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Experimental results of the first ANET resolution campaign with the compact neutron collimator 紧凑中子准直器首次ANET分辨运动的实验结果
IF 1.1
Journal of Neutron Research Pub Date : 2022-08-17 DOI: 10.3233/jnr-220028
O. Sans-Planell, M. Costa, E. Durisi, E. Mafucci, L. Menzio, V. Monti, L. Visca, F. Grazzi, R. Bedogni, S. Altieri
{"title":"Experimental results of the first ANET resolution campaign with the compact neutron collimator","authors":"O. Sans-Planell, M. Costa, E. Durisi, E. Mafucci, L. Menzio, V. Monti, L. Visca, F. Grazzi, R. Bedogni, S. Altieri","doi":"10.3233/jnr-220028","DOIUrl":"https://doi.org/10.3233/jnr-220028","url":null,"abstract":"This paper presents the first determination of the improvement in beam divergence when including the ANET Compact Neutron Collimator on an existing thermal neutron beam, obtained with a measuring campaign at the LENA Mark-II TRIGA reactor in Pavia. This novel collimator consists of a sequence of collimating and absorbing channels organised in a chessboard-like geometry. It has a scalable structure both in length and in the field of view. It is characterized by an elevated collimation power within a limited length. Its scalability and compactness are added values with respect to traditional collimating system. The prototype tested in this article is composed of 4 concatenated stages, each 100 mm long, with a channel width of 2.5 mm, delivering a nominal L/D factor of 160. This measuring campaign illustrates the use of the ANET collimator and its potential application in ne","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44351219","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
Growing solid deuterium for UCN production 为UCN生产固体氘
IF 1.1
Journal of Neutron Research Pub Date : 2022-08-08 DOI: 10.3233/jnr-220010
E. Korobkina, I. Berkutov, R. Golub, P. Huffman, Clark Hickman, Kent Leung, G. Medlin, Matthew J. Morano, Thomas Rao, Cole Teander, C. White, A. Young
{"title":"Growing solid deuterium for UCN production","authors":"E. Korobkina, I. Berkutov, R. Golub, P. Huffman, Clark Hickman, Kent Leung, G. Medlin, Matthew J. Morano, Thomas Rao, Cole Teander, C. White, A. Young","doi":"10.3233/jnr-220010","DOIUrl":"https://doi.org/10.3233/jnr-220010","url":null,"abstract":"We have experimentally studied growing a large (about 1 liter) solid ortho-deuterium crystal in a real UCN source cryostat and recorded the growing process optically using a camera. The best quality was observed when growing the crystal directly from a vapor phase. The crystal was grown at different mass flows of deuterium and annealed at different temperatures. Optimum conditions were found for both, obtaining an optically transparent crystal and cooling it down with minimal damage. We found that the quality, final shape and changes during annealing of the crystal are very much dependent on the temperature profile of the cryostat walls.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43133807","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: 1
Mechanical DesignVerification for the moderated neutron source at SARAF SARAF慢化中子源的机械设计验证
IF 1.1
Journal of Neutron Research Pub Date : 2022-07-18 DOI: 10.3233/jnr-220017
T. Hirsh, Itay Horin, Lea Serraf, Ofek Sharon, O. Alon, Ron Raz, B. Shwartzman, U. Steinitz, D. Heflinger
{"title":"Mechanical DesignVerification for the moderated neutron source at SARAF","authors":"T. Hirsh, Itay Horin, Lea Serraf, Ofek Sharon, O. Alon, Ron Raz, B. Shwartzman, U. Steinitz, D. Heflinger","doi":"10.3233/jnr-220017","DOIUrl":"https://doi.org/10.3233/jnr-220017","url":null,"abstract":"The accelerator-driven thermal neutron source (TNS) at SARAF is under the advanced design stage, to provide an accelerator-based substitution to existing neutron imaging and diffraction utilities of the IRR1 aging research reactor. A challenging task of the system design is to provide a safe and maintainable coupling of 40 MeV deuteron beam and a 200 kW power liquid metal target with a compact light-water moderator and reflector assembly. The verification process of the mechanical design is performed through Monte-Carlo simulations over the detailed CAD models. We outline the method of verification of neutron production and safety requirements over the detailed system design and highlight the advantages of this approach.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46751291","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
Opportunities in the use of Very Cold Neutrons in reflectometry techniques 在反射技术中使用极冷中子的机会
IF 1.1
Journal of Neutron Research Pub Date : 2022-07-14 DOI: 10.3233/jnr-220004
F. Ott
{"title":"Opportunities in the use of Very Cold Neutrons in reflectometry techniques","authors":"F. Ott","doi":"10.3233/jnr-220004","DOIUrl":"https://doi.org/10.3233/jnr-220004","url":null,"abstract":"Reflectometry techniques are especially suited for time-of-flight measurements. The possibility of using longer wavelengths does not modify the physics probed during a reflectivity measurement. Besides, reflectometry measurements are not affected by effects such as multiple scattering or absorption. The use of longer wavelengths would permit to achieve instrumental gains due to the higher reflectivity. In the scattering plane, the phase space can be used more efficiently by a geometrical factor proportional to λ 2 provided by a simple increase of the incidence angles on the sample (for a given Q range). Perpendicular to the scattering plane, the neutron flux can be increased by a factor proportional to λ due to improved optics performances. However, the possibility of performing such measurements would be bound to the fact that the pulse structure or the instrument lengths are still adequate. This would require to proportionally decrease the instrument length or to either drop neutron frames. Both options are viable depending on the scientific goals and we show that the flux penalties are actually minimal. However, owing to the fact that the performances of reflectometry instrumentation at ESS is already expected to be extremely high, it is questionable if it is worth investing in VCN for this specific technique the more so as the implementation will not be optimal for extrinsic reasons. On the other hand, implementing VCN on sources such as CANS where the flux is intrinsically limited may be worth the investment since (i) such sources could probably be designed to use VCN in an optimal way, (ii) the implementation of VCN sources would be much easier as radiative heating would be reduced by several orders of magnitude, in the range of hundreds of watts, making the construction and handling of VCN sources a lot easier.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47544600","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: 1
The source for ultra-cold neutrons at the FRM II FRM II的超冷中子源
IF 1.1
Journal of Neutron Research Pub Date : 2022-07-07 DOI: 10.3233/jnr-220008
Andreas Frei
{"title":"The source for ultra-cold neutrons at the FRM II","authors":"Andreas Frei","doi":"10.3233/jnr-220008","DOIUrl":"https://doi.org/10.3233/jnr-220008","url":null,"abstract":"At the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) of the Technical University of Munich (TUM) a new source for ultra-cold neutrons (UCN) with a solid deuterium converter is currently under construction. This summary paper shall give an overview of the project and its current status. Research results concerning converter preparation, para-to-ortho conversion, radiation effects and neutron transport, which have been achieved in the last years, are presented and their relevance and transferability for the design of a future UCN source at the European Spallation Source (ESS) are discussed.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46694882","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: 1
Enabling In Situ Studies of Metal-Organic Chemical Vapor Deposition in a Transmission Electron Microscope. 利用透射电子显微镜对金属有机化学气相沉积进行现场研究。
IF 2.8
Journal of Neutron Research Pub Date : 2022-05-30 DOI: 10.1017/S1431927622000769
Marcus Tornberg, Carina B Maliakkal, Daniel Jacobsson, Reine Wallenberg, Kimberly A Dick
{"title":"Enabling <i>In Situ</i> Studies of Metal-Organic Chemical Vapor Deposition in a Transmission Electron Microscope.","authors":"Marcus Tornberg, Carina B Maliakkal, Daniel Jacobsson, Reine Wallenberg, Kimberly A Dick","doi":"10.1017/S1431927622000769","DOIUrl":"10.1017/S1431927622000769","url":null,"abstract":"<p><p>The world of environmental microscopy provides the possibility to study and analyze transformations and reactions during realistic conditions to understand the processes better. We report on the design and development of a metal-organic chemical vapor deposition (MOCVD) system integrated with an environmental transmission electron microscope intended for real-time investigations of crystal growth. We demonstrate methods for achieving a wide range of precisely controlled concentrations of precursor gas at the sample, as well as for calibrating the sample partial pressure using the pressure measured elsewhere in the microscope column. The influences of elevated temperature and reactive gas within the pole-piece gap are evaluated with respect to imaging and spectroscopy. We show that X-ray energy-dispersive spectroscopy can be strongly affected by temperatures beyond 500$^{circ }$C, while the spatial resolution is largely unaffected by heat and microscope pressure for the relevant conditions. Finally, the influence of the electron beam on the investigated processes is discussed. With this work, we aim to provide crucial input in the development of advanced in situ electron microscopy systems for studies of complex reactions in real time under realistic conditions, for instance as used during formation of semiconductor crystals.</p>","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":"1-9"},"PeriodicalIF":2.8,"publicationDate":"2022-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72552254","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
Guidelines for collaborative development of sustainable data treatment software 可持续数据处理软件协同开发指南
IF 1.1
Journal of Neutron Research Pub Date : 2022-03-22 DOI: 10.3233/jnr-220002
Joachim Wuttke, Stephen Cottrell, M. A. González, A. Kaestner, A. Markvardsen, T. Rod, Piotr B. Rozyczko, G. Vardanyan
{"title":"Guidelines for collaborative development of sustainable data treatment software","authors":"Joachim Wuttke, Stephen Cottrell, M. A. González, A. Kaestner, A. Markvardsen, T. Rod, Piotr B. Rozyczko, G. Vardanyan","doi":"10.3233/jnr-220002","DOIUrl":"https://doi.org/10.3233/jnr-220002","url":null,"abstract":"Software development for data reduction and analysis at large research facilities is increasingly professionalized, and internationally coordinated. To foster software quality and sustainability, and to facilitate collaboration, representatives from software groups of European neutron and muon facilities have agreed on a set of guidelines for development practices, infrastructure, and functional and non-functional product properties. These guidelines have been derived from actual practices in software projects from the EU funded consortium ‘Science and Innovation with Neutrons in Europe in 2020’ (SINE2020), and have been enriched through extensive literature review. Besides guiding the work of the professional software engineers in our computing groups, we hope to influence scientists who are willing to contribute their own data treatment software to our community. Moreover, this work may also provide inspiration to scientific software development beyond the neutron and muon field.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48714425","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: 1
Minimizing pressure inhomogeneities across large samples under helium pressure media at low temperatures 在低温氦气压力介质下最大限度地减少大样品的压力不均匀性
IF 1.1
Journal of Neutron Research Pub Date : 2022-03-21 DOI: 10.3233/jnr-210034
J. Leão
{"title":"Minimizing pressure inhomogeneities across large samples under helium pressure media at low temperatures","authors":"J. Leão","doi":"10.3233/jnr-210034","DOIUrl":"https://doi.org/10.3233/jnr-210034","url":null,"abstract":"When using gas pressure media to achieve hydrostatic pressure under a constant pressure and volume, passing through the melting curve ( P × T) of the gas to achieve low temperatures (1.5 K ⩽ T < 30 K) will cause an overall pressure reduction at base temperatures of at most 25 percent of the pressure read while under hydrostatic conditions at the P × T. In-situ inert gas high pressure vessels for neutron scattering for pressures of up to 1.0 GPa and temperatures as low as 1.5 K pose a particular problem due to the P × T phase diagram of the pressure media. A methodology for pressurization to ensure minimal pressure loss as temperature falls below the pressure media phase change, at the same time minimizing pressure inhomogeneity throughout the length of the sample; as well as calibration data are presented within this work.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093863","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
Properties of the dispersive double bent crystal monochromator setting with a multicrystal sandwich at the place of the second axis 第二轴处多晶夹层色散双弯晶单色仪的特性
IF 1.1
Journal of Neutron Research Pub Date : 2022-02-09 DOI: 10.3233/jnr-210032
P. Mikula, J. Šaroun, P. Strunz, V. Ryukhtin
{"title":"Properties of the dispersive double bent crystal monochromator setting with a multicrystal sandwich at the place of the second axis","authors":"P. Mikula, J. Šaroun, P. Strunz, V. Ryukhtin","doi":"10.3233/jnr-210032","DOIUrl":"https://doi.org/10.3233/jnr-210032","url":null,"abstract":"In this paper, some luminosity, focusing and resolution properties of a double-crystal (n,-m) dispersive setting which contains a bent perfect Si(111) crystal as a first one and a sandwich consisting of four different bent perfect crystals (BPC) Si(220), Si(400), Ge(111) and Ge(311) located at the second axis, is introduced with the aim of possible use in high-resolution diffractometry. The properties were investigated at a neutron wavelength of 0.162 nm. It was shown that a narrow and highly collimated and high-resolution monochromatic beam can be obtained. By using a standard polycrystalline pin of α-Fe, the resolution of the three-axis diffraction performance, namely, in the vicinity of the scattering angle 2 θ S = 90 ∘ was tested in detail. It has been found that the dispersive double-crystal (DC) setting represents a high-resolution monochromator alternative, e.g. in powder diffraction which could be used at high-flux neutron sources.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44622624","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
Exploring the use of neutrons to detect hydrogen embrittlement in high strength steel 利用中子检测高强度钢氢脆的探索
IF 1.1
Journal of Neutron Research Pub Date : 2021-12-09 DOI: 10.3233/jnr-210027
S. Roorda, Patrick Clancy, J. Bellemare, S. Laliberté-Riverin
{"title":"Exploring the use of neutrons to detect hydrogen embrittlement in high strength steel","authors":"S. Roorda, Patrick Clancy, J. Bellemare, S. Laliberté-Riverin","doi":"10.3233/jnr-210027","DOIUrl":"https://doi.org/10.3233/jnr-210027","url":null,"abstract":"With the aim of exploring neutron techniques for the non-destructive detection of hydrogen in embrittled steel, three sets of steel samples were studied with neutron scattering: Ni coated, Cd coated, and Cr coated. Each set contained a non-embrittled or low-hydrogen concentration reference and one or two embrittled and high-hydrogen concentration samples. It is observed that the incoherent scattering, when normalized by the intensity of the Bragg peak, is significantly higher for high-hydrogen concentration or embrittled samples than in the reference. Although the difference is small, this represents a non-destructive technique of detecting hydrogen embrittlement. Neutron radiography, and inelastic or small-angle scattering could not distinguish between embrittled and reference samples.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47245148","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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