Prototype HTS Quadrupole Magnet for the In-Flight Fragment Separator of RISP

Jo, Hyun Chul; Kim, Do-Gyun; Choi, Sukjin; Jang, Hyun Man; Sim, Kideok; Kim, Seokho

doi:10.1109/tasc.2018.2836948

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…The magnetic field for the azimuthal angle, measured at the reference radius, is the main component in which the secondary harmonics is used for focusing the beams of the quadrupole magnet. The magnetic field properties of the quadrupole magnet are generally evaluated using three factors-gradient, uniformity and effective length-which are represented using Equations (4)- (6), respectively [20].…”

Section: Harmonic Coefficients and Major Magnetic Propertiesmentioning

confidence: 99%

“…The prototype HTS iron-core quadrupole magnet for HQ4 in the IF separator was designed and fabricated by IBS and KERI. Prototype HTS quadrupole magnets have been reported to have been successfully fabricated and tested [6]. We designed an air-core quadrupole magnet that meets the same requirements to compare the characteristics of the air-core and iron-core models.…”

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

confidence: 99%

“…In comparison with LTSs operating in a liquid helium environment, the high operating temperature and high thermal stability of high-temperature superconductors (HTSs) can improve the thermodynamic cooling efficiency [4]. The removal of the heat load at 40 K is approximately 10 times more efficient than that at 4-5 K [5,6]. Thus, HTS magnets are more suitable than LTS magnets in withstanding radiation and high heat loads in the hot cells of accelerators.…”

Section: Introductionmentioning

confidence: 99%

“…The calculated critical current was compared to the measured critical current using a 3.0 T/m HTS quadrupole magnet, in order to ensure the reliability of the calculated critical current, and it was confirmed that it fits well. Recently, a prototype of a 9.0 T/m HTS quadrupole magnet using iron-core was developed and tested at the Institute for Basic Science (IBS) and Korea Electrotechnology Research Institute (KERI) [6]. We designed a 9.0 T/m class air-core HTS quadrupole magnet with the same specifications as the iron-core HTS quadrupole magnet, and the differences between the air-core model and the iron-core model were compared.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in applications using HTS wires, the lowest critical current in all sections is evaluated as the critical current of the entire magnet, because the magnet is continuously winding the HTS tape. Therefore, in general, while predicting the critical current of superconducting magnets, including iron-core quadrupole magnets, only the perpendicular magnetic field is considered [6,7,10]. However, the recently developed 2G HTS tapes have different critical current characteristics than those of conventional 2G HTS tapes, because of the introduction of an artificial pinning center to improve its magnetic field performance [17,18].…”

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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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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: Harmonic Coefficients and Major Magnetic Propertiesmentioning

confidence: 99%

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

confidence: 99%