スーパーインシュレータ(ポリイミド及びポリエステル)のγ線照射後のガス生成量と機械的特性

誠司 勅使河原, 譲一 草野, 憲雄 森下, 藤夫 前川, 崇英 加藤, 謙二 細山, 和文 原, 裕二 小島
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引用次数: 2

Abstract

Japanese intense spallation neutron source (JSNS) driven by 3 GeV protons with power of 1 MW is constructed under the joint project of Japan Atomic Energy Agency and High Energy Accelerator Research Organization. Supercritical hydrogen of around 20K with 2 MPa is selected as a neutron moderator material and cryogenic hydrogen transfer lines are constructed from the moderators to the refrigerator. Then, a super insulator (SI) is adopted to reduce heat load in the hydrogen transfer lines. We performed irradiation test of SI using 60Co gamma ray to evaluate the irradiation effect. Two kinds of super insulator (polyimide and polyester) coated both sides by aluminum with thickness of 5 x 10-8 m were irradiated. After gamma ray irradiation, tensile test and gas yield measurement of super insulator were performed. Polyester based SI became brittle at about 10 MGy, on the other hand, polyimide based SI did not loss ductility so much even 80 MGy. Polyester based SI generated gas yield higher than that of polyimide based SI about one order of magnitude. We developed the gas analysis method by using a Q-mass and a mass-flow, providing to identify the unknown gas (i.e. H2O) effectively compared to a gas chromatography method.
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伽马伽马射线照射后超级调节器(聚酰亚胺和聚酯)的气体生成量和机械特性
日本强散裂中子源(JSNS)是由日本原子能机构和高能加速器研究机构联合建设的,由3 GeV质子驱动,功率为1 MW。选择20K左右、2mpa的超临界氢作为中子减速剂材料,构建了从减速剂到冷冻机的低温氢传输线。然后,采用超级绝缘子(SI)来降低氢传输管道的热负荷。我们用60Co伽马射线对SI进行辐照试验,评价辐照效果。对两种双面镀铝厚度为5 × 10-8 m的超级绝缘子(聚酰亚胺和聚酯)进行辐照。经γ射线辐照后,对超级绝缘子进行了拉伸试验和产气量测定。聚酯基SI在约10 MGy时变脆,而聚酰亚胺基SI即使在80 MGy时也不会失去如此多的延展性。聚酯基硅树脂的产气率比聚酰亚胺基硅树脂的产气率高一个数量级。我们开发了使用q -质量和质量流量的气体分析方法,与气相色谱法相比,可以有效地识别未知气体(即H2O)。
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