Mechanical Properties Evaluation of Large Scale Superconductors in High Magnetic Field and Large Current under Cryogenic Temperatute.

低温强磁场大电流下大型超导体力学性能评价。

• 批准号: 06555207
• 负责人: NISHIMURA Arata
• 金额: $ 11.65万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555207/
• 关键词: Large scale superconductors; High magnetic field; Cryogenic temperature; Mechanical test; Large current; Stability; Mechanical deformation; 超伝導導体

Large scale plasma devices, such as the Large Helical Device, the Wenderstein 7-X and the International Thermo-nuclear Experimental Reactor, have been planed and started to fabrication. These large devices require the large scale superconducting magnet to generate high magnetic fields. Since huge electro-magnetic forces will act on the superconducting magnet during the operation, the mechanical deformation behavior must estimate before fabrication. For this purpose, the several kinds of measurements for the deformation evaluation have been carried out in this study.1.NbTi superconductor which had a copper ratio of 1.0 to 2.0, was deformed locally at room temperature, and then was cooled into liquid helium. In this case, a recovery after quenching was delayd because of the increase of an electrical resistance of copper. On the other hand, when the superconductor was deformed at cryogenic temperature, the recovery occurred in a normal way. From these results, it was recognized that the changes of the electric property of a stabilizer were affected by the mechanical deformation and it should be noted on the magnet design and fabrication.2.The superconductors which was used for the Large Helical Device had a rather stability to mechanical deformation. The coil deformation would be estimated by the mechanical test using a coil pack.3.An excitation test of Inner Vertical coil of the Large Helical Device was carried out, and the deformation during cooling period and excitation test was measured successfully. In the deformation measurement, cable wires should be considered not to be affected by magnetic field.

大型等离子体装置，如大螺旋装置、文德斯坦7-X和国际热核实验堆等，已经计划并开始制造。这些大型装置需要大尺寸超导磁体来产生高磁场。由于超导磁体在运行过程中会受到巨大的电磁力作用，因此在制造前必须对其机械变形行为进行评估。为此，本研究进行了几种变形评价的测量。1.铜比为1.0 ~ 2.0的NbTi超导体在室温下局部变形，然后冷却到液氦中。在这种情况下，由于铜的电阻增加，淬火后的恢复延迟。另一方面，当超导体在低温下变形时，回复以正常方式发生。结果表明，机械变形对稳定器电性能的变化有一定的影响，在磁体的设计和制造中应注意。2.用于大螺旋装置的超导体对机械变形具有较好的稳定性。利用线圈包进行力学试验，估算线圈变形量。3.对大螺旋装置内立线圈进行了激振试验，成功测量了冷却期和激振期线圈变形量。在变形测量中，应考虑电缆导线不受磁场影响。