIUrl":"https://doi.org/10.46813/2023-146-016","url":null,"abstract":"The results of the analysis of the dynamics of charged particles under conditions of cyclotron resonances in the field of an intense electromagnetic wave are presented. Particular attention is paid to regimes with dynamic chaos. It is shown that there are two qualitatively different regimes. The appearance of the first one is due to the overlap of nonlinear cyclotron resonances. The second mode is related to intermittency. The moments and spectra of each of these regimes are determined. It is shown that with an increase in the intensity of an external electromagnetic wave, the first regime appears at the beginning and only then the second regime appears. A characteristic feature of the second regime is intermittency. Steps appear on the time dynamics of pulses in the second mode. It is shown that the spectra in the second mode are narrower than in the first mode. A characteristic feature of the second regime (the regime with intermittency) is the fact that the higher moments turn out to be larger than the lower moments. In the first regime, the highest moments decrease rapidly. To find the particle momentum distribution function, the generalized Fokker-Planck equation was used. Solutions of this equation are written out for some important cases.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"23 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73753883","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. Lisovskiy, S. Dudin, A. Shakhnazarian, P. Platonov, V. Yegorenkov
In this work, the axial profiles of the density of electrons and positive ions, the mean electron energy, the electric field strength, and the potential were obtained, both on average over the period and in dynamics. It was shown that argon discharges are dominated by ionization by electrons that gained energy by stochastic heating during the expansion of near-electrode sheaths. This ionization occurs in two pulses during one RF period. At low RF voltage between the electrodes, the role of Ohmic heating of electrons in the electric field in a quasi-neutral plasma increases, but the contribution of stochastic heating remains dominant. The time-averaged plasma potential was found to increase non-linearly with the RF voltage between the electrodes Urf. It is shown that at low Urf values (when the RF voltage approaches the discharge extinction curve), the average potential can reach Urf due to the axial redistribution of the instantaneous potential in the gap between the electrodes.
{"title":"SIMULATION OF CAPACITIVELY COUPLED RF DISCHARGE IN ARGON","authors":"V. Lisovskiy, S. Dudin, A. Shakhnazarian, P. Platonov, V. Yegorenkov","doi":"10.46813/2023-146-129","DOIUrl":"https://doi.org/10.46813/2023-146-129","url":null,"abstract":"In this work, the axial profiles of the density of electrons and positive ions, the mean electron energy, the electric field strength, and the potential were obtained, both on average over the period and in dynamics. It was shown that argon discharges are dominated by ionization by electrons that gained energy by stochastic heating during the expansion of near-electrode sheaths. This ionization occurs in two pulses during one RF period. At low RF voltage between the electrodes, the role of Ohmic heating of electrons in the electric field in a quasi-neutral plasma increases, but the contribution of stochastic heating remains dominant. The time-averaged plasma potential was found to\u0000increase non-linearly with the RF voltage between the electrodes Urf. It is shown that at low Urf values (when the RF voltage approaches the discharge extinction curve), the average potential can reach Urf due to the axial redistribution of the instantaneous potential in the gap between the electrodes.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"57 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83289077","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}
E. Frolova, V. Khomych, R. M. Kravchuk, O. Kolomys, Yu. M. Gudenko, O. Pylypchuk, V. Styopkin, A. Dobrovolskiy
The results of the treatment of TiO2 film in volume discharge with an Ar/H2 mixture are presented. The treated film demonstrates the changes in transparency and conductivity. Raman spectra show no changes in the phase state of the film after plasma treatment.
{"title":"PLASMA TREATMENT OF TITANIUM DIOXIDE FILM FOR BLACK TiO2","authors":"E. Frolova, V. Khomych, R. M. Kravchuk, O. Kolomys, Yu. M. Gudenko, O. Pylypchuk, V. Styopkin, A. Dobrovolskiy","doi":"10.46813/2023-146-180","DOIUrl":"https://doi.org/10.46813/2023-146-180","url":null,"abstract":"The results of the treatment of TiO2 film in volume discharge with an Ar/H2 mixture are presented. The treated film demonstrates the changes in transparency and conductivity. Raman spectra show no changes in the phase state of the film after plasma treatment.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"140 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80550915","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}
A. Linnik, G. Krivonosov, O. L. Omelayenko, G. Sotnikov
The paper presents several schemes for obtaining the main (witness) bunches from a long sequence of electron bunches, as well as from a part of a single electron bunch in the dielectric wakefield structure. The selected part of the electron bunches passes into the accelerating phase of the wake field due to the difference in the geometric path length between the separated electrons and the excited wakefield.
{"title":"SCHEMES FOR ACCELERATION A PART OF ELECTRONS OF DRIVE ELECTRON BUNCHES IN THE DIELECTRIC WAKEFIELD STRUCTURE","authors":"A. Linnik, G. Krivonosov, O. L. Omelayenko, G. Sotnikov","doi":"10.46813/2023-146-080","DOIUrl":"https://doi.org/10.46813/2023-146-080","url":null,"abstract":"The paper presents several schemes for obtaining the main (witness) bunches from a long sequence of electron bunches, as well as from a part of a single electron bunch in the dielectric wakefield structure. The selected part of the electron bunches passes into the accelerating phase of the wake field due to the difference in the geometric path length between the separated electrons and the excited wakefield.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"6 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88831250","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}
S. Donets, V. Bryukhovetsky, V. Lytvynenko, Y. Kasatkin, О. Startsev, Y. Lonin, A. Ponomarev, V. Т. Uvarov
Development of many innovative areas in energy, mechanical engineering, aircraft building and other industries is limited by the strength of materials under the action of temperature gradients. In this regard, the problem appears to find and justify technical means to model a complex of operating conditions. High-current relativistic electron beams reasonably belong to such instruments and means. As a result of their impact, pulsed electric and magnetic fields occur in the irradiated targets, temperature gradients are created, and shock waves are generated. The paper investigates the patterns of change in the internal structure of the blades of gas turbine engines and engineering materials, subjected to the action of an electron beam
{"title":"THE SIMULATION OF EMERGENCY ACTION ON CONSTRUCTION MATERIALS BY HIGH CURRENT RELATIVISTIC ELECTRON BEAMS","authors":"S. Donets, V. Bryukhovetsky, V. Lytvynenko, Y. Kasatkin, О. Startsev, Y. Lonin, A. Ponomarev, V. Т. Uvarov","doi":"10.46813/2023-146-170","DOIUrl":"https://doi.org/10.46813/2023-146-170","url":null,"abstract":"Development of many innovative areas in energy, mechanical engineering, aircraft building and other industries is limited by the strength of materials under the action of temperature gradients. In this regard, the problem appears to find and justify technical means to model a complex of operating conditions. High-current relativistic electron beams reasonably belong to such instruments and means. As a result of their impact, pulsed electric and magnetic fields occur in the irradiated targets, temperature gradients are created, and shock waves are generated. The paper investigates the patterns of change in the internal structure of the blades of gas turbine engines and engineering materials, subjected to the action of an electron beam","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":"87487245","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}
Numerical simulations of the negative corona in oxygen-containing gases under varying voltage are carried out. It is shown that by changing the values of constant voltage and duration of its application, between high voltage pulses, it is possible to control the electric field strength near the cathode, during the pulse. Quantitative characteristics of the ozone generation process are experimentally investigated. It is found that the agreed choice of the values of the constant component of the applied voltage and the frequency of the high voltage pulses can significantly increase the productivity and energy efficiency of ozone generators.
{"title":"STUDY OF THE DEPENDENCE OF THE CHARACTERISTICS OF THE PULSE NEGATIVE CORONA ON THE PARAMETERS OF THE COMBINED HIGH VOLTAGE POWER SUPPLY","authors":"G. Taran, B. Kadolin, V. Ostroushko, I. Paschenko","doi":"10.46813/2023-146-160","DOIUrl":"https://doi.org/10.46813/2023-146-160","url":null,"abstract":"Numerical simulations of the negative corona in oxygen-containing gases under varying voltage are carried out. It is shown that by changing the values of constant voltage and duration of its application, between high voltage pulses, it is possible to control the electric field strength near the cathode, during the pulse. Quantitative characteristics of the ozone generation process are experimentally investigated. It is found that the agreed choice of the values of the constant component of the applied voltage and the frequency of the high voltage pulses can significantly increase the productivity and energy efficiency of ozone generators.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"13 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80119577","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. Dikiy, N. Krasnoselskiy, Y. Lyashko, E. Medvedeva, D. Medvedev, V. Uvarov
Photonuclear technology for producing osteotropic isotopes 153Sm (Т1/2 = 1.9 days, Eβ = 0.8 MeV, Eγ = 103.2 keV), 175Yb (Т1/2 = 4.2 days, Eβ = 0.5 MeV, Eγ = 396.3 keV) and 186Re (T1/2 = 3.8 days, Eβ = 1.1 MeV, Eγ = 137.2 keV) with using nanoparticles (50…80 nm) of oxides of these elements and the Szilard-Chalmers reaction to increase specific activity have been developed at the NSC KIPT electron accelerator. Such medical isotopes are not produced in Ukraine. The overall electron accelerator isotope yield when bremsstrahlung irradiated these samples with a maximum energy of 40 MeV and a current of 250 µA for 186Re and 13.5 MeV and a current of 500 µA for 153Sm and 175Yb has been shown to have the advantages of higher specific activity, negligible the content of impurities and does not require immobilization of radioactive waste in comparison with a reactor and a cyclotron.
{"title":"POSSIBILITES OF ISOTOPES PRODUCTION OF 153Sm, 175Yb, 186Re AT THE ELECTRONIC ACCELERATOR","authors":"N. Dikiy, N. Krasnoselskiy, Y. Lyashko, E. Medvedeva, D. Medvedev, V. Uvarov","doi":"10.46813/2023-146-176","DOIUrl":"https://doi.org/10.46813/2023-146-176","url":null,"abstract":"Photonuclear technology for producing osteotropic isotopes 153Sm (Т1/2 = 1.9 days, Eβ = 0.8 MeV, Eγ = 103.2 keV), 175Yb (Т1/2 = 4.2 days, Eβ = 0.5 MeV, Eγ = 396.3 keV) and 186Re (T1/2 = 3.8 days, Eβ = 1.1 MeV, Eγ = 137.2 keV) with using nanoparticles (50…80 nm) of oxides of these elements and the Szilard-Chalmers reaction to increase specific activity have been developed at the NSC KIPT electron accelerator. Such medical isotopes\u0000are not produced in Ukraine. The overall electron accelerator isotope yield when bremsstrahlung irradiated these samples with a maximum energy of 40 MeV and a current of 250 µA for 186Re and 13.5 MeV and a current of 500 µA for 153Sm and 175Yb has been shown to have the advantages of higher specific activity, negligible the content of impurities and does not require immobilization of radioactive waste in comparison with a reactor and a cyclotron.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"153 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76734244","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. Leshchenko, A. Vasyliev, K. Galaydych, A. Povrozin, G. Sotnikov
This paper presents a theoretical study aimed at solving the problem of compensation for second and third order dispersion in CPA laser systems. We study the propagation of light pulses generated by a Ti-Sapphire master oscillator along the path of a stretcher-amplifiers-compressor. The wave equation and dispersion balance equations are used to analyze various Ti-Sapphire amplifier configurations. The research results include the values of the deviation of the compressor length and the angle of incidence of the light pulse on the input diffraction grating of the compressor. Different versions of amplifiers differ in the number of passes of a light pulse through Ti-Sapphire crystals and in the geometric profile of the crystals. The results obtained are presented in the Table. This research is essential for the development of more efficient CPA laser systems.
{"title":"SIMULTANEOUS COMPENSATION OF SECOND AND THIRD ORDER DISPERSION IN CPA LASER SYSTEMS","authors":"V. Leshchenko, A. Vasyliev, K. Galaydych, A. Povrozin, G. Sotnikov","doi":"10.46813/2023-146-041","DOIUrl":"https://doi.org/10.46813/2023-146-041","url":null,"abstract":"This paper presents a theoretical study aimed at solving the problem of compensation for second and third order dispersion in CPA laser systems. We study the propagation of light pulses generated by a Ti-Sapphire master oscillator along the path of a stretcher-amplifiers-compressor. The wave equation and dispersion balance equations are\u0000used to analyze various Ti-Sapphire amplifier configurations. The research results include the values of the deviation of the compressor length and the angle of incidence of the light pulse on the input diffraction grating of the compressor. Different versions of amplifiers differ in the number of passes of a light pulse through Ti-Sapphire crystals and in the geometric profile of the crystals. The results obtained are presented in the Table. This research is essential for the development of more efficient CPA laser systems.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"35 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75106197","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. Bazhenov, A. Dobrovolskiy, V. V. Tsiolko, V. M. Piun
The operation of a cylindrical plasma accelerator with an anode layer in the mode of ion space charge accumulation and the use of an ion flow accelerated by a space charge is investigated. In particular, the presence of highvoltage and diffusion modes with the formation of a secondary flow has been established. The output plasma flow current can reach 70% of the discharge current on the anode layer. The relationship between the connection scheme of the additional independent cathode and the plasma source parameters is shown.
{"title":"TWO STAGE PLASMA SOURCE FOR LARGE SCALE BEAM GENERATION","authors":"V. Bazhenov, A. Dobrovolskiy, V. V. Tsiolko, V. M. Piun","doi":"10.46813/2023-146-121","DOIUrl":"https://doi.org/10.46813/2023-146-121","url":null,"abstract":"The operation of a cylindrical plasma accelerator with an anode layer in the mode of ion space charge accumulation and the use of an ion flow accelerated by a space charge is investigated. In particular, the presence of highvoltage and diffusion modes with the formation of a secondary flow has been established. The output plasma flow\u0000current can reach 70% of the discharge current on the anode layer. The relationship between the connection scheme of the additional independent cathode and the plasma source parameters is shown.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"78 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78654104","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}
Electromagnetic surface waves in Voigt geometry are considered to resolve the contradiction between two classical studies. One investigated the waves at the boundary of two plasmas. These waves were reported not to propagate with frequencies below the ion cyclotron frequency. The other approach studied the waves at the metal-plasma interface. Dispersion properties of the waves with frequencies below the ion cyclotron frequency were investigated.
{"title":"DO THE DISPERSION PROPERTIES OF ELECTROMAGNETIC SURFACE WAVES AT THE SHARP BOUNDARY PLASMA-METAL IN SLAB VOIGT GEOMETRY REPRESENT THE LIMITING CASE OF THOSE FOR THE INTERFACE OF TWO PLASMAS?","authors":"I. Girka, M. Thumm","doi":"10.46813/2023-146-012","DOIUrl":"https://doi.org/10.46813/2023-146-012","url":null,"abstract":"Electromagnetic surface waves in Voigt geometry are considered to resolve the contradiction between two classical studies. One investigated the waves at the boundary of two plasmas. These waves were reported not to propagate with frequencies below the ion cyclotron frequency. The other approach studied the waves at the metal-plasma\u0000interface. Dispersion properties of the waves with frequencies below the ion cyclotron frequency were investigated.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"19 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72990379","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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