Research and Development of Long-life Target for Spallation Neutron Source

散裂中子源长寿命靶材的研制

• 批准号: 11358008
• 负责人: KAWAI Masayoshi
• 金额: $ 23.97万
• 依托单位: High Energy Accelerator Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11358008/
• 关键词: Spallation Neutron Source; Solid Target; Tungsten Alloys; Neutron Engineering; Thermo-hydraulic Design; Material Property Test; Corrosion Test; Radiation Damage Experiments; 中性子; 陽子; ターゲット; 核破砕反応; タングステン; タンタル; 溶融塩浴; 照射実験; HIP法

This research has been made by selecting tungsten as a candidate of target materials having a high neutron performance and a long life for MW-class high power spallation neutron source in the wide field covering from material production to optimum target system development. The main results are as follows :(1) Target material production : New heavy metal composed of tungsten and stainless steel was developed by means of powder metallurgical technique, aiming at developing a high tough and corrosion-resistant tungsten alloy. Its thermal property was not as expected but the technique will be much instructive for powder metallurgy.(2) Cladding technique : Tantalum clad gives a corrosion-resistance to tungsten target. Three kinds methods such as hot-isostatic press method, brazing technique and molten-salt electro chemical method were developed. The development of HIP method has been established and successfully applied to fabrication of the tungsten target block for renewal of target-mode … More rator-reflector assembly of KENS at High Energy Accelerator Research Organization. The latter two methods were examined and their applicability was confirmed.(3) Measurement of material properties : Material properties of various tungsten alloys and target materials were investigated. Especially, corrosion tests gave a lot of scientifically interesting data : parameter dependence on temperature and water flow and data for interpretation of corrosion mechanism.(4) Nuclear and Thermo-hydraulic study of solid target : Neutron and Thermo-hydraulic performance was studied by applying computer simulation. The solid target system for MW-class spallation neutron source was designed and its performance was clarified to be superior to that of liquid target system up to 2 MW. As a complemented study, thermo-hydraulic experiments were made to evaluate the correlation formula to have been used for designs.(5) Study on material irradiation effects : Target is heavily exposed by high-energy protons and neutrons, and radiation damage will determine the target life. We have participated in the international collaboration experiments (STIP Experiments) to irradiate the target materials put in the spallation target of SINQ facility at PSI (Polly-Sheller Institute in Switzerland) and send the many specimen of tungsten alloys, platinum and structural materials to there. Now, the specimens are under irradiation.The irradiated specimen of the STIP Experiments will be returned in 2005 and 2007. Therefore, we have to continue the research to make post irradiation experiments even after this Grant-in-Aid for Scientific Research (A) (1). Additionally, new irradiation-resistant material is urgently needed for higher power spallation sources for the Accelerator-Driven System to transmute long-lived nuclear waste isotopes to shorter nuclides and for fusion reactor. Further research is planed to establish the techniques to develop new materials, cladding technique and so on. Less

本研究选择了具有高中子性能和长寿命的钨作为MW级高功率溅射中子源靶材料的候选材料，从材料生产到最佳靶系统的研制都进行了广泛的研究。主要研究结果如下：（1）靶材制备：采用粉末冶金技术，研制了钨和不锈钢组成的新型重金属，旨在开发一种高坚韧、耐腐蚀的钨合金。其热性能不如预期，但该工艺对粉末冶金具有指导意义。(2)包覆技术：钽包覆提供了一个耐腐蚀的钨靶。开发了热等静压法、钎焊法和熔盐电化学法三种方法。建立了热等静压工艺的发展，并成功地应用于钨靶块的制备，实现了靶模的更新 ...更多信息 高能加速器研究组织的KENS的旋转器-反射器组件。后两种方法进行了检查，并确认其适用性。(3)材料性能的测量：研究了各种钨合金和靶材的材料性能。特别是，腐蚀试验提供了许多科学上有趣的数据：参数对温度和水流量的依赖性以及解释腐蚀机理的数据。(4)固体靶的核与热工水力学研究：应用计算机模拟技术研究了固体靶的中子与热工水力学性能。设计了兆瓦级空间中子源固体靶系统，阐明了其性能优于2兆瓦以下液体靶系统的上级性能。作为补充研究，进行了热工水力学实验，以评估已用于设计的关联式。(5)材料辐照效应研究：靶板受到高能质子和中子的强烈辐照，辐照损伤将决定靶板的寿命。我们参与了国际合作实验（STIP实验），对放置在PSI（Polly-Sheller Institute in Switzerland）SINQ设施的空间靶中的靶材料进行辐照，并将大量钨合金、铂和结构材料的样品送至那里。目前，样品正在接受辐照，经过辐照的STIP实验样品将于2005年和2007年返回。因此，即使在科学研究补助金（A）（1）之后，我们也必须继续进行研究，进行辐照后实验。此外，加速器驱动系统将长寿命核废料的同位素转化为短寿命核素的高功率放射源和聚变反应堆迫切需要新的耐辐照材料。进一步的研究计划建立新材料开发技术、熔覆技术等。

项目成果

Y.Ishijima et al.: "Corrosion Resistance in Water Coolant for Refractory Metals"Proc of 10th International Conference on Fusion Reactor Materials, 2001. 6 (2002)

Y.Ishijima 等：“耐火金属水冷却剂的耐腐蚀性”第 10 届国际聚变反应堆材料会议记录，2001. 6 (2002)

J.-F.Li, et al.: "Liquid Phase Sintering of W/Stailnless Steel Powder Compacts"Proc.of 2000 powder Metallurgy World Congress, Nov.12-16,Kyoto. 4 (2000)

J.-F.Li 等人：“W/Stainless Steel Powder Compacts 的液相烧结”Proc. of 2000 粉末冶金世界大会，11 月 12-16 日，京都​​。

M.Kawai et al.: "Development of Solid Target for MW Class Spallation Neutron Source"5th Int. Workshop on Spallation Materials Technology, May 2002. (予定). 8 (2002)

M.Kawai 等人：“MW 级散裂中子源的固体靶材的开发”第 5 届散裂材料技术国际研讨会，2002 年 5 月。（计划）8 (2002)。

M.Kawai, K.Kikuchi, ed.: "Proc. of 2nd Workshop on the Materials Technology for Spallation Neutron Source"KEK Proceedings 2001-11. 326 (2001)

M.Kawai、K.Kikuchi 编：“第二届散裂中子源材料技术研讨会论文集”KEK Proceedings 2001-11。

M.Kawai, et al.: "Fabrication of Tantalum-Clad Tungsten Target for KENS"J.of Nuclear Material. 8 (2001)

M.Kawai 等人：“KENS 的钽包钨靶材的制造”J.of Nuclear Material。