2G high-temperature superconducting (HTS) wires and YBCO-coated conductors perform better carrying current capability, which is potentially applied to the manufacture of HTS magnets. This article 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 (LN ₂ ) cryogenic environment. The 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. The excitation effects of the YBCO coil at different temperatures were investigated in the conduction-cooling system. A fast increase of pumping current in the YBCO coil occurs when the temperature of the YBCO sheet (i.e., pumping bridge) is in the range of 50–80 K. The relationships among the 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 LN ₂ cooling system show the possibility of the pulse-type magnetic flux pump for the practical application of HTS magnets.

中文翻译：

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脉冲型磁通泵在YBCO线圈中泵浦电流的特性


2G高温超导（HTS）线材和YBCO涂层导体具有更好的载流能力，有望应用于HTS磁体的制造。本文介绍了在传导冷却系统和液氮浴（LN ₂ ）低温环境中使用脉冲型磁通泵对YBCO线圈进行泵浦电流的实验结果。传导冷却系统中使用的通量泵的优化是增加了康铜加热器，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线圈的励磁效果。当YBCO片（即泵浦桥）的温度在50~80 K范围内时，YBCO线圈中的泵浦电流会快速增加。饱和泵浦电流与输入电压、工作频率、线圈数量之间的关系还研究了磁极。采用七极结构，当频率为20 Hz、电压为6 V时，饱和电流可达155 A。LN ₂冷却系统中磁通泵的励磁特性表明了脉冲型磁通的可能性用于高温超导磁体实际应用的泵。