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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 Q4 PHYSICS, NUCLEAR Pub Date : 2023-12-12 DOI: 10.46813/2023-148-080
I.V. Demydenko
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.
在唤醒场激发的井喷状态下,唤醒场会发生强烈的混沌化。然而,对于电子-正电子对撞机和 X 射线显微镜,提出了一种弱非线性机制,即形成规则的短气泡链。为了提高唤醒场加速器的效率,有必要让不独立的气泡串参与其中。本文在二维平面几何中研究了形成气泡的数量及其正则化对唤醒非线性程度和参数的依赖性:驱动电流、离子迁移率、横向等离子体尺寸和剖面 。我们将证明,在弱非线性状态下,规则气泡链会变得更长。
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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 Q4 PHYSICS, NUCLEAR Pub Date : 2023-12-12 DOI: 10.46813/2023-148-090
A. Zykov, N. Yefymenko, S. Dudin, S. Yakovin, N. Azarenkov
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.
介绍了磁控管-离子-等离子体组合系统(MIPS)的设计和特点。该系统包括一个磁控溅射系统和一个霍尔型离子源,具有共用磁系统和共用电源,可产生准中性离子-电子流,从而在处理过的电介质表面提供完全的电荷中和。实验研究了阳极电子层的形成和离子的能谱。提出了在 EН 场中的组合放电现象学模型。理论计算和实验数据非常吻合。
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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 Q4 PHYSICS, NUCLEAR Pub Date : 2023-12-12 DOI: 10.46813/2023-148-096
O. V. Fedorovskaya, V. Maslov, I. Onishchenko
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 ofthe 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 wasconsidered as an injected compensated ion beam.
在补偿离子束进入位于尖顶零磁场区域的加速间隙之前,对尖顶磁场从补偿离子束的电子中分离出离子的过程进行了 2.5D 数值模拟,随后用新电子对加速离子束进行补偿,并将补偿离子束输送到直线感应离子加速器的下一个部分。与之前模拟的能量为 250 keV 的补偿大电流离子束(现在已不存在)不同,传统同轴等离子枪的等效等离子流(实际参数:密度 1010...1012 cm-3,速度 107 cm/s)被视为注入的补偿离子束。
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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 Q4 PHYSICS, NUCLEAR 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
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.
系统分析了在轫致辐射端点能量范围 30...100 MeV 下,从 Zr 到 Ta 的原子核上发生的 (γ,xn) 和 (γ,pxn) 反应产生的异构体对的光生成结果。测量是在 LUE-40 直列加速器 RDC "加速器 "NSC KIPT 的电子束中进行的,采用的是活化法和离线 γ 射线光谱技术。使用 TALYS1.95 代码中的截面 σ(E),针对六种不同的水平密度模型,计算了所研究反应的核反应产物的理论异构体比 IR。此外,还使用了国际数据库中的数据来比较实验结果和理论预测。根据所获得的结果,我们可以对所研究的光核反应中红外值的趋势和能量依赖性做出结论。还讨论了在 RDC "加速器 "NSC KIPT 进行实验研究的进一步方向。
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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
Q4 PHYSICS, NUCLEAR 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
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.
从主元素浸出的角度研究了磷酸镁钾胶结剂(MKPC)作为放射性废物防护基质的有效性。采用粉煤灰和高炉矿渣作为MKPC填料。根据ANSI/ANS 16.1测试,对单片MKPC样品进行浸出试验。在此基础上,确定了K、Mg、P、B、Si、Al和Ca的累积浸出分数、浸出机制、有效扩散系数和浸出指标。计算出的各组成元素的浸出指数(>10)值表明,所研究的MKPC基质的特性可用于放射性废物的固定化。
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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
Q4 PHYSICS, NUCLEAR 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
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.
研究了通过一系列重复等离子体脉冲引起钨熔炼对先进材料进行表面改性的方法。在不同等离子体脉冲持续时间的设施(QSPA, MPC和PPA)中暴露于等离子体后,研究了用于聚变和裂变应用的参考材料(IGP W, AM W/WTa, Hastelloy和EUROFER)受影响的面层特征。用扫描电子显微镜进行了详细的表面分析。结果表明,等离子体处理可使暴露表面快速再凝固,从而形成改性层。辐照材料的再固化层中出现了细小的细胞结构,典型的细胞尺寸在150 ~ 500 nm之间。暴露表面粗糙度的增加归因于裂纹和再凝固层的存在。
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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
Q4 PHYSICS, NUCLEAR Pub Date : 2023-10-12 DOI: 10.46813/2023-147-091
S.V. Gozhenko, Y.O. Krainiuk, A.S. Mitrofanov
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.
综合分析了PGV-1000蒸汽发生器在长期运行过程中发生的换热面损伤,及其与水动力、水化学和表面性质的关系。考虑了乌克兰核电站运行过程中损害最小化的方法。
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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
Q4 PHYSICS, NUCLEAR 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
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.
本文介绍了通过改性Zr-1%Nb合金近表层来改善燃料棒性能的数据。在受控的气体环境下,根据近表层的弥漫性氧饱和度,采用热化学处理(TCT)进行改性。结果表明:与初始状态相比,TCT没有降低Zr-1%Nb合金的力学性能,但在某些情况下会提高其力学性能。研究了不同热处理制度对Zr-1%Nb合金空气氧化特性和氢饱和度的影响。结果表明,在550℃的空气中氧化100 h时,TCT的最佳处理方案可以减少重量增加,并防止Zr-1%Nb合金被氢饱和。结果表明,TCT是一种很有前途的提高Zr-1%Nb合金燃料棒性能的方法。
{"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
Q4 PHYSICS, NUCLEAR 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
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.
近几十年来,MAX相由于其独特的金属和陶瓷特性的结合,提供了卓越的机械、热、电和化学特性,引起了科学界的广泛关注。以涂层形式合成MAX相在许多应用中越来越受到关注。本文综述了不同方法合成MAX相涂料的研究进展。讨论了离子等离子体物理气相沉积方法的优点和特点。离子等离子体方法的使用可以显著降低MAX相的合成温度,因为形成涂层的粒子具有高能量。分析了沉积参数对镀层组成、结构和性能的影响。展望了具有高防护性能的涂料及其工业应用前景。本部分主要综述了沉积MAX相基涂层的方法。
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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
Q4 PHYSICS, NUCLEAR 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
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.
本文介绍了碳化硼、钛酸镝和铪酸镝等吸中子粉末材料的颗粒组成及其初始态混合物对“短”和全尺寸吸中子棒包覆层充填体特性的影响。结果表明,当细粒含量为30%左右时,有利于实现最大充填体密度。碳化硼、钛酸镝和铪酸镝的最大充填密度分别为1.82、5.1和5.82 g/cm3。确定了振动压实的最佳模式(振动类型和振动频率),以确保在短时间内达到吸振杆充填体密度的要求值。
{"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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Problems of Atomic Science and Technology
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