Persistent Current Mode of a 1-T-Class HTS Pancake Coil for NMR/MRI Applications

Kim, Woo-Seok; Lee, Seyeon; Kim, Yungil; Lee, Ji Young; Park, Sang-Ho; Lee, Ji-Kwang; Hong, Gye-Won; Han, Jin-Yi; Choi, Kyeongdal

doi:10.1109/tasc.2014.2376593

Cited by 13 publications

(10 citation statements)

References 5 publications

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“…By choosing different lengths of the split, we can adjust the diameter of the magnet. This ring-shape 2G HTS was inspired by the wind-and-flip method, which was used to construct joint-less 2G HTS coils for NMR/MRI applications [25][26][27][28][29][30][31] and fault current limiters [32,33]. Instead of using one piece of YBCO conductor to wind into coils and applying a DC current, our ring-shape trapped-field magnets use stacks of ring-shape YBCO conductors [34].…”

Section: Introductionmentioning

confidence: 99%

A new ring-shape high-temperature superconducting trapped-field magnet

Sheng

Zhang

Wang

et al. 2017

Supercond. Sci. Technol.

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This paper presents a new type of trapped field magnet made of second generation high temperature superconducting (2G HTS) rings. This so-called ring-shape 2G HTS magnet has the potential to provide much stronger magnetic fields than existing permanent magnets. Compared to existing 2G HTS trapped field magnets, e.g. 2G HTS bulks and stacks, this new ring-shape 2G HTS magnet provides a promising technique to produce lager dimension magnets for industrial applications. This paper focuses on the working mechanism of this new structure magnet, both experimental and numerical study based on commercial magnetization techniques were carried out. Unique features have been identified and quantified for this new type of HTS magnet in field cooling and zero field cooling process. The magnetization mechanism is explained from the view of shielding and penetration of external magnetic field. An accumulation in the trapped field was observed by using multiple pulse field cooling. Besides, three types of demagnetization were also studies to ensure the practical properties of the ring-shape magnets. Conclusions obtained in this paper shows that this new ring-shape HTS magnet is very promising in trapping high magnetic field. As a super permanent magnet, it will have impacts in large-scale industrial applications, e.g. developing HTS machines with very high power density.

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Section: Introductionmentioning

confidence: 99%

A new ring-shape high-temperature superconducting trapped-field magnet

Sheng

Zhang

Wang

et al. 2017

Supercond. Sci. Technol.

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“…The loop-shaped HTS coil made by wind-and-flip winding method [5] - [7] was prepared and provided by W.S. Kim in Korea Polytechnic University.…”

Section: Experimental Details and The Current Division By Different Imentioning

confidence: 99%

“…Therefore, the thermal behaviors of YBCO wires by the heaters were studied experimentally to design the thermal type PCS for NMR relaxometry. In order to investigate the PCM using the developed PCS, the loop-shaped YBCO wire fabricated by wind-and-flip winding method [5]- [7] was prepared and the performances of the developed PCS operating in liquid nitrogen bath were estimated. 2.…”

Section: Introductionmentioning

confidence: 99%

Study on the Persistent Current Switch in HTS Coils Wound with 2G Wire for Compact NMR Magnets

Sugo

Kim²,

Nomura

et al. 2017

J. Phys.: Conf. Ser.

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“…Up to now, there are many joint-less HTS closed coils have been proposed, such as 2G HTS rings, joint-less stacked pancake (JSP) coils, bitter-like HTS magnet, and wind-and-flip coils [6,[8][9][10][11][12][13][14][15][16]. The above coils introduce a novel concept for superconducting magnets with closed-loop operation, which lead to a surge in joint-less coil research [8][9][10][11]17].…”

Section: Introductionmentioning

confidence: 99%

A novel joint-less coil: promising unprecedented magnetic field stability to solve the persistent current mode issue in 2G-HTS magnet application

Dong,

Huang,

Wang

et al. 2023

Supercond. Sci. Technol.

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Closed coils fabricated using second generation high temperature superconducting (2G-HTS) coated conductors (CCs) are promising for superconducting magnets, which operating in persistent current mode (PCM) such as magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) systems. However, the fabrication and application of superconducting joints for 2G-HTS CCs still pose a significant challenge. This paper reports a PCM joint-less 2G-HTS coil for capturing magnetic fields, which is called ‘Four Pancake Coil (FPC)’. A novel winding method was developed to form four pancake structure and effectively solved the closed-loop problem of 2G-HTS magnets. Meanwhile, the FPCs generated a 70.4 mT central magnetic field at 77 K and lasted for 57 d with a magnetic field drift rate of only 0.065 ppm h−1, which can satisfy the requirements of MRI magnets. In addition to the closed-loop characteristics of the FPC, the stacked magnet also provides expandability and ease of maintenance exchange. These advantages make it highly promising for the development of closed-loop 2G-HTS magnets.

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Persistent Current Mode of a 1-T-Class HTS Pancake Coil for NMR/MRI Applications

Cited by 13 publications

References 5 publications

A new ring-shape high-temperature superconducting trapped-field magnet

A new ring-shape high-temperature superconducting trapped-field magnet

Study on the Persistent Current Switch in HTS Coils Wound with 2G Wire for Compact NMR Magnets

A novel joint-less coil: promising unprecedented magnetic field stability to solve the persistent current mode issue in 2G-HTS magnet application

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