Proceedings of the 14th International Workshop on Spallation Materials Technology最新文献

{"title":"Measurement of Displacement Cross Section of Structural Materials Utilized in the Proton Accelerator Facilities with the Kinematic Energy above 400 MeV","authors":"S. Meigo, H. Matsuda, Y. Iwamoto, Makoto Yoshida, S. Hasegawa, F. Maekawa, H. Iwamoto, T. Nakamoto, T. Ishida, S. Makimura","doi":"10.7566/jpscp.28.061004","DOIUrl":"https://doi.org/10.7566/jpscp.28.061004","url":null,"abstract":"For damage estimation of structural material in the accelerator facility, displacement per atom (DPA) is widely employed as an index of the damage calculated based on the displacement cross section obtained with the calculation model. Although the DPA is employed as the standard, the experimental data of displacement cross section are scarce for a proton in the energy region above 20 MeV. Among the calculation models, the difference exists about 8 times so that experimental data of the displacement cross section is crucial to validate the model. To obtain the displacement cross section, we conducted the experiment in J-PARC. As a preliminary result, the displacement cross section of copper was successfully obtained for 3-GeV proton. The present results showed that the widely utilized the Norgertt-Robinson-Torrens (NRT) model overestimates the cross section as suggested by the previous experiment for protons with lower energy.","PeriodicalId":277265,"journal":{"name":"Proceedings of the 14th International Workshop on Spallation Materials Technology","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115509715","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}

{"title":"Radiation Effects in Greases for Use in Facilities Producing Intense Neutron Fields","authors":"M. Ferrari, A. Zenoni, Yongjoong Lee, A. Andrighetto","doi":"10.7566/jpscp.28.061005","DOIUrl":"https://doi.org/10.7566/jpscp.28.061005","url":null,"abstract":"Polymeric components are used in accelerator and target environments where intense neutron and gamma fields are present. Nine commercially available greases were selected to study their radiation-induced functional degradation for use in spallation neutron sources and in facilities producing radioactive ion beams. Grease samples were irradiated in the mixed neutron and gamma field of a nuclear research reactor up to several MGy of total absorbed dose. Methodologies for the irradiation and post-irradiation examination of grease samples are developed. The different degree of radiation tolerance of the tested samples was compared. Some of the greases showed dramatic radiation-induced changes of their physical properties, while others remain stable up to the highest values of delivered absorbed dose.","PeriodicalId":277265,"journal":{"name":"Proceedings of the 14th International Workshop on Spallation Materials Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121673628","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}

{"title":"Introduction to the Proceedings","authors":"Koichi Sato, E. Wakai, S. Makimura, S. Saito, T. Ishida, N. Okubo, M. Teshigawara, K. Kikuchi","doi":"10.7566/JPSCP.28.021001","DOIUrl":"https://doi.org/10.7566/JPSCP.28.021001","url":null,"abstract":"IWSMT-14 had 18 sessions which were essentially related research subjects of the spallation materials technologies such as: Session 1 Welcome & Keynote Address Session 2 Keynote Address: Facilities Session 3 Keynote Address: RaDIATE and Fusion Application Session 4 W materials and the Basic Research Session-5 Keynote Address: Facilities Session-6 Corrosion in Liquid Metals Session-7 Facility Development and The Related Research Session-8 Basic Damage Study JPS Conf. Proc. , 021001 (2020)","PeriodicalId":277265,"journal":{"name":"Proceedings of the 14th International Workshop on Spallation Materials Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133207984","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}

{"title":"Radiation Damage Studies on Titanium Alloys as High Intensity Proton Accelerator Beam Window Materials","authors":"T. Ishida, E. Wakai, S. Makimura, P. Hurh, K. Ammigan, A. Casella, David Edwards, D. Senor, C. Densham, M. Fitton, J. Bennett, Dohyun Kim, N. Simos, M. Calviani, C. Martin","doi":"10.7566/JPSCP.28.041001","DOIUrl":"https://doi.org/10.7566/JPSCP.28.041001","url":null,"abstract":"A high-strength dual alpha+beta phase titanium alloy Ti-6Al-4V is utilized as a material for beam windows in several accelerator target facilities. However, relatively little is known about how material properties of this alloy are affected by high-intensity proton beam irradiation. With plans to upgrade neutrino facilities at J-PARC and Fermilab to over 1 MW beam power, the radiation damage in the window material will reach a few displacements per atom (dpa) per year, significantly above the ~0.3 dpa level of existing data. The RaDIATE collaboration has conducted a high intensity proton beam irradiation of various target and window material specimens at BLIP facility, including a variety of titanium alloys. Post-Irradiation Examination of the specimens in the 1st capsule, irradiated at up to 0.25 dpa, is in progress. Tensile tests in a hot cell at PNNL exhibited a clear signature of radiation hardening and loss of ductility for Ti-6Al-4V, while Ti-3Al-2.5V, with less beta phase, exhibited less severe hardening. Microstructural investigations will follow to study the cause of the difference in tensile behavior between these alloys. High-cycle fatigue (HCF) performance is critical to the lifetime estimation of beam windows exposed to a periodic thermal stress from a pulsed proton beam. The 1st HCF data on irradiated titanium alloys are to be obtained by a conventional bend fatigue test at Fermilab and by an ultrasonic mesoscale fatigue test at Culham Laboratory. Specimens in the 2nd capsule, irradiated at up to ~1 dpa, cover typical titanium alloy grades, including possible radiation-resistant candidates. These systematic studies on the effects of radiation damage of titanium alloys are intended to enable us to predict realistic lifetimes of current beam windows made of Ti-6Al-4V and to extend the lifetime by choosing a more radiation and thermal shock tolerant alloy.","PeriodicalId":277265,"journal":{"name":"Proceedings of the 14th International Workshop on Spallation Materials Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130345266","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}