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The effect of indentation depth on performances of Nb3Sn strands in cable of ITER Central Solenoid
https://repo.qst.go.jp/records/72210
https://repo.qst.go.jp/records/72210f516948a-dc49-40d1-9c8f-60f76b13c0a7
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-03-17 | |||||
| タイトル | ||||||
| タイトル | The effect of indentation depth on performances of Nb3Sn strands in cable of ITER Central Solenoid | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
諏訪, 友音
× 諏訪, 友音× 齊藤, 徹× 高橋, 良和× 押切, 雅幸× 堤, 史明× 礒野, 高明× 布谷, 嘉彦× 諏訪 友音× 齊藤 徹× 高橋 良和× 押切 雅幸× 堤 史明× 礒野 高明× 布谷 嘉彦 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A cable-in- conduit conductor is utilized for ITER Central Solenoid (CS). The CS conductor consists of 576 Nb3Sn strands of ~0.83 mm diameter, 288 Cu strands of ~0.83 mm diameter, a central spiral, stainless steel wraps and a stainless steel jacket. In cabling process, the cable was compressed by rollers to reduce void fraction. The strands are deformed by strong interstrand contact force which is generated by the compression of the cable. Cabling process should be optimized to maintain performances of the Nb3Sn strand in the cable. To investigate influence of the deformation on performances of bronze-route and internal-tin Nb3Sn strands, critical current (Ic) and residual resistive ratio (RRR) on artificially indented Nb3Sn strand were measured. The strands were indented artificially in width of ~1 mm before heat treatment to simulate strand deformation in the cable. Ic was drastically degraded by the indentation of which depth were larger than ~0.25 mm and ~0.35 mm on bronze-route and internal-tin strands, respectively. However, the same RRR degradation by indentation was observed on the bronze-route and the internal-tin strands. It was considered that the both degradation was caused by fracture in cross section. Actually, breakages of barrier layer and Nb filaments were found in cross-section at the indentation. Breakage of the filaments and Sn contamination of Cu stabilizer at the indentation are considered to degrade Ic and RRR, respectively. To investigate the degraded area by Sn contamination of Cu and fracture of the filament, elemental mapping and visual inspection by microscope were carried out in longitudinal cross section at the indentation. To maintain Ic performance of the bronze-route and the internal-tin strands, the depth of the deformation should be kept at less than ~0.25 mm and ~0.35 mm, respectively. The results of the elemental mapping and the visual inspection are presented and discussed. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Applied Superconductivity Conference | |||||
| 発表年月日 | ||||||
| 日付 | 2016-09-08 | |||||
| 日付タイプ | Issued | |||||
