Journal of Neutron Research最新文献_第3页

Accelerator based epithermal neutron source for clinical boron neutron capture therapy 基于加速器的超热中子源用于临床硼中子俘获治疗

IF 1.1

Journal of Neutron Research Pub Date : 2022-12-08 DOI: 10.3233/jnr-220037

N. Hu, Hiroki Tanaka, K. Akita, R. Kakino, T. Aihara, K. Nihei, K. Ono

{"title":"Accelerator based epithermal neutron source for clinical boron neutron capture therapy","authors":"N. Hu, Hiroki Tanaka, K. Akita, R. Kakino, T. Aihara, K. Nihei, K. Ono","doi":"10.3233/jnr-220037","DOIUrl":"https://doi.org/10.3233/jnr-220037","url":null,"abstract":"The world’s first accelerator based epithermal neutron source for clinical boron neutron capture therapy (BNCT) was designed, developed, and commissioned between 2008 and 2010 by Sumitomo Heavy Industries in collaboration with Kyoto University at the Kyoto University Institute for Integrated Radiation and Nuclear Science. The accelerator system is cyclotron-based and accelerates a proton up to an energy of approximately 30 MeV. The proton strikes a beryllium target, which produces fast neutrons that traverse a beam shaping assembly composed of a combination of lead, iron, aluminum, and calcium fluoride to reduce the neutron energy down to the epithermal range (∼10 keV) suitable for BNCT. The system is designed to produce an epithermal neutron flux of up to 1.4 × 10 9 n · cm − 2 · s − 1 (exiting from the moderator of a 12 cm diameter collimator) with a proton current of 1 mA. In 2017, the same type of accelerator was installed at the Kansai BNCT Medical Center and in March 2020 the system received medical device approval in Japan (Sumitomo Heavy Industries, NeuCure® BNCT system). Soon after, BNCT for unresectable, locally advanced, and recurrent carcinoma of the head and neck region was approved by the Japanese government for reimbursement covered by the national health insurance system.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46142117","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

Decay heat in ISIS spallation target: simulations and measurements ISIS散裂靶的衰变热:模拟与测量

IF 1.1

Journal of Neutron Research Pub Date : 2022-12-01 DOI: 10.3233/jnr-220030

L. Quintieri, S. Lilley, D. Wilcox, D. Findlay, D. Jenkins, S. Gallimore, D. Haynes

{"title":"Decay heat in ISIS spallation target: simulations and measurements","authors":"L. Quintieri, S. Lilley, D. Wilcox, D. Findlay, D. Jenkins, S. Gallimore, D. Haynes","doi":"10.3233/jnr-220030","DOIUrl":"https://doi.org/10.3233/jnr-220030","url":null,"abstract":"Spallation targets for neutron production with high energy protons are made of high density and high atomic number materials in order to maximise the yield of neutrons for all the instruments around. Operating a proton beam onto a spallation target produces residual radioactive nuclei either as direct product of the spallation process and as secondary low energy neutron absorption. A reliable estimation of the overall activation and decay heat, as a function of the cooling time and irradiation profile history, is fundamental for a valuable design of the radiation shielding and cooling system during the operation phase as well for envisaging the optimal storage solution at the end of life of the target. This work presents the comparison between the FLUKA predictions of the decay heat in the ISIS TS1 target operated between 2014 and 2019 and the decay heat estimations derived from the measurement of the temperature in each plate at different cooling times. The agreement between the FLUKA predictions and the experimentally assessed values shows and quantifies the goodness of the FLUKA model in predicting measurable physical quantities relevant for the engineering thermal design of the target/reflector and moderator (TRAM) assembly. In addition, it also provides an indirect evidence of the accuracy of the simulated spallation physics and neutron transport throughout the TRAM assembly. Finally this work attempts to highlight and propose a general empirical procedure that could be eventually applied and used to proficiently measure the decay heat at whatever cooling time in targets with similar ISIS design.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46299168","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

Very cold and ultra cold neutron sources for ESS 极冷和超冷中子源用于ESS

IF 1.1

Journal of Neutron Research Pub Date : 2022-11-28 DOI: 10.3233/jnr-220040

L. Zanini, E. Dian, D. Dijulio, B. Folsom, E. Klinkby, Z. Kókai, J. I. Marquez Damian, B. Rataj, N. Rizzi, V. Santoro, M. Strothmann, A. Takibayev, R. Wagner, O. Zimmer

{"title":"Very cold and ultra cold neutron sources for ESS","authors":"L. Zanini, E. Dian, D. Dijulio, B. Folsom, E. Klinkby, Z. Kókai, J. I. Marquez Damian, B. Rataj, N. Rizzi, V. Santoro, M. Strothmann, A. Takibayev, R. Wagner, O. Zimmer","doi":"10.3233/jnr-220040","DOIUrl":"https://doi.org/10.3233/jnr-220040","url":null,"abstract":"The goal of the “Workshop on Very Cold and Ultra Cold Neutron Sources for ESS” was to discuss scientific cases, ideas and possibilities for the implementation of sources of Very Cold and Ultra Cold neutrons at the European Spallation Source. The ESS facility, presently under construction, offers several possibilities for in-pile UCN or VCN sources, in primis thanks to the available space below the spallation target where additional neutron sources can be placed to complement those above the target. Neutron beams can be extracted over a wide angular range with a grid of forty-two beamports with 6° average angular separation, allowing future instruments to be installed which may view either the upper or lower moderator systems. Of greatest interest for fundamental physics is the so-called Large Beamport foreseen for the NNBAR experiment. This beamport is also particularly well suited to feed a UCN source, for which several ideas were presented that employ either superfluid helium or solid deuterium as established neutron converter materials. Concepts for VCN sources make use of novel materials for VCN production and/or advanced reflectors to increase yields in the coldest part of the neutron spectrum from a cryogenic neutron source. In this paper we discuss these ideas and the possible locations of UCN and VCN sources at ESS.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46736503","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

Target cooling options for DARIA compact neutron source DARIA紧凑型中子源的目标冷却选择

IF 1.1

Journal of Neutron Research Pub Date : 2022-11-25 DOI: 10.3233/jnr-220025

A. R. Moroz, N. Kovalenko, S. Grigoriev

引用次数: 0

Sample-motion-synchronized neutron stroboscope at RANS RANS的样品运动同步中子频闪仪

IF 1.1

Journal of Neutron Research Pub Date : 2022-10-26 DOI: 10.3233/jnr-220035

A. Taketani, Takaoki Takanashi, C. Iwamoto, Tomohiro Kobayashi, Masato Takamura

引用次数: 0

The ESS Monolith Vessel design and possibilities to introduce a UCN/VCN source ESS单片容器的设计和引入UCN/VCN源的可能性

IF 1.1

Journal of Neutron Research Pub Date : 2022-10-21 DOI: 10.3233/jnr-220014

U. Odén

{"title":"The ESS Monolith Vessel design and possibilities to introduce a UCN/VCN source","authors":"U. Odén","doi":"10.3233/jnr-220014","DOIUrl":"https://doi.org/10.3233/jnr-220014","url":null,"abstract":"The ESS ERIC neutron source design includes a helium cooled tungsten spallation target and a liquid hydrogen moderator, enclosed in a vacuum vessel (the monolith vessel – spallation source vacuum chamber). The neutron source and moderator are shielded by stainless steel and casted iron to block neutron and gamma radiation emitted in directions outside of the neutron guide lines. After the ESS concept design was approved, discussions were raised if it was possible to introduce a UCN/VCN (Ultra Cold Neutron / Very Cold Neutron) source into the ESS design. Since the shielding concept of the monolith vessel is to 100% fill the monolith void, outside of the proton and neutron path, there are no cavities in the monolith vessel to easily introduce an UCN/VCN source. In addition, pipe routing supporting the UCN/VCN cooling media, will also challenge the possible UCN/VCN positions. However, some of the shielding blocks and monolith components are removable and could possibly be redesigned, enabling a UCN/VCN source feature. The article presents a feasibility study how to physically introduce a UCN/VCN source in the present ESS design, and focus on the geometrical possibilities. Four possible locations for the UCN/VCN source are identified and presented in the article. The locations are selected considered reasonable impact to the existing design. Pros and cons are discussed. All of the four presented locations are feasible but will, to some extent, require redesign of the monolith vessel shielding.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44199419","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

Development of UCN sources at PNPI PNPI的UCN源开发

IF 1.1

Journal of Neutron Research Pub Date : 2022-10-19 DOI: 10.3233/jnr-220007

A. Serebrov, Vitaliy Lyamkin

{"title":"Development of UCN sources at PNPI","authors":"A. Serebrov, Vitaliy Lyamkin","doi":"10.3233/jnr-220007","DOIUrl":"https://doi.org/10.3233/jnr-220007","url":null,"abstract":"This article reviews the development of various sources for ultracold neutrons (UCNs) at the Petersburg Nuclear Physics Institute (PNPI). For 45 years, PNPI has proposed and manufactured cryogenic devices for neutron conversion to low energies. Based on beryllium, hydrogen and deuterium, they can be operated in the intense radiation fields near the core of a nuclear reactor. A more recently launched UCN source development utilizes superfluid helium (He-II) as conversion medium. Initially proposed and designed for PNPI’s old WWR-M reactor, the project has been reshaped to equip the institute’s PIK reactor with a modern UCN source of this type. The projected UCN density in the closed source chamber is 2.2 × 103 cm−3, which, as calculations of neutron transport show, will provide 200 cm−3 in the chambers of a neutron EDM spectrometer connected to the source by a UCN guide. Experiments at PNPI with a full-scale UCN source model have demonstrated that a heat load of 60 W can be removed from the He-II in the converter at a temperature of 1.37 K. This fact confirms the practical possibility to implement low-temperature converters under “in-pile” conditions with large heat inflows. The review concludes with a presentation of various proposed options for a He-II based UCN source at the European Spallation Source.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44082456","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

Simulation and design of an IPHI-based neutron source, first steps toward SONATE 基于IPHI的中子源的模拟和设计，迈向SONATE的第一步

IF 1.1

Journal of Neutron Research Pub Date : 2022-10-18 DOI: 10.3233/jnr-220027

B. Mom, L. Thulliez, Eric Dumonteil, M. Binois, Y. Richet, J. Schwindling, A. Drouart

{"title":"Simulation and design of an IPHI-based neutron source, first steps toward SONATE","authors":"B. Mom, L. Thulliez, Eric Dumonteil, M. Binois, Y. Richet, J. Schwindling, A. Drouart","doi":"10.3233/jnr-220027","DOIUrl":"https://doi.org/10.3233/jnr-220027","url":null,"abstract":"Facilities providing bright thermal neutron beams are of primary importance for various research topics. At CEA-Saclay, a compact accelerator driven neutron source, SONATE, is investigated in taking advantage of the IPHI accelerator able to deliver a 3 MeV proton beam with an intensity up to 100 mA. To optimize the performances of such a neutron source, it is necessary to maximize the thermal neutron flux while minimizing the contribution of other particles. In this work, optimization has been performed using the Monte Carlo code TOUCANS, a neutron transport code based on Geant4 developed at CEA-Saclay. This latter has been coupled to PROMETHEE, a software allowing multi-objective optimization for many simulation software. In this work the Kriging metamodel based approach is used to optimize a neutron beamdump. To take into account the various constraints, noise on the detection system and radiation protection issues, several beamdump configurations are evaluated. The variation of beamdump parameters makes it possible to identify the set of optimal solutions, the Pareto front. It allows to focus on the set of best choices and to choose wisely the best configurations. After describing the validation of TOUCANS on experimental tests performed from 2016 to 2022, the capability of such an approach will be presented.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47679548","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

Experimental validation of cold neutron source performance with mesitylene moderator installed at RANS RANS安装均三甲苯慢化剂对冷中子源性能的实验验证

IF 1.1

Journal of Neutron Research Pub Date : 2022-10-17 DOI: 10.3233/jnr-220034

Yujiro Ikeda, M. Teshigawara, M. Yan, C. Iwamoto, Kunihiro Fujita, Yutaka Abe, Y. Wakabayashi, A. Taketani, Takaoki Takanashi, M. Harada, T. Hashiguchi, Yutaka Yamagata, Yoshio Matsuzaki, B. Ma, M. Takamura, M. Mizuta, Makoto Goto, S. Ikeda, Tomohiro Kobayashi, Y. Otake

{"title":"Experimental validation of cold neutron source performance with mesitylene moderator installed at RANS","authors":"Yujiro Ikeda, M. Teshigawara, M. Yan, C. Iwamoto, Kunihiro Fujita, Yutaka Abe, Y. Wakabayashi, A. Taketani, Takaoki Takanashi, M. Harada, T. Hashiguchi, Yutaka Yamagata, Yoshio Matsuzaki, B. Ma, M. Takamura, M. Mizuta, Makoto Goto, S. Ikeda, Tomohiro Kobayashi, Y. Otake","doi":"10.3233/jnr-220034","DOIUrl":"https://doi.org/10.3233/jnr-220034","url":null,"abstract":"The RANS (RIKEN Accelerator driven Neutron Source), one of compact accelerator neutron sources (CANS), tries to expand its performance by installing a cold neutron which may provide new opportunities in many applications. RANS is a low power CANS with a proton beam of 7 MeV and 100 µA at maximum. A moderator system was constructed based on results of optimization design study with mesitylene. Recently, we have done performance tests aiming at showing characteristics as cold neutron source. Cryogenic mesitylene moderator was installed on a plug with a new target moderator reflector configuration of RANS. Experiment using a gas electron multiplier (GEM) detector was carried out to measure neutron spectra of the cold moderator. This paper describes performance of the cold moderator in terms of 1) Cold neutron gain of optimization design with respect to a polyethylene moderator, 2) Temperature dependency of cold neutron spectrum flux regarding scattering kernel (SK), and 3) comparison between experiment and calculation. A note is given for comparison between calculations with different SKs available. Also, two-dimensional imaging of cold and thermal neutron spectrum flux on the viewed surface is shown with a pinhole slit configuration.","PeriodicalId":44708,"journal":{"name":"Journal of Neutron Research","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41893679","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

Long term operation of a 30 kW Beryllium target at IPHI IPHI 30kW铍靶的长期运行

IF 1.1

Journal of Neutron Research Pub Date : 2022-10-07 DOI: 10.3233/jnr-220024

J. Schwindling, B. Annighöfer, N. Chauvin, J. Meuriot, B. Mom, Frédéric Ott, N. Sellami, L. Thulliez

引用次数: 1