Critical currents in REBaCuO superconducting tapes in response to neutron irradiation
Critical currents in REBaCuO superconducting tapes in response to neutron irradiation
复制标题
REBaCuO 超导带响应中子辐照的临界电流
DOI：
10.1088/1361-6668/ab099c
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发表时间：
2019
影响因子：
3.6
通讯作者：
L. Viererbl
中科院分区：
文献类型：
--
作者：
M. Jirsa;M. Rameš;I. Ďuran;T. Entler;L. Viererbl
研究了多家制造商生产的超导 REBaCuO 带材对中子辐照响应的电磁性能。目的是测试使用这些胶带为聚变反应堆连接高温超导磁体的可行性。采用磁感应来确定临界电流。在没有额外钉扎中心的未辐照 SuNAM、SuperOx 和 SuperPower 磁带中，归一化钉扎力密度作为归一化磁场 h 的函数，在整个 10 K–80 K 温度范围内，在 h = 0.2 左右呈现出常见的单峰。在未辐照 AP（高级钉扎）SuperPower 磁带中，这种依赖性在 70 K 以下形成了一种异常形状。该特征随着中子注量的增加而改变。人们发现中子辐照对临界电流的影响相当复杂。在所有样品中，总注量为 8.03 × 1022 m−2 的中子辐照导致在 10 K–77 K 温度范围内的低磁场下出现临界电流衰减。在高磁场下，效果因磁带的初始钉扎结构、温度和中子注量而异。在 77 K 时，所有样品中的电流均降低，不可逆场也降低。在中间温度下，临界电流几乎没有变化，而在低于 30 K 的温度下，临界电流增加。
Electromagnetic performance of superconducting REBaCuO tapes from several manufacturers was investigated in response to neutron irradiation. The aim was to test the feasibility of using these tapes for wiring high-Tc superconducting magnets for fusion reactors. Magnetic induction was employed to determine critical currents. In non-irradiated SuNAM, SuperOx, and SuperPower tapes without additional pinning centers, the normalized pinning force density as a function of the normalized magnetic field, h, exhibited the commonly observed single peak at about h = 0.2 in the whole temperature range 10 K–80 K. In the non-irradiated AP (advanced pinning) SuperPower tapes this dependence developed an extraordinary shape below 70 K. This feature changed with increasing neutron fluence. The effect of neutron irradiation on critical currents was found to be rather complex. In all samples, neutron irradiation by a total fluence of 8.03 × 1022 m−2 caused a critical current degradation at low magnetic fields in the temperature range 10 K–77 K. At high magnetic fields, the effect varied depending on the tape’s initial pinning structure, temperature, and neutron fluence. At 77 K, the current decreased and the irreversibility field was reduced in all the samples. At intermediate temperatures the critical current nearly did not change, while at temperatures below 30 K the critical current increased.