Measurement of Magnetic Field Properties of a 3.0 T/m Air-core HTS Quadrupole Magnet and Optimal Shape Design to Increase the Critical Current Reduced by the Incident Magnetic Field
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electronics-09-00450.pdf
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Author(s)
Choi, Yojong
Kim, Junseong
Baek, Geonwoo
Han, Seunghak
Lee, Seung Woo
Ko, Tae Kuk
Date Issued
March 2020
Journal
Electronics
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Choi, Yojong, et al. "Measurement of Magnetic Field Properties of a 3.0 T/m Air-Core HTS Quadrupole Magnet and Optimal Shape Design to Increase the Critical Current Reduced by the Incident Magnetic Field ." Electronics, 9 (March 2020), 450. © 2020 The Author(s)
Version
Final published version
Abstract
Air-core high-temperature superconducting quadrupole magnets (AHQMs) differ from conventional iron-core quadrupole magnets, in that their iron cores are removed, and instead high-temperature superconductors (HTSs) are applied. The high operating temperature and high thermal stability of HTS magnets can improve their thermodynamic cooling efficiency. Thus, HTS magnets are more suitable than low temperature superconducting magnets for withstanding radiation and high heat loads in the hot cells of accelerators. AHQMs are advantageous because they are compact, light, and free from the hysteresis of ferromagnetic materials, due to the removal of the iron-core. To verify the feasibility of the use of AHQMs, we designed and fabricated a 3.0 T/m AHQM. The magnetic field properties of the fabricated AHQM were evaluated. Additionally, the characteristics of the air-core model and iron-core model of 9.0 T/m were compared in the scale for practical operation. In comparison with the iron-core model, AHQM significantly reduces the critical current (I[subscript C]) due to the strong magnetic field inside the coil. In this study, a method for the accurate calculation of I[subscript C] is introduced, and the calculated results are compared with measured results. Furthermore, the optimal shape design of the AHQM to increase the critical current is introduced. Keywords: air-core quadrupole magnet; critical current degradation; heavy-lon accelerator; high-temperature superconductor; iron-core quadrupole magnet; optimum shape design
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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DOI of Published Version
https://doi.org/10.3390/electronics9030450
