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首页> 外文期刊>Physica, C. Superconductivity and its applications >Thermal properties of a large-bore cryocooled 10 T superconducting magnet for a hybrid magnet
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Thermal properties of a large-bore cryocooled 10 T superconducting magnet for a hybrid magnet

机译：用于混合磁体的大口径低温冷却10 T超导磁体的热性能

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A cryocooled 10 T superconducting magnet with a 360 mm room temperature bore has been developed for a hybrid magnet. The superconducting magnet cooled by four Gifford-McMahon cryocoolers has been designed to generate a magnetic field of 10 T. Since superconducting wires composed of coils were subjected to large hoop stress over 150 MPa and Nb_3Sn superconducting wires particularly showed a low mechanical strength due to those brittle property, Nb_3Sn wires strengthened by NbTi-filaments were developed for the cryocooled superconducting magnet. We have already reported that the hybrid magnet could generate the resultant magnetic field of 27.5 T by adding 8.5 T from the superconducting magnet and 19 T from a water-cooled Bitter resistive magnet, after the water-cooled resistive magnet was inserted into the 360 mm room temperature bore of the cryocooled superconducting magnet. When the hybrid magnet generated the field of 27.5 T, it achieved the high magnetic-force field (B × ?Bz/?z) of 4500 T~2/m, which was useful for magneto-science in high fields such as materials levitation research. In this paper, we particularly focus on the cause that the cryocooled superconducting magnet was limited to generate the designed magnetic field of 10 T in the hybrid magnet operation. As a result, it was found that there existed mainly two causes as the limitation of the magnetic field generation. One was a decrease of thermal conductive passes due to exfoliation from the coil bobbin of the cooling flange. The other was large AC loss due to both a thick Nb_3Sn layer and its large diameter formed on Nb-barrier component in Nb_3Sn wires.
机译：已经开发出具有360 mm室温孔的低温冷却10 T超导磁体，用于混合磁体。通过四个Gifford-McMahon低温冷却器冷却的超导磁体被设计为产生10 T的磁场。由于由线圈组成的超导线经受了150 MPa以上的大环向应力，并且Nb_3Sn超导线特别由于这些原因而表现出较低的机械强度。研制了一种低温脆性的超导磁体，并用NbTi丝增强了Nb_3Sn线。我们已经报道过，在将水冷电阻磁体插入360 mm后，通过将超导磁体的8.5 T和水冷的Bitter电阻磁体的19 T相加，混合磁体可以产生27.5 T的合成磁场低温冷却的超导磁体的室温孔。当混合磁体产生27.5 T的磁场时，它获得了4500 T〜2 / m的高磁场（B×？Bz /？z），这对于材料悬浮等高领域的磁科学很有用研究。在本文中，我们特别关注致冷混合超导磁体在生成10 T设计磁场时受到限制的原因。结果，发现主要有两个原因作为磁场产生的限制。一是由于从冷却凸缘的线圈架剥落而导致的导热次数减少。另一个是由于厚的Nb_3Sn层及其在Nb_3Sn导线中的Nb势垒分量上形成的大直径而导致的较大的交流损耗。

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