Development of MgB2 superconducting wire for the low activation superconducting magnet system operated around core D-T plasma
Development of MgB2 superconducting wire for the low activation superconducting magnet system operated around core D-T plasma
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DOI：
10.1016/j.fusengdes.2015.05.005
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发表时间：
2015-10-01
影响因子：
1.7
通讯作者：
Sagara, Akio
中科院分区：
文献类型：
--
作者：
Hishinuma, Yoshimitsu;Kikuchi, Akihiro;Sagara, Akio
MgB_2是一种“低活化超导体”，因为它的诱导放射性半衰期比NbTi、Nb_3Sn和Nb_3Al等Nb基超导体的短得多。如果能提高4 T磁场附近的临界电流密度（J（c）），MgB 2丝将成为极向场和校正反馈线圈中Nb-Ti丝的替代材料。我们发现，使用化合物Mg_2Cu添加Cu是提高k的有效方法，并且成功地制备了具有Cu添加的100 m长的MgB_2线。添加Cu的100 m长的MgB 2的Jc与NbTi线的Jc相当，并且使用添加Cu的MgB 2线的小螺线管线圈达到2.62 T的中心磁场。我们发现，MgB 2线是一种替代商用NbTi线在聚变堆中的硬中子辐照下的材料。此外，我们还使用同位素纯硼-11（B-11）粉末作为硼源制备了添加Cu的MgB 2线以降低放射性。用B-11粉末制备的MgB_2丝的临界温度（Tc）为37 K，不同硼材料的Tc不同。(C)2015年由Elsevier B. V.出版
MgB2 is one of the "low activation superconductors", because the half-life of the induced radio-activity on the MgB2 is much shorter than that of Nb-based superconductors such as NbTi, Nb3Sn and Nb3Al. MgB2 wire would become an alternative material for Nb-Ti wire for the Poloidal Field and correction feedback coils, if the critical current density (J(c)) around the magnetic field of 4T could be improved. We found that addition of Cu using the compound Mg2Cu was an effective method to enhancek and succeed to fabricate 100 m length of MgB2 wire with Cu addition. Jc of the 100 m long MgB2 with Cu addition was comparable to that of a NbTi wire, and the small solenoid coil using Cu added MgB2 wire reached a central magnetic field of 2.62T. We found that MgB2 wire is an alternative material to commercial NbTi wires under the hard neutron irradiation in a fusion reactor. Furthermore, we also fabricated a Cu added MgB2 wire using isotope pure boron-11 (B-11) powder as the boron source to reduce the radioactivity. The critical temperature (T-c) of the MgB2 wire using B-11 powder was found to be 37K, and T-c was found to be changed by different boron materials. (C) 2015 Published by Elsevier B.V.