A novel high temperature superconducting magnetic flux pump for MRI magnets

被引：80
作者：
Bai, Zhiming [2 ]
Yan, Guo [3 ]
Wu, Chunli [1 ]
Ding, Shufang [2 ]
Chen, Chuan [2 ]
机构：
[1] Northeastern Univ, Sch Informat Sci & Engn, Shenyang 110004, Liaoning, Peoples R China
[2] Northeastern Univ, Sch Sci, Shenyang 110004, Liaoning, Peoples R China
[3] NW Inst Nonferrous Met Res, Xian 710016, Shanxi, Peoples R China
来源：
CRYOGENICS | 2010年 / 50卷 / 10期
关键词：
High Tc superconductors; Flux pump; Superconducting magnets; MRI magnets; PERSISTENT CURRENT; NMR MAGNETS; HTS MAGNETS; COMPENSATOR;
D O I：
10.1016/j.cryogenics.2010.06.021
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This paper presents a kind of minitype magnetic flux pump made of high temperature superconductor. This kind of novel high temperature superconducting (HTS) flux pump has not any mechanical revolving parts or thermal switches. The excitation current of copper coils in magnetic pole system is controlled by a singlechip. The structure design and operational principle have been described. The operating performance of the new model magnetic flux pump has been preliminarily tested. The experiments show that the maximum pumping current is approximately 200 A for Bi2223 flux pump and 80 A for MgB2 flux pump operating at 20 K. By comparison, it is discovered that the operating temperature range is wider, the ripple is smaller and the pumping frequency is higher in Bi2223 flux pump than those in MgB2 flux pump. These results indicate that the newly developed Bi2223 magnetic flux pump may efficiently compensate the magnetic field decay in HTS magnet and make the magnet operate in persistent current mode, this point is significant to the magnetic resonance imaging (MRI) magnets. This new flux pump is under construction presently. It is expected that the Bi2223 flux pump would be applied to the superconducting MRI magnets by further optimizing structure and improving working process. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：688 / 692
页数：5
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