Abstract:

The method and device for the critical current test of NbTi superconducting strand in different temperature are introduced, which mainly contains a background field system and a variable cryostat system. The background field is supplied by a superconducting magnet with a Ø70mm warm bore, in which the current leads are designed to satisfy the NbTi critical current test and the superconducting magnet could produce fields up to 16T. The strand critical current in different field and different temperature has been acquired by this system, the result is fitted with the “Luca” law, and then the performance of the strand can be evaluated integrally.

Key words: Critical current density, Upper critical field, NbTi superconducting strand, Variable temperature cryostat

摘要：

介绍了一种用于ITER的NbTi超导股线在不同温度下临界电流测试的方法和装置。该装置包括一孔径为70mm、最高磁场高达16T的背景磁体以及变温杜瓦等系统。对NbTi超导线变温测试设计了二元电流引线。用该系统得到了其NbTi超导股线在不同磁场不同温度下的临界电流，用“Luca”定标律拟合了测试结果，并对测试结果进行了分析。

关键词: 临界电流密度, 上临界磁场, NbTi超导股线, 变温杜瓦