The paper considers the process of excitation of a wakefield in a plasma by a laser pulse. The plasma density corresponds to the density of free electrons in the metal. A method is demonstrated for keeping self-injected bunch in the accelerating phase of the wakefield as laser pulse and bunch move in plasma with an increasing density gradient. Thus, the rate of acceleration of self-injected bunch is maintained and enhanced.
{"title":"A METHOD FOR MAINTAINING THE ACCELERATION RATE AND INCREASING THE ENERGY OF SELF-INJECTED BUNCH DUE TO THE USE OF INHOMOGENEOUS PLASMA","authors":"D. Bondar, V. Maslov, I. Onishchenko","doi":"10.46813/2023-146-067","DOIUrl":"https://doi.org/10.46813/2023-146-067","url":null,"abstract":"The paper considers the process of excitation of a wakefield in a plasma by a laser pulse. The plasma density corresponds to the density of free electrons in the metal. A method is demonstrated for keeping self-injected bunch in the accelerating phase of the wakefield as laser pulse and bunch move in plasma with an increasing density gradient. Thus, the rate of acceleration of self-injected bunch is maintained and enhanced.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"56 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75222334","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 exact solution of the equation for the frequency of parametric X-ray radiation (PXR) of relativistic charged particles moving in a crystal is obtained and compared to the approximate solution. It is found that the exact solution is in good agreement with the approximate one and that the approximate PXR frequency solution is practically correct for a comparison to experimental data.
{"title":"FREQUENCY OF PARAMETRIC X-RAY RADIATION","authors":"A. V. Shchagin, G. Kube","doi":"10.46813/2023-146-085","DOIUrl":"https://doi.org/10.46813/2023-146-085","url":null,"abstract":"The exact solution of the equation for the frequency of parametric X-ray radiation (PXR) of relativistic charged particles moving in a crystal is obtained and compared to the approximate solution. It is found that the exact solution is in good agreement with the approximate one and that the approximate PXR frequency solution is practically correct for a comparison to experimental data.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"34 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73644480","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}
O. Manuilenko, V. Novikov, A. Pashchenko, I. Pashchenko, I. Shapoval, V. Yuferov
A system of the hydrodynamic equations describing the electron flows in a diode with a virtual cathode is considered. Collisions are considered by introducing the corresponding braking force into the equations of motion. The stationary states of the electron flows are described. In a linear approximation, formulas are obtained for the frequencies of electron oscillations in a diode with a virtual cathode, considering the effective frequency of electron collisions. The expression for the decrement of oscillations due to the presence of collisions is obtained.
{"title":"EFFECT OF ELECTRON COLLISIONS WITH RESIDUAL NEUTRAL GAS ON CHARACTERISTIC OSCILLATION FREQUENCIES IN SYSTEMS OF ELECTRON FLOWS WITH A VIRTUAL CATHODE","authors":"O. Manuilenko, V. Novikov, A. Pashchenko, I. Pashchenko, I. Shapoval, V. Yuferov","doi":"10.46813/2023-146-033","DOIUrl":"https://doi.org/10.46813/2023-146-033","url":null,"abstract":"A system of the hydrodynamic equations describing the electron flows in a diode with a virtual cathode is considered. Collisions are considered by introducing the corresponding braking force into the equations of motion. The stationary states of the electron flows are described. In a linear approximation, formulas are obtained for the frequencies of electron oscillations in a diode with a virtual cathode, considering the effective frequency of electron collisions. The expression for the decrement of oscillations due to the presence of collisions is obtained.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"123 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85661924","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 effectiveness of plasma chemical technology in reducing the concentration of ethylene impurities in order to extend the shelf life of kiwifruit has been studied. Ethylene and mold were controlled by plasma treatment, which slowed the ripening of kiwifruit and significantly inhibited rotting. When storing kiwifruit using the plasma chemical system, the level of ethylene was twice lower than that measured in the control batch. Also, the level of ethylene practically did not change during the entire period of the experiment, since the ethylene released from the fruit was quickly oxidized by ozone. Air treatment of kiwifruit storage environment resulted in the fact that ripening mechanism was delayed and the loss of fruits during their further transportation and storage was almost completely prevented. Thus, high efficiency of plasma-chemical method for extending kiwifruit shelf life was shown as well as the prospects of its application. Storage period can be doubled while preserving the subtle aroma of fruits. The effectiveness of plasma chemical technology in reducing the concentration of ethylene impurities in order to extend the shelf life of kiwifruit has been studied. High efficiency of plasma-chemical method for extending kiwifruit shelf life was shown as well as the prospects of its application. Storage period can be doubled while preserving the subtle aroma of fruits.
{"title":"EFFECT OF PLASMA CHEMICAL OXIDATION OF ETHYLENE IMPURITIES ON THE EFFICIENCY OF KIWIFRUIT STORAGE","authors":"M. Yegorov, G. Taran, O.O. Zamuriev, P. Opalev","doi":"10.46813/2023-146-155","DOIUrl":"https://doi.org/10.46813/2023-146-155","url":null,"abstract":"The effectiveness of plasma chemical technology in reducing the concentration of ethylene impurities in order to extend the shelf life of kiwifruit has been studied. Ethylene and mold were controlled by plasma treatment, which slowed the ripening of kiwifruit and significantly inhibited rotting. When storing kiwifruit using the plasma chemical system, the level of ethylene was twice lower than that measured in the control batch. Also, the level of ethylene practically did not change during the entire period of the experiment, since the ethylene released from the fruit was quickly oxidized by ozone. Air treatment of kiwifruit storage environment resulted in the fact that ripening mechanism was delayed and the loss of fruits during their further transportation and storage was almost completely prevented. Thus, high efficiency of plasma-chemical method for extending kiwifruit shelf life was shown as well as the prospects of its application. Storage period can be doubled while preserving the subtle aroma of fruits. The effectiveness of plasma chemical technology in reducing the concentration of ethylene impurities in order to extend the shelf life of kiwifruit has been studied. High efficiency of plasma-chemical method for extending kiwifruit shelf life was shown as well as the prospects of its application. Storage period can be doubled while preserving the subtle aroma of fruits.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"49 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80538489","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 features of H– ion emission from gas-feed-free Penning-type ion source with metal hydride cathode have been studied in pulsating regime. The metal hydride cathode provided local injection of hydrogen in activated state and impacts on Penning discharge ability to emit H– ions in the longitudinal direction. For stimulation of pre-excited hydrogen desorption from metal hydride the voltage pulse (4.5 kV, τ ≈ 15 µs) was performed against the background constant voltage of 6 kV on the anode of the discharge. The H– ion current of about 0.2 mA was obtained.
{"title":"PENNING-TYPE H– ION SOURCE WITH METAL HYDRIDE CATHODE IN PULSATING REGIME","authors":"I. Sereda, Ya. O. Hrechko, N. Azarenkov","doi":"10.46813/2023-146-126","DOIUrl":"https://doi.org/10.46813/2023-146-126","url":null,"abstract":"The features of H– ion emission from gas-feed-free Penning-type ion source with metal hydride cathode have been studied in pulsating regime. The metal hydride cathode provided local injection of hydrogen in activated state and impacts on Penning discharge ability to emit H– ions in the longitudinal direction. For stimulation of pre-excited\u0000hydrogen desorption from metal hydride the voltage pulse (4.5 kV, τ ≈ 15 µs) was performed against the background constant voltage of 6 kV on the anode of the discharge. The H– ion current of about 0.2 mA was obtained.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"56 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79143626","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. O. Maikut, A. I. Kuzmichev, L. Tsybulsky, N. Shynkarenko
Physico-topological simulation of a transmission X-ray tube (TRT) with inductionally heated thermionic cathode is presented, taking into account physical properties of functional elements and their design. Modeling is based on physical fundamentals for vacuum electronics and electrodynamics using ComSol. The distributions of electromagnetic fields, currents, temperature, and trajectories of thermoelectrons were calculated. The analysis of electron trajectories made it possible to optimize TRT topology and design.
{"title":"THE PHYSICO-TOPOLOGICAL SIMULATION OF A TRANSMISSION X-RAY TUBE WITH INDUCTION HEATING OF THE CATHODE","authors":"S. O. Maikut, A. I. Kuzmichev, L. Tsybulsky, N. Shynkarenko","doi":"10.46813/2023-146-190","DOIUrl":"https://doi.org/10.46813/2023-146-190","url":null,"abstract":"Physico-topological simulation of a transmission X-ray tube (TRT) with inductionally heated thermionic cathode is presented, taking into account physical properties of functional elements and their design. Modeling is based on physical fundamentals for vacuum electronics and electrodynamics using ComSol. The distributions of electromagnetic fields, currents, temperature, and trajectories of thermoelectrons were calculated. The analysis of electron trajectories made it possible to optimize TRT topology and design.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"14 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89800602","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}
D. Vinnikov, V. Katrechko, O.M. Ozerov, V. Tkachev, S. Marchenko, V. Yuferov, O. Manuilenko
Optimal voltage values were established for plasma guns and the pulsed current generator providing maximum break current values. The current values were determined for the plasma jumper formation region. The optimal time delay between the triggering of the plasma guns and the pulsed current generator has been established. The beam current was measured in the region behind the vacuum diode and in the plasma jumper region. The ultimate current was determined for the available plant geometry.
{"title":"INFLUENCE OF THE ENERGY PARAMETERS OF THE PRIMARY CIRCUIT ON THE CURRENT CHARACTERISTICS OF THE DIN-2K ACCELERATOR","authors":"D. Vinnikov, V. Katrechko, O.M. Ozerov, V. Tkachev, S. Marchenko, V. Yuferov, O. Manuilenko","doi":"10.46813/2023-146-036","DOIUrl":"https://doi.org/10.46813/2023-146-036","url":null,"abstract":"Optimal voltage values were established for plasma guns and the pulsed current generator providing maximum break current values. The current values were determined for the plasma jumper formation region. The optimal time delay between the triggering of the plasma guns and the pulsed current generator has been established. The beam\u0000current was measured in the region behind the vacuum diode and in the plasma jumper region. The ultimate current was determined for the available plant geometry.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"7 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84360231","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}
G. Taran, B. Kadolin, M. O. Yaroshenko, B. T. Stegniĭ
A study was conducted to determine the fungicidal activity of a sanitary contaminant of feeds – representatives of the genus Aspergillus Mich. – species of Aspergillus flavus using the ozone treatment method, treatment with the composition of Ag and Cu nanoparticles and the combined effect of these methods. When studying the combined effect of ozone, NPAg and NPCu, it was found that at the concentration ratio of 100:100 μg/cm3, there was a fungicidal effect on museum strains of Aspergillus flavus test cultures, i.e., the combination with ozone enhanced the antifungal properties of nanocomplex.
{"title":"STUDY OF THE FUNGICIDAL PROPERTIES OF OZONE TREATMENT, Ag AND Cu NANOPARTICLES AND THEIR COMBINED ACTION ON THE MODEL OF SANITARY SIGNIFICANT MOLD SAPROPHYTE ASPERGILLUS FLAVUS","authors":"G. Taran, B. Kadolin, M. O. Yaroshenko, B. T. Stegniĭ","doi":"10.46813/2023-146-151","DOIUrl":"https://doi.org/10.46813/2023-146-151","url":null,"abstract":"A study was conducted to determine the fungicidal activity of a sanitary contaminant of feeds – representatives of the genus Aspergillus Mich. – species of Aspergillus flavus using the ozone treatment method, treatment with the composition of Ag and Cu nanoparticles and the combined effect of these methods. When studying the combined effect of ozone, NPAg and NPCu, it was found that at the concentration ratio of 100:100 μg/cm3, there was a fungicidal effect on museum strains of Aspergillus flavus test cultures, i.e., the combination with ozone enhanced the antifungal properties of nanocomplex.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"15 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88226396","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. Magda, V. Mukhin, V. Sinitsin, S. Karelin, O. Lebedenko, M. Volovenko, O. Rak
Effective methods are suggested for exciting gigahertz-range oscillations in coaxial lines that contain ferrite rings and isotropic material. Within the gyrotropic section, the primary pulsed waveform gets transformed from the TEM into a TM mode. Its further development is analyzed, following the results of real-life and numerical experiments. Special attention is paid to amplitude variations of the ТМ mode, owing to the nonlinear response of the ferrite.
{"title":"EXCITATION OF DURABLE VHF OSCILLATIONS IN FERRITE-FILLED COAXIAL LINES","authors":"I. Magda, V. Mukhin, V. Sinitsin, S. Karelin, O. Lebedenko, M. Volovenko, O. Rak","doi":"10.46813/2023-146-008","DOIUrl":"https://doi.org/10.46813/2023-146-008","url":null,"abstract":"Effective methods are suggested for exciting gigahertz-range oscillations in coaxial lines that contain ferrite rings and isotropic material. Within the gyrotropic section, the primary pulsed waveform gets transformed from the TEM into a TM mode. Its further development is analyzed, following the results of real-life and numerical experiments. Special attention is paid to amplitude variations of the ТМ mode, owing to the nonlinear response of the ferrite.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"41 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87021541","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. Maslov, M. Casse, O. Cheremnykh, A. Fomina, D. Grasso, R. Kholodov, O. Novak, R. Ovsiannikov
In the vicinity of the poles of the planets of the solar system, ordered crystals of vortices and intermittency are observed. The formation of vortex structures in the vicinity of the poles of the planets of the solar system is investigated. The conditions for the formation of vortexes are considered. A nonlinear equation was found describing the vortex dynamics and structures were studied.
{"title":"STRUCTURES OF VORTEXES NEAR THE POLES OF PLANETS OF THE SOLAR SYSTEM","authors":"V. Maslov, M. Casse, O. Cheremnykh, A. Fomina, D. Grasso, R. Kholodov, O. Novak, R. Ovsiannikov","doi":"10.46813/2023-146-113","DOIUrl":"https://doi.org/10.46813/2023-146-113","url":null,"abstract":"In the vicinity of the poles of the planets of the solar system, ordered crystals of vortices and intermittency are observed. The formation of vortex structures in the vicinity of the poles of the planets of the solar system is investigated. The conditions for the formation of vortexes are considered. A nonlinear equation was found describing the vortex dynamics and structures were studied.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"44 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86758737","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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