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
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.
{"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":null,"pages":null},"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}
P. Zakalek, Jingjing Li, S. Böhm, U. Rücker, J. Voigt, E. Mauerhofer, T. Gutberlet, T. Brückel
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.
{"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":null,"pages":null},"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}
Y. Wakabayashi, M. Yan, M. Takamura, Ryuutarou Ooishi, Hiroshi Watase, Y. Ikeda, Y. Otake
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.
{"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":null,"pages":null},"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}
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 %.
{"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":null,"pages":null},"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}
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
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.
{"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":null,"pages":null},"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}
J. Granada, J. I. M. Dami'an, J. Dawidowski, J. Robledo, C. Helman, G. Romanelli, Goran vSkoro
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.
{"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":null,"pages":null},"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}
Transport calculations for neutronic design require accurate nuclear data and validated computational tools. In the Spallation Physics Group, at the European Spallation Source, we perform shielding and neutron beam calculations to help the deployment of the instrument suite for the current high brilliance (top) moderator, as well for the design of the high intensity bottom moderator, currently under study for the facility. This work includes providing the best available nuclear data in addition to improving models and tools when necessary. In this paper we present the status of these activities, which include a set of thermal scattering kernels for moderator, reflector, and structural materials, the development of new kernels for beryllium considering crystallite size effects, nanodiamonds, liquid hydrogen and deuterium based on path integral molecular dynamics, and the use of the software package NCrystal to assist the development of nuclear data in the framework of the new HighNESS project.
{"title":"Nuclear data development at the European Spallation Source","authors":"J. Damián, D. Dijulio, G. Muhrer","doi":"10.3233/JNR-210014","DOIUrl":"https://doi.org/10.3233/JNR-210014","url":null,"abstract":"Transport calculations for neutronic design require accurate nuclear data and validated computational tools. In the Spallation Physics Group, at the European Spallation Source, we perform shielding and neutron beam calculations to help the deployment of the instrument suite for the current high brilliance (top) moderator, as well for the design of the high intensity bottom moderator, currently under study for the facility. This work includes providing the best available nuclear data in addition to improving models and tools when necessary. In this paper we present the status of these activities, which include a set of thermal scattering kernels for moderator, reflector, and structural materials, the development of new kernels for beryllium considering crystallite size effects, nanodiamonds, liquid hydrogen and deuterium based on path integral molecular dynamics, and the use of the software package NCrystal to assist the development of nuclear data in the framework of the new HighNESS project.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-210014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43002369","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}
This paper summarizes recent results of an exhaustive experimental study of multiple Bragg reflections accompanying allowed as well as forbidden reflections. The multiple reflection observations were carried out in the frame of Bragg diffraction optics experiments on cylindrically bent perfect single crystals. It has been found that depending on the thickness and curvature of the crystal slabs and the diffraction geometry (reflection, transmission), many strong multiple reflections can be excited which can also be used as a source of highly monochromatic and highly collimated beams for further experiments requiring extremely high resolution.
{"title":"Investigation of multiple Bragg reflections and their possible exploitation","authors":"P. Mikula, J. Šaroun, P. Strunz, V. Ryukhtin","doi":"10.3233/JNR-200185","DOIUrl":"https://doi.org/10.3233/JNR-200185","url":null,"abstract":"This paper summarizes recent results of an exhaustive experimental study of multiple Bragg reflections accompanying allowed as well as forbidden reflections. The multiple reflection observations were carried out in the frame of Bragg diffraction optics experiments on cylindrically bent perfect single crystals. It has been found that depending on the thickness and curvature of the crystal slabs and the diffraction geometry (reflection, transmission), many strong multiple reflections can be excited which can also be used as a source of highly monochromatic and highly collimated beams for further experiments requiring extremely high resolution.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/JNR-200185","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093038","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}
D. Aristov, S. Grigoriev, A. Syromyatnikov, A. Yashenkin
The outstanding physicist passed away on February, 20, 2021, a few months before his 90th anniversary. Sergey Vladimirovich Maleyev was born June 3, 1931, Yerevan. The World War II caught Sergey Maleyev in Leningrad. In December his family was evacuated from a sieged city in extremely malnourished condition. His father died during the evacuation. Sergey Maleyev graduated from high school in 1949 and entered the Faculty of Physics of Leningrad State University. Then he transferred to the Physics and Mathematics Faculty of Kharkov University and graduated from it in 1954. From 1954 to 1967 he worked at the Ioffe Physico-Technical Institute in Leningrad. In 1967, Sergey Vladimirovich organized the Department of solid-state theory, which he headed until 1997, and in which he worked until the end of his life. He earned a scientific degree of a Candidate of Sciences in Physics and Mathematics in 1958 and a Doctor of Sciences in 1974. The contribution of Sergey Maleyev to the development of national and world science cannot be overestimated. His works are widely known, their results having long become classics that went down in university textbooks. Among them there are:
{"title":"Sergey V. Maleyev (1931–2021)","authors":"D. Aristov, S. Grigoriev, A. Syromyatnikov, A. Yashenkin","doi":"10.3233/jnr-210020","DOIUrl":"https://doi.org/10.3233/jnr-210020","url":null,"abstract":"The outstanding physicist passed away on February, 20, 2021, a few months before his 90th anniversary. Sergey Vladimirovich Maleyev was born June 3, 1931, Yerevan. The World War II caught Sergey Maleyev in Leningrad. In December his family was evacuated from a sieged city in extremely malnourished condition. His father died during the evacuation. Sergey Maleyev graduated from high school in 1949 and entered the Faculty of Physics of Leningrad State University. Then he transferred to the Physics and Mathematics Faculty of Kharkov University and graduated from it in 1954. From 1954 to 1967 he worked at the Ioffe Physico-Technical Institute in Leningrad. In 1967, Sergey Vladimirovich organized the Department of solid-state theory, which he headed until 1997, and in which he worked until the end of his life. He earned a scientific degree of a Candidate of Sciences in Physics and Mathematics in 1958 and a Doctor of Sciences in 1974. The contribution of Sergey Maleyev to the development of national and world science cannot be overestimated. His works are widely known, their results having long become classics that went down in university textbooks. Among them there are:","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093611","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}
D. Baxter, T. Gutberlet, Y. Otake, F. Ott, Xuewu Wang
Compact accelerator-based neutron sources (CANS) represent a growing technology to provide neutrons in many areas of research and applications. Based on nuclear processes initiated by low energy proton or deuteron beams or the nuclear photo effect using electron beams, very compact neutron sources have been designed and installed at universities, research institutes, and industrial sites accross the globe. These small sources have provided continuous impact in fundamental nuclear physics as well as in material sciences, engineering, metrology or health. In most recent years partly driven by the advent of reactor based neutron sources and the desire for local and mobile neutron sources and partly by progress in high current proton accelerator systems, efforts are increasing to develop, design and construct very powerful CANS. One goal of these efforts is to provide future midand large-scale neutron sources complementary to spallation and reactor based sources, while another is to provide local services for industry or health e.g. as neutron imaging services or with boron neutron capture therapy to fight cancer. The Union for Compact Accelerator-driven Neutron Sources (UCANS) is organizing regular meetings to discuss the state of the art and developments on this topic. The UCANS9 conference was planned to be held in Wako, Japan in November 2020. Due to the global coronavirus outbreak the conference could not happen and was postponed to a future date in 2021. As an intermediate activity a web-based meeting was organized termed UCANS-web Conference and held from Nov. 30 to Dec. 3 2020 with a world-wide attendance of many scientists and researchers. The virtual conference covered a very wide range of topics on most aspects of compact sources, accelerators, targets, moderators, detectors, neutron scattering, radiography, isotope and nuclear data, medical applications as documented at the conference website (ucans-web.org). The diverse and varied presentations and discussions at this virtual meeting inspired the participants and organizers to publish presented work within a proceedings volume in the Journal of Neutron Research. The present contributions deal with basic nuclear data evaluation by improved scattering kernels, the development of versatile beam monitoring and multiplexing systems as well as the design and configuration of optimized target-moderator combinations to improve neutron flux. They further present novel instrumentation concepts and the plans and outlines for novel CANS facilities. Although these articles represent only a fraction of all of the presented contributions within the UCANS-web Conference, they demonstrate the progress and state-of-the-art in this fast-emerging field. Upcoming conferences, workshops and UCANS meetings will show further progress and developments and the present proceedings will support all these discussions and activities to develop and optimize CANS.
{"title":"Editorial Proc. UCANS-web Conference, Nov. 30–Dec. 3 2020","authors":"D. Baxter, T. Gutberlet, Y. Otake, F. Ott, Xuewu Wang","doi":"10.3233/jnr-210022","DOIUrl":"https://doi.org/10.3233/jnr-210022","url":null,"abstract":"Compact accelerator-based neutron sources (CANS) represent a growing technology to provide neutrons in many areas of research and applications. Based on nuclear processes initiated by low energy proton or deuteron beams or the nuclear photo effect using electron beams, very compact neutron sources have been designed and installed at universities, research institutes, and industrial sites accross the globe. These small sources have provided continuous impact in fundamental nuclear physics as well as in material sciences, engineering, metrology or health. In most recent years partly driven by the advent of reactor based neutron sources and the desire for local and mobile neutron sources and partly by progress in high current proton accelerator systems, efforts are increasing to develop, design and construct very powerful CANS. One goal of these efforts is to provide future midand large-scale neutron sources complementary to spallation and reactor based sources, while another is to provide local services for industry or health e.g. as neutron imaging services or with boron neutron capture therapy to fight cancer. The Union for Compact Accelerator-driven Neutron Sources (UCANS) is organizing regular meetings to discuss the state of the art and developments on this topic. The UCANS9 conference was planned to be held in Wako, Japan in November 2020. Due to the global coronavirus outbreak the conference could not happen and was postponed to a future date in 2021. As an intermediate activity a web-based meeting was organized termed UCANS-web Conference and held from Nov. 30 to Dec. 3 2020 with a world-wide attendance of many scientists and researchers. The virtual conference covered a very wide range of topics on most aspects of compact sources, accelerators, targets, moderators, detectors, neutron scattering, radiography, isotope and nuclear data, medical applications as documented at the conference website (ucans-web.org). The diverse and varied presentations and discussions at this virtual meeting inspired the participants and organizers to publish presented work within a proceedings volume in the Journal of Neutron Research. The present contributions deal with basic nuclear data evaluation by improved scattering kernels, the development of versatile beam monitoring and multiplexing systems as well as the design and configuration of optimized target-moderator combinations to improve neutron flux. They further present novel instrumentation concepts and the plans and outlines for novel CANS facilities. Although these articles represent only a fraction of all of the presented contributions within the UCANS-web Conference, they demonstrate the progress and state-of-the-art in this fast-emerging field. Upcoming conferences, workshops and UCANS meetings will show further progress and developments and the present proceedings will support all these discussions and activities to develop and optimize CANS.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/jnr-210022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70093795","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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