论文标题
应变和野外坡道功能形式对复合NB3SN电线中的热磁不稳定性的影响
Impact of strain and field ramp functional form on thermomagnetic instabilities in composite Nb3Sn wires with multi-filaments inside the superconducting coil
论文作者
论文摘要
我们理论上分析了CU/SC（超导体）比，应变和坡道路径对超导线圈热磁不稳定性的影响。通过考虑多丝状结构，我们发现较低的CU/SC比导致较高的温度峰。应变会导致较高的通量跳跃频率和较高的电压峰。温度更加困难地恢复到工作温度，而在菌株存在下，SC线却早些时候淬灭。对于锯齿状的坡道案例，在减少的分支处发生了很少的通量跳跃，而当施加的电流超过预先存在的峰时，可以立即观察到频繁的通量跳跃。我们的模拟结果与NB3SN线圈中的实验观测非常吻合。此外，与在线性坡道案例中观察到的脉冲磁通跳动不同，当施加的电流足够大时，在增加的分支上观察到巨大和延长的通量跳跃。
We theoretically analyze the effects of Cu/SC (superconductor) ratio, strain, and the ramp path on thermomagnetic instabilities of the superconducting coil. By considering the multi-filamentary structures, we find that a lower Cu/SC ratio leads to higher temperature peaks. The strain causes a higher frequency of flux jumps and higher voltage peaks. The temperatures recover to working temperature more difficultly and SC wires quench earlier in the presence of strain. For the jagged ramp cases, few flux jumps occur at the decreasing branch, whereas frequent flux jumps can be observed promptly when the applied current exceeds the pre-existing peak. Our simulated results agree well with experimental observations in Nb3Sn coils. Additionally, unlike the pulsed flux jumps observed in linear ramp cases, giant and prolonged flux jumps are observed at the increasing branch with a sinusoidal ramp path when the applied current is sufficiently large.
