Effect of Screening Current Induced Field on Field Quality of an Air-Core HTS Quadrupole Magnet

Geonwoo Baek; Junseong Kim; Seunghak Han; Yong Soo Yoon; Sangjin Lee; Tae Kuk Ko

doi:10.1109/TASC.2020.2979842

Effect of Screening Current Induced Field on Field Quality of an Air-Core HTS Quadrupole Magnet

Geonwoo Baek, Junseong Kim, Seunghak Han, Yong Soo Yoon, Sangjin Lee, Tae Kuk Ko

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

An air-core high-temperature superconducting (HTS) quadrupole magnet has many advantages for heavy-ion accelerator applications due to the elimination of the iron-core of a conventional HTS quadrupole magnet. It is compact, lightweight, and free of hysteresis of a ferromagnetic material. In our previous study, an air-core HTS quadrupole magnet of 3.0 T/m field gradient was designed. It was composed of eight double-pancake racetrack coils, each wound using 4-mm wide HTS tapes. In the magnet design, a uniform current density was assumed in the HTS tapes. However, in the HTS racetrack coils, magnetization currents are induced by the magnetic field component perpendicular to the tapes, and the magnetization currents generate the so-called screening current induced field (SCIF). For the quadrupole magnet, the SCIF could be critical to the field quality of the magnet. In this study, the current density distribution was calculated considering the magnetization current. Furthermore, the effect of the SCIF on the field quality of the magnet is analyzed and discussed.

Original language	English
Article number	9031392
Journal	IEEE Transactions on Applied Superconductivity
Volume	30
Issue number	4
DOIs	https://doi.org/10.1109/TASC.2020.2979842
Publication status	Published - 2020 Jun

Bibliographical note

Funding Information:
Manuscript received September 20, 2019; accepted March 2, 2020. Date of publication March 10, 2020; date of current version April 8, 2020. This work was supported in part by Korea Electric Power Corporation under Grant R17XA05_32 and in part by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning, granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea under Grant 20184030202270. (Corresponding author: Tae Kuk Ko.) Geonwoo Baek, Junseong Kim, Seunghak Han, and Tae Kuk Ko are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: bgw03@naver.com; tkko@yonsei.ac.kr).

Publisher Copyright:
© 2002-2011 IEEE.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2020.2979842

Cite this

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title = "Effect of Screening Current Induced Field on Field Quality of an Air-Core HTS Quadrupole Magnet",

abstract = "An air-core high-temperature superconducting (HTS) quadrupole magnet has many advantages for heavy-ion accelerator applications due to the elimination of the iron-core of a conventional HTS quadrupole magnet. It is compact, lightweight, and free of hysteresis of a ferromagnetic material. In our previous study, an air-core HTS quadrupole magnet of 3.0 T/m field gradient was designed. It was composed of eight double-pancake racetrack coils, each wound using 4-mm wide HTS tapes. In the magnet design, a uniform current density was assumed in the HTS tapes. However, in the HTS racetrack coils, magnetization currents are induced by the magnetic field component perpendicular to the tapes, and the magnetization currents generate the so-called screening current induced field (SCIF). For the quadrupole magnet, the SCIF could be critical to the field quality of the magnet. In this study, the current density distribution was calculated considering the magnetization current. Furthermore, the effect of the SCIF on the field quality of the magnet is analyzed and discussed.",

author = "Geonwoo Baek and Junseong Kim and Seunghak Han and Yoon, {Yong Soo} and Sangjin Lee and Ko, {Tae Kuk}",

note = "Funding Information: Manuscript received September 20, 2019; accepted March 2, 2020. Date of publication March 10, 2020; date of current version April 8, 2020. This work was supported in part by Korea Electric Power Corporation under Grant R17XA05_32 and in part by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning, granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea under Grant 20184030202270. (Corresponding author: Tae Kuk Ko.) Geonwoo Baek, Junseong Kim, Seunghak Han, and Tae Kuk Ko are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: bgw03@naver.com; tkko@yonsei.ac.kr). Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",

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N1 - Funding Information: Manuscript received September 20, 2019; accepted March 2, 2020. Date of publication March 10, 2020; date of current version April 8, 2020. This work was supported in part by Korea Electric Power Corporation under Grant R17XA05_32 and in part by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning, granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea under Grant 20184030202270. (Corresponding author: Tae Kuk Ko.) Geonwoo Baek, Junseong Kim, Seunghak Han, and Tae Kuk Ko are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: bgw03@naver.com; tkko@yonsei.ac.kr). Publisher Copyright: © 2002-2011 IEEE.

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N2 - An air-core high-temperature superconducting (HTS) quadrupole magnet has many advantages for heavy-ion accelerator applications due to the elimination of the iron-core of a conventional HTS quadrupole magnet. It is compact, lightweight, and free of hysteresis of a ferromagnetic material. In our previous study, an air-core HTS quadrupole magnet of 3.0 T/m field gradient was designed. It was composed of eight double-pancake racetrack coils, each wound using 4-mm wide HTS tapes. In the magnet design, a uniform current density was assumed in the HTS tapes. However, in the HTS racetrack coils, magnetization currents are induced by the magnetic field component perpendicular to the tapes, and the magnetization currents generate the so-called screening current induced field (SCIF). For the quadrupole magnet, the SCIF could be critical to the field quality of the magnet. In this study, the current density distribution was calculated considering the magnetization current. Furthermore, the effect of the SCIF on the field quality of the magnet is analyzed and discussed.

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Effect of Screening Current Induced Field on Field Quality of an Air-Core HTS Quadrupole Magnet

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