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Journal of Neutron Research最新文献

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The performance of neutron diffractometers at long and short pulse spallation sources: Comparison between ESS and J-PARC 中子衍射仪在长、短脉冲散裂源下的性能:ESS与J-PARC的比较
IF 1.1
Journal of Neutron Research Pub Date : 2021-11-22 DOI: 10.3233/jnr-200180
M. Arai, K. Andersen, D. Argyriou, W. Schweika, L. Zanini, S. Harjo, T. Kamiyama, M. Harada
{"title":"The performance of neutron diffractometers at long and short pulse spallation sources: Comparison between ESS and J-PARC","authors":"M. Arai, K. Andersen, D. Argyriou, W. Schweika, L. Zanini, S. Harjo, T. Kamiyama, M. Harada","doi":"10.3233/jnr-200180","DOIUrl":"https://doi.org/10.3233/jnr-200180","url":null,"abstract":"The general performance of diffractometers at the first long pulse spallation source ESS, is compared with their counterparts at J-PARC, a short pulse spallation source. The difference in the inherent pulse structure of these neutron sources presents opportunities for new concepts for instrumentation, where performance does not scale simply with source power. The article describes advantages and disadvantages of those diffractometers, adapting to the very different source characteristics. We find that the two sources offer comparable performance in flux and resolution when operating in high-resolution mode. ESS offers significant advantages in tunability and flexibility, notably in the ability to relax resolution in order to increase flux for a given experiment. The slow repetition rate of ESS favors long instruments. On the other hand, J-PARC instruments perform very well in spite of the lower source power and allow better access to epithermal neutrons, of particular interest for PDF analysis of diffraction data.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48221795","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
Resolution-intensity optimisation on quasielastic neutron scattering spectrometers 准弹性中子散射光谱仪的分辨率强度优化
IF 1.1
Journal of Neutron Research Pub Date : 2021-10-29 DOI: 10.3233/jnr-210029
R. Zorn
{"title":"Resolution-intensity optimisation on quasielastic neutron scattering spectrometers","authors":"R. Zorn","doi":"10.3233/jnr-210029","DOIUrl":"https://doi.org/10.3233/jnr-210029","url":null,"abstract":"In quasieleastic neutron scattering spectrometers one usually faces a trade-off between energy resolution and counting statistics. If the resolution is improved the intensity at the detectors reduces and vice versa. It is not immediately clear how to weigh both factors against each other. In this paper it is proposed to use the maximum time obtainable by Fourier transform of the spectra as the quantity to be optimised. It is shown that this leads to a well-defined criterion for the choice of the resolution.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48876070","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
Status of development and planning activities on CANS in Korea 韩国can的发展和规划活动现状
IF 1.1
Journal of Neutron Research Pub Date : 2021-09-27 DOI: 10.3233/jnr-210017
C. Lee, Myungkook Moon, Dong Won Lee, Han-sung Kim, H. Kwon, P. Lee, Donghyun Kim, Hyo Jung Seo, B. Hong, Hee-Seock Lee, M. Bakhtiari
{"title":"Status of development and planning activities on CANS in Korea","authors":"C. Lee, Myungkook Moon, Dong Won Lee, Han-sung Kim, H. Kwon, P. Lee, Donghyun Kim, Hyo Jung Seo, B. Hong, Hee-Seock Lee, M. Bakhtiari","doi":"10.3233/jnr-210017","DOIUrl":"https://doi.org/10.3233/jnr-210017","url":null,"abstract":"This report reviews the overall status of the development and planning activities of compact accelerator-based neutron sources in Korea. For the last decade, the demand for the technology development and application of CANS has significantly increased, and becomes widely accepted by the science, engineering and industry sectors. Since the first technical workshop focused on CANS under the support of the Korea Nuclear Society in fall 2016, there have been numerous efforts to launch projects by several groups. Although unsuccessful, two CANS projects were newly launched in 2020. One is the 30-MeV cyclotron-based neutron source for industrial neutron imaging at the Korea Atomic Energy Research Institute (KAERI), and the other is the BNCT technology development at the Korea Institute of Radiological & Medical Sciences. A project proposal for an expansion of the proton LINAC facility at KAERI to 200 MeV for semiconductor irradiation testing through the produced neutron field is now almost complete and will be submitted to the government funding agency for review. The CANS project for BNCT based on the proton LINAC developed by the Dawonsys consortium is briefly described. The new neutron source based on electron LINAC is prepared by the Pohang Light Source laboratory, and the initial consideration and application targets are also described. A new strategic plan for national R&D on radiation technology and the enforcement of its infrastructure is still under way, and a more systematic approach to the development and application of neutron sources will be implemented through the strategic planning.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43556122","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: 5
RIKEN Accelerator-driven compact Neutron systems, RANS project -RANS, RANS-II, III, RANS-μ- RIKEN加速器驱动紧凑型中子系统，RANS项目-RANS, RANS- ii, III, RANS-μ-
IF 1.1
Journal of Neutron Research Pub Date : 2021-09-27 DOI: 10.3233/jnr-210018
Y. Otake
{"title":"RIKEN Accelerator-driven compact Neutron systems, RANS project -RANS, RANS-II, III, RANS-μ-","authors":"Y. Otake","doi":"10.3233/jnr-210018","DOIUrl":"https://doi.org/10.3233/jnr-210018","url":null,"abstract":"RIKEN Accelerator-driven compact neutron source, RANS, has been operational since 2013. There are two major goals of RANS research and development. One is to establish a new compact low energy neutron non-destructive evaluation system on-site of floor-standing type for industrial use. Another goal is to invent a novel transportable compact neutron system for the preventive maintenance of large scale construction such as a bridge. For the realization of the preventive maintenance usage with neutron methods for non-destructive test of large scale structures on-site, “Standardization”, such as inclusion in manuals and inspection procedures, is essential. Technology research association for the infrastructure preventive maintenance standardization is established. RANS and RANS-II are in operation, and RANS-III, and RANS-μ, neutron salt-meter, are under development.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45502490","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
Conceptual design of the grazing-incidence focusing small-angle neutron scattering (gif-SANS) instrument at CPHS CPHS掠入射聚焦小角度中子散射（gif-SANS）仪器的概念设计
IF 1.1
Journal of Neutron Research Pub Date : 2021-09-07 DOI: 10.3233/jnr-210008
Huarui Wu, Weihang Hong, Yao Zhang, P. Bai, Wenbo Mo, Yigang Yang, H. Gong, Zhong Zhang, Xiufeng Xu, W. Cai, Ping Wang, Zhe Wang, Xuewu Wang
{"title":"Conceptual design of the grazing-incidence focusing small-angle neutron scattering (gif-SANS) instrument at CPHS","authors":"Huarui Wu, Weihang Hong, Yao Zhang, P. Bai, Wenbo Mo, Yigang Yang, H. Gong, Zhong Zhang, Xiufeng Xu, W. Cai, Ping Wang, Zhe Wang, Xuewu Wang","doi":"10.3233/jnr-210008","DOIUrl":"https://doi.org/10.3233/jnr-210008","url":null,"abstract":"Developing small-angle neutron scattering techniques at compact accelerator-driven neutron sources (CANS) is of great importance for expanding the user community and advancing CANS capability. At the Compact Pulsed Hadron Source (CPHS) at Tsinghua University, neutron-focusing mirrors are under intensive research to address the challenge. A grazing-incidence focusing SANS (gif-SANS) project is initialized. It employs a nested supermirror assembly with a large collecting area to achieve ⩾ 10 5 n/s neutron intensity at Q min ⩽ 0.007 Å − 1 . It will equip two detectors, one being a 3He detector for normal Q-range measurements, and the other being a high-resolution detector for extending the Q min down to 10 − 3 Å − 1 . In this work, we present the conceptual design of the gif-SANS at CPHS. Such a scheme is conducive to enable high-performance SANS measurements at CANS.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43863013","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
Tailoring neutron beam properties by target-moderator-reflector optimisation 通过目标慢化剂反射器优化定制中子束特性
IF 1.1
Journal of Neutron Research Pub Date : 2021-06-14 DOI: 10.3233/JNR-210016
P. Zakalek, Jingjing Li, S. Böhm, U. Rücker, J. Voigt, E. Mauerhofer, T. Gutberlet, T. Brückel
{"title":"Tailoring neutron beam properties by target-moderator-reflector optimisation","authors":"P. Zakalek, Jingjing Li, S. Böhm, U. Rücker, J. Voigt, E. Mauerhofer, T. Gutberlet, T. Brückel","doi":"10.3233/JNR-210016","DOIUrl":"https://doi.org/10.3233/JNR-210016","url":null,"abstract":"Compact accelerator-driven neutron sources allow to operate multiple optimised target-moderator-reflector (TMR) units adapted to the requirements of the respective instruments. The compact design of the TMR units allows an efficient coupling of neutron production, neutron moderation and extraction, but requires a novel way of optimisation. The neutronic performance of different TMR units based on polyethylene, heavy water and a mixture of heavy and light water moderators together with Pb and Be reflectors and a borated polyethylene absorber is discussed. Extraction channels for thermal and cold neutrons are investigated regarding the energy and time spectra.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":"1-16"},"PeriodicalIF":1.1,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-210016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45885368","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: 2
Conceptual study of salt-meter with 252Cf neutron source for on-site inspection of bridge structure 252Cf中子源盐计用于桥梁结构现场检测的概念研究
IF 1.1
Journal of Neutron Research Pub Date : 2021-06-09 DOI: 10.3233/JNR-210015
Y. Wakabayashi, M. Yan, M. Takamura, Ryuutarou Ooishi, Hiroshi Watase, Y. Ikeda, Y. Otake
{"title":"Conceptual study of salt-meter with 252Cf neutron source for on-site inspection of bridge structure","authors":"Y. Wakabayashi, M. Yan, M. Takamura, Ryuutarou Ooishi, Hiroshi Watase, Y. Ikeda, Y. Otake","doi":"10.3233/JNR-210015","DOIUrl":"https://doi.org/10.3233/JNR-210015","url":null,"abstract":"We studied the feasibility of a portable salt-meter incorporating a prompt gamma neutron activation analysis with a californium-252 neutron source to meet urgent demands for non-destructive methods without pre-processing in large bulk materials such as concrete structures. This technique is aiming at the chloride ion concentration in concrete structures with a depth profile from the surface to steel bar. From the portability point of view, a californium-252 neutron source is adopted and we have performed a preliminary experiment and simulations with a simple geometry. In this paper, we describe the performances of salt detection sensitivities by applying the prompt gamma neutron activation analysis.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":"1-7"},"PeriodicalIF":1.1,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-210015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44431574","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
Feasibility study of the transfer of the neutron resonance spin-echo spectrometer MUSES from continuous reactor to pulsed source 中子共振自旋回波谱仪MUSES从连续堆转移到脉冲源的可行性研究
IF 1.1
Journal of Neutron Research Pub Date : 2021-04-27 DOI: 10.3233/JNR-210003
S. Klimko, F. Legendre, S. Longeville
{"title":"Feasibility study of the transfer of the neutron resonance spin-echo spectrometer MUSES from continuous reactor to pulsed source","authors":"S. Klimko, F. Legendre, S. Longeville","doi":"10.3233/JNR-210003","DOIUrl":"https://doi.org/10.3233/JNR-210003","url":null,"abstract":"The Orphée reactor, located at the CEA Saclay near Paris, that was used to produce neutrons for scattering experiments over the past four decades has been stopped definitively in October 2019. The Laboratoire Léon Brillouin, the laboratory that operated the diffractometers and spectrometers around the Orphée reactor, is studying the possibility to build a compact Neutron Source to keep offering neutron beams to the French neutron scattering community. The efficient use of a pulsed source requires neutron instrumentation using Time-of-Flight (TOF) principles.The transfer of NSE spectrometer from continuous to pulse source requires the change of monochromatic neutron beam spin-echo technique to the TOF one. Here we report a successful attempt of adaptation of the Neutron Resonance Spin-Echo spectrometer MUSES (G1bis) to a pulsed source with a frequency of 20 Hz and a duty cycle of roughly 5 %.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":"1 1","pages":"1-15"},"PeriodicalIF":1.1,"publicationDate":"2021-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-210003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43447168","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
A prototype compact accelerator-based neutron source (CANS) for Canada 加拿大紧凑型加速器中子源(CANS)原型
IF 1.1
Journal of Neutron Research Pub Date : 2021-04-20 DOI: 10.3233/jnr-210012
R. Laxdal, D. Maharaj, M. Abbaslou, Z. Tun, D. Banks, A. Gottberg, M. Marchetto, Eduardo Rodríguez, Z. Yamani, H. Fritzsche, R. Rogge, M. Pan, O. Kester, D. Marquardt
{"title":"A prototype compact accelerator-based neutron source (CANS) for Canada","authors":"R. Laxdal, D. Maharaj, M. Abbaslou, Z. Tun, D. Banks, A. Gottberg, M. Marchetto, Eduardo Rodríguez, Z. Yamani, H. Fritzsche, R. Rogge, M. Pan, O. Kester, D. Marquardt","doi":"10.3233/jnr-210012","DOIUrl":"https://doi.org/10.3233/jnr-210012","url":null,"abstract":"Canada’s access to neutron beams for neutron scattering was significantly curtailed in 2018 with the closure of the National Research Universal (NRU) reactor in Chalk River, Ontario, Canada. New sources are needed for the long-term; otherwise, access will only become harder as the global supply shrinks. Compact Accelerator-based Neutron Sources (CANS) offer the possibility of an intense source of neutrons with a capital cost significantly lower than spallation sources. In this paper, we propose a CANS for Canada. The proposal is staged with the first stage offering a medium neutron flux, linear accelerator-based approach for neutron scattering that is also coupled with a boron neutron capture therapy (BNCT) station and a positron emission tomography (PET) isotope production station. The first stage will serve as a prototype for a second stage: a higher brightness, higher cost facility that could be viewed as a national centre for neutron applications.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44213025","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: 4
Development of neutron scattering kernels for cold neutron reflector materials 冷中子反射材料中子散射核的研制
IF 1.1
Journal of Neutron Research Pub Date : 2021-03-16 DOI: 10.3233/jnr-210013
J. Granada, J. I. M. Dami'an, J. Dawidowski, J. Robledo, C. Helman, G. Romanelli, Goran vSkoro
{"title":"Development of neutron scattering kernels for cold neutron reflector materials","authors":"J. Granada, J. I. M. Dami'an, J. Dawidowski, J. Robledo, C. Helman, G. Romanelli, Goran vSkoro","doi":"10.3233/jnr-210013","DOIUrl":"https://doi.org/10.3233/jnr-210013","url":null,"abstract":"The newest neutron scattering applications are highly intensity-limited techniques that demand reducing the neutron losses between source and detectors. In addition, the nuclear industry demands more accurate data and procedures for the design and optimization of advanced fission reactors, especially for the treatment of fuel and moderator materials. To meet these demands, it is necessary to improve the existing calculation tools, through the generation of better models that describe the interaction of neutrons with the systems of interest. The Neutron Physics Department at Centro Atomico Bariloche (CNEA, Argentina) has been developing over the time new models for the interaction of slow neutrons with materials, to produce scattering kernels and cross section data in the thermal and cold neutron energy region. Besides the studies carried out on neutron moderators, we have recently begun looking at materials that could serve as efficient neutron reflectors over those energy ranges. In this work we present the results of transmission and scattering experiments on diamond nanopowder and magnesium hydride, carried out simultaneously at the VESUVIO spectrometer (ISIS, UK), and compare them with newly generated cross-section libraries.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48523888","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: 4
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