Mine Susumu, Xu Minfeng, Bai Ye, Buresh Steve, Stautner Wolfgang, Immer Christopher, Laskaris Evangelos T, Amm Kathleen
GE Global Research Center, Niskayuna, NY 12309 USA.
IEEE Trans Appl Supercond. 2015 Jun;25(3). doi: 10.1109/TASC.2014.2364396. Epub 2014 Oct 22.
The authors had reported components' development of 3 T-250 mm bore MgB magnet system. Pre-reacted MgB tape wire with copper lamination had n-value related problem due to raw Boron particle size inequality, but it had been corrected. Long MgB wires over 3 km had been supplied. All six component coils were made with a wet winding procedure. They were tested individually with the same cooling scheme of conduction cooling as the actual magnet assembly. Though all coils could be ramped to some extent, some coils showed fairly large remnant voltage. Since the voltage distribution over the coil was not even, the uniformity along the wire length may not be good enough. The stability of the coil was verified by its no training performance even with fast ramping. The magnet assembly and its test with conduction cooling were planned. of the superconducting joint with this pre-reacted wire was doubled during past one year's development.
作者曾报道过3T - 250mm孔径MgB磁体系统各部件的研制情况。预反应的MgB带材与铜层压时，由于原始硼颗粒尺寸不均存在n值相关问题，但已得到纠正。已供应了超过3千米的长MgB导线。所有六个部件线圈均采用湿法缠绕工艺制作。它们采用与实际磁体组件相同的传导冷却冷却方案进行单独测试。尽管所有线圈都能在一定程度上进行斜坡升温，但有些线圈显示出相当大的残余电压。由于线圈上的电压分布不均匀，沿导线长度的均匀性可能不够好。即使在快速斜坡升温情况下，通过其无训练性能验证了线圈的稳定性。计划进行磁体组件及其传导冷却测试。在过去一年的研发中，这种预反应导线超导接头的性能提高了一倍。
