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研究了不同芯数(单芯、6芯和12芯)的C掺杂MgB2超导线材的失超特性.在制冷机环境(20K)下测量了C掺杂MgB2超导线材样品在自场下的最小触发能及失超传播速度.实验结果表明,失超传播速度随着工作电流的增大而线性增加.失超传播速度的大小跟测量位置有关,离触发区越近的传播速度越大.单芯样品的最小触发能最小,6芯和12芯线的最小触发能相差不大.最小触发能随工作电流的增加成指数形式衰减.
The quench characteristics of C-doped MgB2 superconducting wires with different cores (single-core, 6-core and 12-core) were investigated.The samples of C-doped MgB2 superconducting wires were measured in a freezer environment The results show that the velocity of quench propagation increases linearly with the increase of working current.The velocity of quench propagation depends on the position of measurement and the velocity of propagation closer to the trigger zone is greater The minimum triggering energy of the single core sample is the smallest, and the minimum triggering energy of the 6-core and 12-core wires is the same, and the minimum triggering energy decay exponentially with the increase of the operating current.