Influence of torsional strain on the Bi-2212 tapes and round wires under background field
Influence of torsional strain on the Bi-2212 tapes and round wires under background field
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DOI：
10.1016/j.fusengdes.2017.04.041
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发表时间：
2017-11
影响因子：
1.7
通讯作者：
Liyuan Liu;Wei Chen-;Jiangtao Shi;Chengshan Li;Q. Hao;M. Pan;Xinsheng Yang;Yong Zhang;Yong Zhao
中科院分区：
文献类型：
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作者：
Liyuan Liu;Wei Chen-;Jiangtao Shi;Chengshan Li;Q. Hao;M. Pan;Xinsheng Yang;Yong Zhang;Yong Zhao
Bi-2212圆丝是目前唯一一种可以制成圆丝的无各向异性高温超导体，在聚变堆超导磁体中具有很大的应用潜力。然而，Bi-2212是脆性的并且对应变敏感，这导致低的机械性能。研究应变对输运性质影响的工作主要集中在轴向应变上。然而，导体将不可避免地受到扭转应变在CICC。Bi-2212在背景磁场作用下的扭转应变的研究很少有报道。本文研究了Bi-2212带材和圆丝在扭转和背景磁场作用下的临界电流（Ic），并进行了比较。测量在77 K和0-20 mT下进行。结果表明，Bi-2212带材的Ic与磁场角度有很强的相关性，而磁场角度对圆丝的影响很小。虽然外磁场和扭转角对Bi-2212带材和圆丝有影响，但测试样品的Ic退化更依赖于外磁场强度而不是扭转角。
As the only high-temperature superconductor (HTS) that can be made into round wire without anisotropy, Bi-2212 round wire holds significant potential for applications as CICC (cable in conduit conductor) for superconducting magnets in fusion reactors. However, Bi-2212 is brittle and sensitive to strain which leads to a low mechanical performance. The effort on studying the impact of strain on the transport properties is mainly focus on the axial strain. However, the conductor will be inevitably subjected to torsional strain in the CICC. The torsional strain of Bi-2212 under background magnetic field has been rarely reported. In this paper, the critical current (Ic) of Bi-2212 tape and round wire under torsion and background magnetic field is investigated and compared with each other. The measurement is performed at 77 K and 0–20 mT. The result demonstrates that theIcof Bi-2212 tape is strongly dependent on the magnetic field angle, while magnetic field angle has little influence on round wires. Although the external magnetic field and torsional angle have impact on Bi-2212 tape and round wire, theIcdegradation of tested samples is more dependent on external magnetic field intensity than that of torsional angle.