A kilo-ampere level HTS flux pump
A kilo-ampere level HTS flux pump
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DOI：
10.1088/1361-6668/ab1821
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发表时间：
2019-01
影响因子：
3.6
通讯作者：
J. Geng;T. Painter;Peter Long;J. Gawith;Jiabin Yang;Jun Ma;Q. Dong;B. Shen;C. Li;T. Coombs-T.
中科院分区：
文献类型：
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作者：
J. Geng;T. Painter;Peter Long;J. Gawith;Jiabin Yang;Jun Ma;Q. Dong;B. Shen;C. Li;T. Coombs-T.
本文报道了一种新研制的动态电阻开关的大电流变压器-整流器高温超导磁通泵。使用该器件在77 K下实现了超过1.1 kA的准持续电流，这是迄今为止任何HTS通量泵报告的最高工作电流。在相同的电流水平下，该器件的尺寸比传统的电流引线和电源小得多。平行YBCO涂层导体用于Transformer次级绕组以及超导负载线圈中以实现高电流。输出电流受负载的临界电流限制，而不是磁通泵本身。此外，在超过1 kA的电流水平，该装置可以保持高通量注入精度，和整体通量涟漪小于0.2毫韦伯。这项工作显示了使用该设备在超高准持续电流模式下操作高场HTS磁体的潜力，从而大大降低了高场磁体的电感、尺寸、重量和成本，使其更容易获得。这也表明，该设备是有前途的高温超导NMR/MRI磁体，其中的磁场稳定性的要求是苛刻的。
This paper reports a newly developed high current transformer–rectifier high-Tc superconducting (HTS) flux pump switched by dynamic resistance. A quasi-persistent current of over 1.1 kA has been achieved at 77 K using the device, which is the highest reported operating current by any HTS flux pumps to date. The size of the device is much smaller than traditional current leads and power supplies at the same current level. Parallel YBCO coated conductors are used in the transformer secondary winding as well as in the superconducting load coil to achieve high current. The output current is limited by the critical current of the load rather than the flux pump itself. Moreover, at over 1 kA current level, the device can maintain high flux injection accuracy, and the overall flux ripple is less than 0.2 milli-Weber. The work has shown the potential of using the device to operate high field HTS magnets in ultra-high quasi-persistent current mode, thus substantially reducing the inductance, size, weight, and cost of high field magnets, making them more accessible. It also indicates that the device is promising for powering HTS NMR/MRI magnets, in which the requirement for magnetic field stability is demanding.