Neutron irradiation effect on critical current of Nb3Sn wire under 8 T to 15.5 T
Neutron irradiation effect on critical current of Nb3Sn wire under 8 T to 15.5 T
复制标题
8 T~15.5 T下中子辐照对Nb3Sn丝临界电流的影响
DOI：
10.1088/1757-899x/756/1/012013
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Arata Nishimura
中科院分区：
文献类型：
--
作者：
Ohshima S.;Suzuki T.;Matoike R.;Motojima G.;Kado S.;Mori A.;Miyashita A.;Kobayashi S.;Minami T.;Iwata A.;Qiu D.;Wang C.;Luo M.;Zhang P.;Kondo Y.;Nishino N.;Mizuuchi T.;Okada H.;Konoshima S.;Inagaki S.;Nagasaki K.;田中 学，釘宮悠太，丸山大貴，渡辺隆行，松浦次雄;Arata Nishimura
聚变用超导磁体将受到聚变反应产生的快中子的辐照，据报道，超导线材的超导性能会因辐照而发生很大变化。在高达1.7×1023n/m2(~gt；0.1 MeV中子)的裂变反应堆中，用15.5T超导磁体和变温插入器测量了Nb3Sn丝和TiN工艺丝的临界电流变化。经4.9×1022n/m2辐照后，青铜工艺丝的临界电流提高了1.75倍，而经7.9×1022n/m2辐照后，青铜工艺丝的临界电流增加了1.03倍，TiN工艺内部丝的临界电流降低了0.72倍。TiN内部丝材经1.7×1023n/m2辐照后，临界电流急剧下降，临界磁场降至16T左右。这是该类型Nb3Sn丝首次受到高注量中子辐照引起的临界电流和临界磁场的退化。一些辐照缺陷会成为磁通钉扎点，增强钉扎力。但强辐照会破坏超导相，降低材料的性能。
Superconducting magnets for fusion application will be irradiated by fast neutrons produced by fusion reaction, and it has been reported that the superconducting properties of the superconducting wires vary drastically by the irradiation. A bronze route Nb 3 Sn wire and an internal tin process wire were irradiated in a fission reactor up to 1.7× 10 23 n/m 2 (> 0.1 MeV neutron), and the change in the critical current was measured by 15.5 T superconducting magnet and a variable temperature insert. The 4.9× 10 22 n/m 2 irradiation for the bronze route wire increased the critical current by 1.75 times, but the 7.9× 10 22 n/m 2 irradiation showed 1.03 times increase for the bronze route wire and 0.72 times decrease for the internal tin process wire. The 1.7 x 10 23 n/m 2 irradiation for the internal tin process wire decreased the critical current severely and the critical magnetic field down to around 16 T. This was the first result that the high fluence neutron irradiation caused the degradation of both the critical current and the critical magnetic field in this type of a Nb 3 Sn wire. Some irradiation defects will become the magnetic flux pining sites and strengthen the pining force. But the strong irradiation will damage the superconducting phase and degrade the properties.