Effect of neutron irradiation on Nb3Sn wire
Effect of neutron irradiation on Nb3Sn wire
复制标题
中子辐照对 Nb3Sn 丝的影响
DOI：
10.1088/1361-6668/aaf903
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发表时间：
2019
影响因子：
3.6
通讯作者：
Awaji Satoru
中科院分区：
文献类型：
--
作者：
Nishimura Arata;Nakamoto Tateshi;Yoshida Makoto;Iio Masami;Yamazaki Masanori;Toyama Takeshi;Hishinuma Yoshimitsu;Oguro Hidetoshi;Awaji Satoru
为研究高磁场下中子辐照对临界电流的影响，制备了用于ITER环形场线圈导体的Nb - 3sn导线。在日本东北大学超导材料高场实验室用28 T混合超导磁体在液氦中测量了原始导线的临界电流。在日本东北大学国际核材料科学研究中心，用热传导型变温插片（VTI）在真空中进行了测量。在比利时BR2用裂变中子在低于100℃的条件下辐照金属丝，辐照后的临界电流为4.9× 10 22中子m−2 (> 0.1 MeV)，用VTI测量了辐照后的临界电流在8-15.5 t范围内，讨论了两种设备测量的临界电流的差异，重点讨论了纯铜样品架的焦耳加热。对临界电流和中子辐照效应研究的15.5 T·结果表明,临界电流测量真空就低于液态氦的温升样本焊接试样夹,临界电流增加了中子辐照,和当前比(C /我C0)几乎是常数1.75在8 - 15.5 T 4 K左右。
A Nb 3 Sn wire which was manufactured for the ITER toroidal field coil conductor by a bronze route process was prepared for this study to investigate the effect of neutron irradiation on the critical current in a high magnetic field. The critical current of the virgin wire was measured in liquid helium with a 28 T hybrid superconducting magnet at the High Field Laboratory for Superconducting Materials in Tohoku University. It was also measured in vacuum with a heat conduction type variable temperature insert (VTI) at the International Research Center for Nuclear Materials Science at Tohoku University. The wire was irradiated at below 100 C by fission neutrons at up to 4.9× 10 22 neutrons m− 2 (> 0.1 MeV) at BR2 in Belgium, and the critical current after the irradiation was evaluated with a VTI in the range of 8–15.5 T. The difference of the critical current measured with two facilities was discussed, focussing on Joule heating of the sample holder which was made of pure copper, and the neutron irradiation effect on the critical current was investigated in the range of up to 15.5 T. The results show that the critical current measured in vacuum becomes lower than that in liquid helium because of the temperature rise of the sample holder where the sample was soldered, the critical current was increased by the neutron irradiation, and the current ratio (I C/I C0) was almost constant of 1.75 in the range of 8–15.5 T at around 4 K.