学術雑誌論文 The Effect of Indentation Depth on Performances of Nb3Sn Strands in cable of ITER Central Solenoid

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

27 ( 4 )  , pp.4201505-1 - 4201505-5 , 2017-01 , IEEE
内容記述
The ITER Central Solenoid is composed Nb3Sncable-in-conduit conductor. Short twist pitch cable design isappropriate for the CS cables to maintain the current sharingtemperature under electromagnetic loading cycles. In theproduction process of the short twist pitch CS cable, Nb3Snstrands and Cu strands are cabled tightly and compressed to getcircular shape. However, these process induced strong interstrandcontact force and the strands deformation. The strandperformance are degrade by the severe indentation on thestrands at the contact point between the strands, although thestrands is deformed before the heat-treatment. Therefore,influence of the indentation on critical current and residualresistive ratio were investigated in two types of bronze-route andan internal-tin Nb3Sn strands which are used for the CS cable, inorder to determine the threshold of indentation depth in thestrands. Also, transverse cross-sectional observation by EPMAwas carried out on the indented strands to investigate the damagein the cross-section. Before August 2016, 37 CS cables weremanufactured. On 37 CS cables manufactured before August2016, numbers of indentations on the Nb3Sn strands wereinvestigated to confirm whether there was indentation on theNb3Sn strands which degrades the strand performance.

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