Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques最新文献_第7页

Ion Beam Emittance Measurements of Proton Injector for Compact Neutron Source DARIA 用于紧凑型中子源 DARIA 的质子注入器的离子束发射率测量

IF 0.5

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701611

S. S. Vybin, I. V. Izotov, V. A. Skalyga, A. V. Polyakov, A. F. Bokhanov

{"title":"Ion Beam Emittance Measurements of Proton Injector for Compact Neutron Source DARIA","authors":"S. S. Vybin, I. V. Izotov, V. A. Skalyga, A. V. Polyakov, A. F. Bokhanov","doi":"10.1134/S1027451024701611","DOIUrl":"10.1134/S1027451024701611","url":null,"abstract":"This article is devoted to measurement of proton beam parameters as one of the stages of proton injector for linear accelerator of compact neutron source DARIA development. Experimental results of ion source operating modes investigation are presented in this work. Gasdynamic electron-cyclotron resonance ion source GISMO is used as a proton injector. The plasma of the ion source is characterized as dense (the electron density is about 1013 cm–3) and hot (the electron temperature is about 30 eV). High volumetric energy input in plasma (up to 250 W cm–3) is achieved by the use of powerful “technological” gyrotron radiation to the plasma heating. The total ion beam current and beam emittance measurements were conducted during experiment at different facility parameters: inlet gas pressure, microwave power, magnetic lens current, and extraction voltage. The beam emittance was measured using pepper-pot method. The optimal ion source operation mode was found. The total beam current was above 100 mA at the proton beam energy of 40 keV, and the root-mean square normalized emittance was 0.21 π mm mrad. The obtained results of measurements are beneficial from the point of view of possibilities to control the ion source operating modes.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1615 - 1622"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527641","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 Annealing on the Microstructure and Structural-Phase State of Nanoscale Multilayer Zr/Nb Coatings after Irradiation with He+ Ions 用 He+ 离子照射后退火对纳米级多层 Zr/Nb 涂层微观结构和结构相态的影响

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701404

R. S. Laptev, E. N. Stepanova, A. D. Lomygin, D. G. Krotkevich, A. A. Sidorin, O. S. Orlov

{"title":"Effect of Annealing on the Microstructure and Structural-Phase State of Nanoscale Multilayer Zr/Nb Coatings after Irradiation with He+ Ions","authors":"R. S. Laptev, E. N. Stepanova, A. D. Lomygin, D. G. Krotkevich, A. A. Sidorin, O. S. Orlov","doi":"10.1134/S1027451024701404","DOIUrl":"10.1134/S1027451024701404","url":null,"abstract":"Radiation degradation is a serious problem affecting the service life of many structural materials used in harsh environments. Modern research is aimed at developing materials with improved mechanical and physical properties, as well as increased resistance to radiation damage. Nanoscale multilayer coatings are one such material. The effect of annealing on the microstructure, defect structure, and mechanical properties of nanoscale multilayer materials consisting of alternating Zr and Nb layers after irradiation with He+ ions was studied. Multilayers Zr/Nb materials were prepared by magnetron sputtering, with the thickness of each layer being 50 nm. Analysis was performed using the following techniques: positron annihilation spectroscopy, X-ray diffraction analysis, and high-resolution transmission electron microscopy. Defects in the structure were investigated layer by layer using a variable energy positron beam and Doppler broadening spectroscopy. Analysis of changes in nanohardness, Young’s modulus, and structural-phase state has shown that the multilayer structure is preserved in Zr/Nb multilayers with a thicknesses of individual layer of 50 nm after irradiation with He+ ions and subsequent annealing in the range from 100 to 300°C.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1460 - 1465"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527649","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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Gd–Reference–Layer Method for the Case of Two Reflectometry Experiments

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701593

E. S. Nikova, Yu. A. Salamatov, E. A. Kravtsov

{"title":"Gd–Reference–Layer Method for the Case of Two Reflectometry Experiments","authors":"E. S. Nikova, Yu. A. Salamatov, E. A. Kravtsov","doi":"10.1134/S1027451024701593","DOIUrl":"10.1134/S1027451024701593","url":null,"abstract":"The article presents an approach to determining the modulus and phase of neutron reflection amplitude using a gadolinium reference layer, which allows reducing the number of necessary experiments from three to two. It is shown that it is possible to reconstruct the reflection amplitude based on the results of only two reflectometric experiments. However, when conducting two experiments, calculating the reflection amplitude is complicated by the fact that there will be two solutions instead of one. Therefore, it is necessary to evaluate the obtained results, since one of these solutions will have no physical meaning. The results are evaluated based on a priori information about the sample or with the help of additional modeling of the interaction potential. The theory of the proposed approach is described in detail, and it is tested on model numerical calculations for the Al2O3//Ti film. Experimental results for the test samples Al2O3//Nb and Si//Cr/Fe/Cr are presented. A comparison of the moduli and phases of the reflectivity obtained by processing three and two experiments is carried out. It was found that under conditions of poor statistics, conducting two experiments is preferable, since the solution, in this case, contains fewer artifacts of mathematical processing.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1595 - 1601"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527633","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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Multispectral Narrowband Terahertz Source Based on RbAP Molecular Crystal and a Tunable Metamaterial Filter

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701490

A. S. Sinko, N. N. Kozlova, V. L. Manomenova, E. B. Rudneva, A. E. Voloshin, N. E. Novikova, Ph. A. Kozhevnikov, M. R. Konnikova, A. P. Shkurinov

引用次数: 0

Aspects of Modeling a Tomography Experiment under Conditions of Polychromatic Radiation 多色辐射条件下的断层扫描实验建模问题

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701660

M. V. Grigoriev, Yu. S. Krivonosov, D. A. Zolotov, A. V. Buzmakov, V. E. Asadchikov

{"title":"Aspects of Modeling a Tomography Experiment under Conditions of Polychromatic Radiation","authors":"M. V. Grigoriev, Yu. S. Krivonosov, D. A. Zolotov, A. V. Buzmakov, V. E. Asadchikov","doi":"10.1134/S1027451024701660","DOIUrl":"10.1134/S1027451024701660","url":null,"abstract":"Modern tomographic studies using laboratory X-ray sources often employ the polychromatic mode due to the relatively low intensity of the radiation. This mode enhances the signal-to-noise ratio and improves the quality of the results of reconstruction. Modeling and analyzing the results of tomographic measurements with polychromatic X-ray radiation requires the consideration of additional aspects of the experiment compared to the monochromatic case. These aspects are related both to the spectral characteristics of the source and the interaction of polychromatic X-ray radiation with the sample and the detector. These aspects affect both the quantitative results of the simulation and interpretation of the reconstructed tomographic data. In this work, a simulation of a tomography experiment using silicon carbide samples and an aqueous solution of iohexol is performed. The influence of the X-ray tube radiation spectrum and the spectral sensitivity of the detector’s scintillator (charge-coupled device) made from various materials and thicknesses on the results of tomographic reconstruction is analyzed. Calculations are carried out both with and without consideration of these aspects. The results show that taking into account the spectral characteristics of the source and the peculiarities of the interaction between polychromatic radiation, the sample, and the detector improves the accuracy of simulating the tomography experiment.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1645 - 1655"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527583","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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Mechanical Properties of Zinc Alloy Zn–1Ag–1Cu Processed by Equal–Channel Angular Pressing and Extrusion 采用等通道角压和挤压工艺加工的锌合金 Zn-1Ag-1Cu 的机械性能

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701544

R. K. Nafikov, E. D. Khafizova, E. I. Fakhretdinova, M. V. Polenok, E. A. Korznikova

{"title":"Mechanical Properties of Zinc Alloy Zn–1Ag–1Cu Processed by Equal–Channel Angular Pressing and Extrusion","authors":"R. K. Nafikov, E. D. Khafizova, E. I. Fakhretdinova, M. V. Polenok, E. A. Korznikova","doi":"10.1134/S1027451024701544","DOIUrl":"10.1134/S1027451024701544","url":null,"abstract":"Zinc biodegradable alloys are actively researched as promising materials for creating biomedical implants for osteosynthesis and vascular stents. New zinc alloys of the Zn–Ag–Cu system are of particular interest due to their antimicrobial and bactericidal properties conferred by the addition of silver and copper. The feasibility of producing a defect-free zinc alloy spoke and the influence of combined processing, involving severe plastic deformation techniques, such as equal-channel angular pressing (ECAP) and extrusion, on the microstructural changes and mechanical properties of the Zn 1 wt % Ag 1 wt % Cu (Zn–1Ag–1Cu) alloy were studied. To complement the experimental study, computer modeling of the extrusion of the Zn–1Ag–1Cu alloy at a temperature of 150°C was performed. Data on the distribution of accumulated deformation and average stresses were obtained, indicating structural relaxation. Multipass ECAP treatment resulted in a significant grain refinement to 3 ± 0.5 μm compared to the homogenized state with a grain size of 326 ± 31 μm, while subsequent extrusion led to recrystallization. After combined processing, the average grain size increased to 13 ± 2 μm. Samples subjected to ECAP exhibited a substantial increase in ultimate strength to 204 MPa and ductility to 50%, compared to the homogenized state (78 MPa, 12%). However, extruded samples showed a slight decrease in strength to 181 MPa and ductility to 29%. It was concluded that the combined deformation techniques enable the production of a defect-free spoke with a diameter of 5 mm and a length of 200 mm, exhibiting mechanical properties suitable for medical applications.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1560 - 1569"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527640","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

Self-Forming Silicon Nitride Nanomask and Its Applications 自成型氮化硅纳米掩膜及其应用

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701246

V. K. Smirnov, D. S. Kibalov, P. A. Lepshin, I. V. Zhuravlev, G. F. Smirnova

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Migration of Chromium on the Silicon Oxide Surface under a Strong Electric Field

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701179

I. V. Uvarov, L. A. Mazaletskiy

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Design of Ion Beam Electrostatic Modulation System

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701635

D. M. Smagin, S. S. Vybin, I. V. Izotov, A. V. Polyakov, V. A. Skalyga

{"title":"Design of Ion Beam Electrostatic Modulation System","authors":"D. M. Smagin, S. S. Vybin, I. V. Izotov, A. V. Polyakov, V. A. Skalyga","doi":"10.1134/S1027451024701635","DOIUrl":"10.1134/S1027451024701635","url":null,"abstract":"This article is devoted to a stage of pulsed proton injector development which is conducted at the Gaponov-Grekhov Institute of Applied Physics, Russian Academy of Sciences. The result of electrostatic chopper numerical modeling is presented. It is a part of proton injector for linear accelerator of compact neutron source DARIA. A continuous wave mode gasdynamic electron cyclotron resonance ion source GISMO is used as an injector. The ion source has high volumetric energy input into plasma due to the use of “technological” gyrotron radiation to maintain and heat the plasma. The optimal geometric parameters (deflecting plates size and distance between them) of electrostatic chopper are determined during the calculations of proton beam propagation through the injector. The minimal voltage, which is enough for full beam deflection without losses inside chopper, is achieved at the optimal chopper geometry. Also, the output beam current dependence on chopper plate voltage is studied. The calculations allow for determining temporal characteristics of pulsed proton beam which escapes the injector at known pulse parameters of chopper voltage supply source.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1629 - 1633"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527580","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

Modification of the Tool Steel Surface with B4C–Al Powders under the Influence of Pulsed Laser 在脉冲激光的影响下用 B4C-Al 粉末对工具钢表面进行改性

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-03-01 DOI: 10.1134/S1027451024701556

A. B. Lupsanov, U. L. Mishigdorzhiyn, A. A. Mashanov, A. S. Milonov, A. V. Nomoev

{"title":"Modification of the Tool Steel Surface with B4C–Al Powders under the Influence of Pulsed Laser","authors":"A. B. Lupsanov, U. L. Mishigdorzhiyn, A. A. Mashanov, A. S. Milonov, A. V. Nomoev","doi":"10.1134/S1027451024701556","DOIUrl":"10.1134/S1027451024701556","url":null,"abstract":"The relevance of laser modification of the surface of metal parts is shown; experimental data are presented on the effect of surface treatment of tool steel 3Kh2V8F with a pulsed ytterbium fiber laser with the addition of a paste of B4C and B4C–Al powders. It is shown that a functional layer 30–40 μm thick with a microhardness of 1200–1400 HV and a surface roughness of the second class was obtained when processing the surface of the steel sample, on which a layer of paste 1–2 mm thick from F220 (B4C) powder was previously applied using glue, for 15 min with a laser at optimal operating mode settings. With a similar treatment, but with the addition of PA-4 (Al) powder to the powder F220 (B4C) in a ratio of 7 : 3, a functional layer 40–60 μm thick with a microhardness of 1100–1300 HV and a surface roughness of the seventh class was obtained. In the diffraction patterns of the modified surfaces of the samples, a more preferable Fe2B phase was detected; the FeB phase, which leads to a sharp embrittlement of the functional layer, was not identified.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 6","pages":"1570 - 1576"},"PeriodicalIF":0.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527632","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