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REGULARIZATION OF WAKEFIELD IN A WEAKLY NONLINEAR REGIME 弱非线性状态下的唤醒场正则化
IF 0.2
Problems of Atomic Science and Technology Pub Date : 2023-12-12 DOI: 10.46813/2023-148-080
I.V. Demydenko
{"title":"REGULARIZATION OF WAKEFIELD IN A WEAKLY NONLINEAR REGIME","authors":"I.V. Demydenko","doi":"10.46813/2023-148-080","DOIUrl":"https://doi.org/10.46813/2023-148-080","url":null,"abstract":"In blowout regime of wakefield excitation, strong chaotization of wake occurs. However, for electron-positron colliders and X-ray microscopes, a weakly nonlinear regime is proposed with the formation of a regular short chain of bubbles. To increase the efficiency of the wakefield accelerator, it is necessary that not separate bunches participate. In this paper in 2D plane geometry, the dependence of the number of formed bubbles and their regularization on the degree of wake non-linearity and parameters: driver current, ion mobility, transverse plasma size and profile is studied. We will show that in a weakly nonlinear regime the regular chain of bubbles becomes longer.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"1 1‐2","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
GENERATION OF COMPENSATED ION-ELECTRON FLOW IN THE COMBINED MAGNETRON-ION-PLASMA SYSTEM 在磁控-离子-等离子体组合系统中产生补偿离子-电子流
IF 0.2
Problems of Atomic Science and Technology Pub Date : 2023-12-12 DOI: 10.46813/2023-148-090
A. Zykov, N. Yefymenko, S. Dudin, S. Yakovin, N. Azarenkov
{"title":"GENERATION OF COMPENSATED ION-ELECTRON FLOW IN THE COMBINED MAGNETRON-ION-PLASMA SYSTEM","authors":"A. Zykov, N. Yefymenko, S. Dudin, S. Yakovin, N. Azarenkov","doi":"10.46813/2023-148-090","DOIUrl":"https://doi.org/10.46813/2023-148-090","url":null,"abstract":"The design and characteristics of the combined Magnetron-Ion-Plasma System (MIPS) are presented. The system includes a magnetron sputtering system and a Hall-type ion source with a common magnetic system and common power supply allowing the generation of quasi-neutral ion-electron flow, which provides complete charge neutralization on the processed dielectric surface. The formation of the anode electron layer and the energy spectra of ions are experimentally investigated. A phenomenological model of the combined discharge in EН fields is proposed. Theoretical calculations and experimental data are in reasonable agreement.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"38 4","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ISOLATION OF ELECTRONS BY THE MAGNETIC FIELDOF A CUSP FOR HIGH-DENSITY ION BEAM ACCELERATION 利用尖顶磁场隔离电子，实现高密度离子束加速
IF 0.2
Problems of Atomic Science and Technology Pub Date : 2023-12-12 DOI: 10.46813/2023-148-096
O. V. Fedorovskaya, V. Maslov, I. Onishchenko
{"title":"ISOLATION OF ELECTRONS BY THE MAGNETIC FIELD\u0000OF A CUSP FOR HIGH-DENSITY ION BEAM ACCELERATION","authors":"O. V. Fedorovskaya, V. Maslov, I. Onishchenko","doi":"10.46813/2023-148-096","DOIUrl":"https://doi.org/10.46813/2023-148-096","url":null,"abstract":"2.5D numerical simulation was carried out of the process of ions isolation from electrons of a compensated ion beam by the cusp magnetic field of the before entering the accelerating gap located in the region of zero magnetic field of the cusp, followed by the compensation of the accelerated ion beam with new electrons and transportation of\u0000the compensated ion beam to the next section of the linear induction ion accelerator. In contrast to the previously simulated compensated high-current ion beam with an energy of 250 keV (now non-existent), the equivalent plasma flow of a traditional coaxial plasma gun with real parameters: density 1010…1012 cm-3 and velocity 107 cm/s was\u0000considered as an injected compensated ion beam.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"49 151","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139007964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
STUDY THE ISOMERIC RATIOS IN PHOTONUCLEAR EXPERIMENTS ON THE LUE-40 LINAC RDC “ACCELERATOR” NSC KIPT 在 LUE-40 LINAC RDC "加速器 "NSC KIPT 上研究光核实验中的异构体比率
IF 0.2
Problems of Atomic Science and Technology Pub Date : 2023-11-06 DOI: 10.46813/2023-148-008
I. S. Timchenko, O. S. Deiev, S. Olejnik, S. Potin, V. Kushnir, V. Mytrochenko, S. Perezhogin
{"title":"STUDY THE ISOMERIC RATIOS IN PHOTONUCLEAR EXPERIMENTS ON THE LUE-40 LINAC RDC “ACCELERATOR” NSC KIPT","authors":"I. S. Timchenko, O. S. Deiev, S. Olejnik, S. Potin, V. Kushnir, V. Mytrochenko, S. Perezhogin","doi":"10.46813/2023-148-008","DOIUrl":"https://doi.org/10.46813/2023-148-008","url":null,"abstract":"The results of photoproduction of isomeric pairs from the (γ,xn) and (γ,pxn) reactions on nuclei from Zr up to Ta at the bremsstrahlung end-point energy range 30…100 MeV are systematized. Measurements were performed at the electron beam of the LUE-40 linac RDC “Accelerator” NSC KIPT using the activation method and off-line γ-ray spectrometric technique. The theoretical isomeric ratios IR for the nuclei-products of studied reactions were calculated using the cross-sections σ(E) from the TALYS1.95 code for six different level density models. The data from the international databases were additionally used to compare experimental results and theoretical predictions. The obtained results let us make conclusions about trends of values and energy dependence of IR in studied photonuclear reactions. Further directions of experimental research in the RDC “Accelerator” NSC KIPT are discussed.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"135 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139288252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
BEHAVIOUR OF MAGNESIUM POTASSIUM PHOSPHATE CEMENT UNDER LEACHING 磷酸镁钾水泥在浸出作用下的行为
Problems of Atomic Science and Technology Pub Date : 2023-10-12 DOI: 10.46813/2023-147-068
S.Y. Sayenko, V.A. Shkuropatenko, Y.O. Svitlychnyi, S.O. Karsim, D.V. Kutnii, A.V. Zykova, K.V. Lobach
{"title":"BEHAVIOUR OF MAGNESIUM POTASSIUM PHOSPHATE CEMENT UNDER LEACHING","authors":"S.Y. Sayenko, V.A. Shkuropatenko, Y.O. Svitlychnyi, S.O. Karsim, D.V. Kutnii, A.V. Zykova, K.V. Lobach","doi":"10.46813/2023-147-068","DOIUrl":"https://doi.org/10.46813/2023-147-068","url":null,"abstract":"The effectiveness of the use of magnesium potassium phosphate cements (MKPC) as protective matrices for radioactive waste was investigated in this work from the point of view of the main elements leaching. Fly ash and blast-furnace slag were used as MKPC fillers. Leaching tests were performed on monolithic MKPC samples according to ANSI/ANS 16.1 test. Based on the obtained data, the cumulative leaching fractions, leaching mechanisms, effective diffusion coefficients and leaching indices K, Mg, P, B, Si, Al, and Ca were determined. The values of the calculated leaching indices (>10) of the constituent elements indicate that the characteristics of the studied MKPC matrix are acceptable for radioactive waste immobilization.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
FEATURES OF MODIFICATIONS IN THE RE-SOLIDIFIED SURFACES OF ADVANCED MATERIALS DUE TO HIGH-POWER PLASMA PULSES 高能等离子体脉冲对先进材料再固化表面的影响
Problems of Atomic Science and Technology Pub Date : 2023-10-12 DOI: 10.46813/2023-147-015
S.S. Herashchenko, V.A. Makhlai, I.E. Garkusha, Yu.V. Petrov, N.N. Aksenov, N.V. Kulik, D.V. Yelisyeyev, P.B. Shevchuk, Y.E. Volkova, T.M. Merenkova, M. Wirtz
{"title":"FEATURES OF MODIFICATIONS IN THE RE-SOLIDIFIED SURFACES OF ADVANCED MATERIALS DUE TO HIGH-POWER PLASMA PULSES","authors":"S.S. Herashchenko, V.A. Makhlai, I.E. Garkusha, Yu.V. Petrov, N.N. Aksenov, N.V. Kulik, D.V. Yelisyeyev, P.B. Shevchuk, Y.E. Volkova, T.M. Merenkova, M. Wirtz","doi":"10.46813/2023-147-015","DOIUrl":"https://doi.org/10.46813/2023-147-015","url":null,"abstract":"The surface modification of advanced materials was studied through a series of repetitive plasma pulses caused tungsten melting. Features of the affected surface layers in reference materials (IGP W, AM W/WTa, Hastelloy, and EUROFER) for both fusion and fission applications were explored after exposure to plasma in the facilities (QSPA, MPC, and PPA) with different durations of plasma pulses. A detailed surface analysis was carried out with Scanning Electron Microscopy. It was found that the plasma treatment led to the formation of a modified layer as a result of the rapid re-solidification of the exposed surface. The fine cellular structures appeared in the re-solidified layers of the irradiated materials, with typical cell sizes ranging from 150 to 500 nm. An increase in the roughness of the exposed surfaces was attributed to the presence of the cracks and re-solidified layer.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DAMAGE TO THE HEAT EXCHANGE SURFACE OF STEAM GENERATOR PGV-1000 蒸汽发生器pgv-1000热交换面损坏
Problems of Atomic Science and Technology Pub Date : 2023-10-12 DOI: 10.46813/2023-147-091
S.V. Gozhenko, Y.O. Krainiuk, A.S. Mitrofanov
{"title":"DAMAGE TO THE HEAT EXCHANGE SURFACE OF STEAM GENERATOR PGV-1000","authors":"S.V. Gozhenko, Y.O. Krainiuk, A.S. Mitrofanov","doi":"10.46813/2023-147-091","DOIUrl":"https://doi.org/10.46813/2023-147-091","url":null,"abstract":"A comprehensive analysis of the damaged heat exchange surface of the PGV-1000 steam generator during long-term operation, their relationship with hydrodynamic, water-chemical regimes and surface properties was conducted. The methods of minimization of damages during the operation of Ukraine's NPP are considered.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EFFECT OF THERMOCHEMICAL TREATMENT ON THE Zr-1%Nb ALLOY CHARACTERISTICS 热化学处理对Zr-1%Nb合金性能的影响
Problems of Atomic Science and Technology Pub Date : 2023-10-12 DOI: 10.46813/2023-147-052
V.S. Trush, P.I. Stoev, M.A. Tikhonovsky, V.А. Panov, V.M. Fedirko, T.M. Tikhonovska, I.M. Pohrelyuk, A.G. Luk’yanenko, V.M. Korendiy, S.M. Lavrys
{"title":"EFFECT OF THERMOCHEMICAL TREATMENT ON THE Zr-1%Nb ALLOY CHARACTERISTICS","authors":"V.S. Trush, P.I. Stoev, M.A. Tikhonovsky, V.А. Panov, V.M. Fedirko, T.M. Tikhonovska, I.M. Pohrelyuk, A.G. Luk’yanenko, V.M. Korendiy, S.M. Lavrys","doi":"10.46813/2023-147-052","DOIUrl":"https://doi.org/10.46813/2023-147-052","url":null,"abstract":"Data on improving the characteristics of fuel rods made of the Zr-1%Nb alloy by modifying the near-surface layer are presented. For modification, thermochemical treatment (TCT) was used in a controlled gas environment based on the diffuse oxygen saturation of the near-surface layer. It was established that TCT does not reduce the mechanical characteristics of the Zr-1%Nb alloy compared to ones in the initial state, but in some cases increases its. The influence of different regimes of TCT on the features of oxidation in air and hydrogen saturation of the Zr-1%Nb alloy was considered. It was shown that the optimal regime of TCT provides a reduction in weight gain during oxidation at a temperature of 550 °C in the air for 100 h, and prevents saturation with hydrogen of Zr-1%Nb alloy. It was concluded that the TCT is a promising method for improving the performance of Zr-1%Nb alloy fuel rods.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SYNTHESIS, STRUCTURE AND PROTECTIVE PROPERTIES OF PVD MAX PHASE COATINGS. A REVIEW. PART I. MAX PHASE COATINGS DEPOSITION PVD Max相涂层的合成、结构及防护性能。复习一下。第一部分:最大相涂层沉积
Problems of Atomic Science and Technology Pub Date : 2023-10-12 DOI: 10.46813/2023-147-111
E.N. Reshetnyak, A.S. Kuprin, T.A. Prikhna, M.A. Bortnitskaya, V.A. Belous
{"title":"SYNTHESIS, STRUCTURE AND PROTECTIVE PROPERTIES OF PVD MAX PHASE COATINGS. A REVIEW. PART I. MAX PHASE COATINGS DEPOSITION","authors":"E.N. Reshetnyak, A.S. Kuprin, T.A. Prikhna, M.A. Bortnitskaya, V.A. Belous","doi":"10.46813/2023-147-111","DOIUrl":"https://doi.org/10.46813/2023-147-111","url":null,"abstract":"In recent decades, MAX phases have attracted considerable attention from the scientific community due to their unique combination of metallic and ceramic properties, which provide exceptional mechanical, thermal, electrical and chemical characteristics. The synthesis of MAX phases in the form of coatings is of increasing interest for many applications. The aim of this review is to summarize the progress made in the synthesis of coatings based on MAX phases using different methods. The advantages and characteristics of the implementation of ion-plasma physical vapor deposition methods are discussed. The use of ion-plasma methods allows to significantly reduce the synthesis temperature of MAX phases due to the high energy of the particles forming the coating. The effect of deposition parameters on the composition, structure and properties of the coatings is analyzed. Coatings with high protective properties and prospects for their application in industry are considered. This part of the review focuses on methods for depositing MAX phase based coatings.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RESEARCH INTO THE EFFECT OF PARTICLE SIZE DISTRIBUTION OF NEUTRON-ABSORBING POWDER MATERIALS ON THE COMPACTION IN ABSORBING ROD CLADDINGS 中子吸收粉末材料粒径分布对吸收棒包层压实效果的影响研究
Problems of Atomic Science and Technology Pub Date : 2023-10-12 DOI: 10.46813/2023-147-097
I.O. Chernov, M.M. Belash, V.O. Romankov, V.M. Yevseyev, Y.S. Legenkyi
{"title":"RESEARCH INTO THE EFFECT OF PARTICLE SIZE DISTRIBUTION OF NEUTRON-ABSORBING POWDER MATERIALS ON THE COMPACTION IN ABSORBING ROD CLADDINGS","authors":"I.O. Chernov, M.M. Belash, V.O. Romankov, V.M. Yevseyev, Y.S. Legenkyi","doi":"10.46813/2023-147-097","DOIUrl":"https://doi.org/10.46813/2023-147-097","url":null,"abstract":"The results of research into the effect of the granulometric compositions of neutron-absorbing powder materials such as boron carbide, dysprosium titanate and dysprosium hafnate and their mixtures in the initial state on the characteristics of backfills in the claddings of both “short” and full-size absorbing rods are presented. It was revealed that the achievement of the maximum backfill density is facilitated by providing the content of a fine fraction of about 30%. The maximum backfill density values achieved for boron carbide, dysprosium titanate, and dysprosium hafnate were 1.82, 5.1, and 5.82 g/cm3 respectively. The optimal modes of vibration compaction (type and frequency of oscillations), which ensure the achievement of the required values of the backfill density in absorbing rods in a short time were defined.","PeriodicalId":54580,"journal":{"name":"Problems of Atomic Science and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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