Analysis of magnetic field harmonics change due to manufacturing error in air-core HTS quadruple magnet

Kim, Junseong; Baek, Geonwoo; Lee, Jeyull; Choi, Yojong; Han, Seunghak; Song, Seunghyun; Ko, Tae Kuk

doi:10.1016/j.cryogenics.2018.07.002

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…Additionally, considering the temperature rise of the HTS coil due to radiation heating, the iron-core model, air-core model (case #1) and air-core model (case #2) have temperature margins of 7.4, 0.6 and 6.6 K, respectively. Electronics 2020, 9,450 19 of 22…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…The measured magnetic fields were converted to the radial direction components B ρ by performing calculations in the cartesian coordinate system to the cylindrical coordinate system. Electronics 2020, 9,450 6 of 22 (a) (b) Figure 4a shows the measured and calculated Bρ values for each azimuthal angle at the z position in the negative direction, and Figure 4b shows the measured and calculated Bρ values for each azimuthal angle at the z position in the positive direction. The measurement results were found to agree well with the calculation results; however, errors were found at the z positions of 100 mm and 120 mm.…”

Section: Experimental Setup For the Magnetic Field Measurement Of Thementioning

confidence: 99%

“…Electronics 2020, 9,450 13 of 22 Figure 12. Magnetic field properties of the designed air-core HTS quadrupole magnet with respect to operating current.…”

Section: Comparison Of Air-core and Iron-core Of 90 T/m Hts Quadrupomentioning

confidence: 99%

“…The maximum Lorenz force of the air-core model and the iron-core model is calculated at 341,250 MN/mm 3 , respectively, and the maximum von Mises stress of the coil in the air-core model is 4.09 MPa higher than that of the iron-core model. The yield stress of an HTS coil containing co-winded stainless steel (AISI 304) as insulation is estimated to be 400 MPa [9]. Therefore, both models have enough margin for the yield strength of the HTS coil.…”

Section: Comparison Of Air-core and Iron-core Of 90 T/m Hts Quadrupomentioning

confidence: 99%

“…Therefore, a new quadrupole magnet has been proposed with two differences [8]: replacing the LTS with the HTS wires, and removing the iron-core. As an initial study to replace the existing quadrupole magnets, the effects of the manufacturing error, and the comparison of the characteristics with the iron core, were performed [9,10]. However, no case has been reported on the construction and operation of quadrupole magnets using HTS wires detached from the iron-core.…”

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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

et al. 2020

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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 C ) due to the strong magnetic field inside the coil. In this study, a method for the accurate calculation of I 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.Electronics 2020, 9, 450 2 of 22 Because of these advantages, including the thermal stability of HTS, as an example, it has been reported that in the Rare Isotope Science Project for the construction of a heavy-ion accelerator called RAON in Korea, six HTS quadrupole magnets will be installed in succession for beam focusing at the front region of the IF pre-separator [7]. Additionally, HTS quadrupole magnets using air-cores have many advantages for heavy-ion accelerator applications, because of the elimination of the iron-core of the conventional HTS quadrupole magnet. Quadrupole magnets with a removed iron-core are advantageous because of their compactness and lightweight, and they are free from the hysteresis of ferromagnetic materials. Therefore, a new quadrupole magnet has been proposed with two differences [8]: replacing the LTS with the HTS wires, and removing the iron-core. As an initial study to replace the existing quadrupole magnets, the effects of the manufacturing error, and the comparison of the characteristics with the iron core, were performed [9,10]. However, no case has been reported on the construction and operation of quadrupole magnets using HTS wires detached from the iron-core. Therefore, research should precede the manufacturing of air-core quadrupole magnets, and the analysis of the magnetic field properties based on the magnetic field measurements. To verify the feasibility of the air-core HTS quadrupole magnet, we designed and fabricated an air-core high-temperature superconducting quadrupole magnet with a field gradient of 3.0 T/m, an effective length of more than 200 mm, and a uniformity of less than 1%. We also fabricated a field mapper to measure the field quality of ...

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Experimental Setup For the Magnetic Field Measurement Of Thementioning

confidence: 99%

“…Electronics 2020, 9,450 13 of 22 Figure 12. Magnetic field properties of the designed air-core HTS quadrupole magnet with respect to operating current.…”

Section: Comparison Of Air-core and Iron-core Of 90 T/m Hts Quadrupomentioning

confidence: 99%

Section: Comparison Of Air-core and Iron-core Of 90 T/m Hts Quadrupomentioning

confidence: 99%

mentioning

confidence: 99%

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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

et al. 2020

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A Novel Magnetic Field Active Shim Method for Air-Core High-Temperature Superconducting Quadruple Magnet

Kim

Baek

Lee

et al. 2019

IEEE Trans. Appl. Supercond.

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Experimental Test of the Magnetic Field Active Shimming Method for Air-Core HTS Quadruple Magnet

Kim¹,

Choi²,

Lee³

et al. 2020

IEEE Trans. Appl. Supercond.

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Analysis of magnetic field harmonics change due to manufacturing error in air-core HTS quadruple magnet

Cited by 3 publications

References 8 publications

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

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

A Novel Magnetic Field Active Shim Method for Air-Core High-Temperature Superconducting Quadruple Magnet

Experimental Test of the Magnetic Field Active Shimming Method for Air-Core HTS Quadruple Magnet

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