脉冲型磁通量泵对YBCO线圈的抽运电流特性
Characteristics of Pumping Current in a YBCO Coil by a Pulse-Type Magnetic Flux Pump
摘要：
2G高温超导线材（YBCO涂层导体）具有良好的载流性能，在高温超导磁体的制造中具有潜在的应用价值。本文介绍了在传导冷却系统和液氮浴低温环境下，用脉冲式磁通量泵对YBCO超导线圈进行抽运的实验结果。对传导冷却系统中的磁通泵进行了优化，增加了一个康铜加热器，使泵桥的温度保持在一定值。在传导冷却系统中，研究了不同温度下YBCO超导线圈的激励效应。当YBCO片的温度（即，泵浦桥）的温度在50 K至80 K的范围内。研究了饱和抽运电流与输入电压、工作频率、磁极数的关系。采用七极结构，在频率为20 Hz、电压为6 V时，饱和电流可达155 A。液氮冷却系统中磁通泵的励磁特性表明，脉冲式磁通量泵在高温超导磁体实际应用中具有可行性。
英文摘要：
2G high temperature superconducting (HTS) wires, YBCO coated conductors, perform a better carrying current capability, which is potentially applied in the manufacture of HTS magnets. This paper presents the experimental results of the pumping current for YBCO coils using a pulse-type magnetic flux pump in the conduction-cooling system and liquid nitrogen bath (LN2) cryogenic environment. Optimization of the flux pump used in the conduction-cooling system is that a constantan heater was added to keep the temperature of the pumping bridge at a certain value. Excitation effects of the YBCO coil at different temperatures were investigated in the conduction-cooling system. A fast-increasing of pumping current in the YBCO coil occurs when the temperature of the YBCO sheet (i.e., pumping bridge) is in the range of 50 K to 80 K. The relationships between saturated pumping current and input voltage, working frequency, numbers of magnetic poles were also studied. Using the seven-pole configuration, the saturated current can reach 155 A when the frequency is 20 Hz and the voltage is 6 V. The excitation characteristics of the flux pump in the LN2 cooling system show the possibility of the pulse-type magnetic flux pump for the practical application of HTS magnets.
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