Superconducting joint between multi-filamentary Bi2Sr2Ca2Cu3O10+δ tapes based on incongruent melting for NMR and MRI applications

Jin, Xinzhe; Suetomi, Yu; Piao, Rui‐Qi; Matsutake, Yuichi; Yagai, Tsuyoshi; Mochida, H.; Yanagisawa, Yoshinori; Maeda, Hideaki

doi:10.1088/1361-6668/aafc44

Cited by 22 publications

(20 citation statements)

References 31 publications

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“…Considering that the magnet operating current is ∼200 A, the joint critical currents must be >248 A for n = 40, or >266 A for n = 30. The in-field current transport property of the REBCO joint seen in figures 3(a) and (a') provides sufficient performance, while more efforts must be expended in improving the Bi-2223 joint performance [30][31][32].…”

Section: Additional Technical Issues For a Persistent 13 Ghz Lts/hts ...mentioning

confidence: 99%

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Development of a persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

Yanagisawa

Piao

Suetomi

et al. 2021

Supercond. Sci. Technol.

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This paper describes the first persistent-mode medium magnetic field (400 MHz; 9.39 T) nuclear magnetic resonance (NMR) magnet which uses superconducting joints between high-temperature superconductors (HTSs). As the ultimate goal, we aim to develop a high-resolution 1.3 GHz (30.5 T) NMR magnet operated in the persistent-mode. The magnet requires superconducting joints between HTSs and those between an HTS and a low-temperature superconductor (LTS). Towards this goal, we have been developing persistent-mode HTS inner coils to be operated in a 400 MHz (9.39 T) NMR magnet and here we present the first prototype inner coil wound with a single piece (RE = rare earth)Ba2Cu3O7−x (REBCO) conductor. The coil and a REBCO persistent current switch are connected with intermediate grown superconducting joints with high critical currents in external magnetic fields. To evaluate the performance of the joints in an ultimately stable and homogeneous magnetic field, the coil is operated in the persistent-mode, generating 0.1 T, in a 9.3 T background magnetic field of a persistent-mode LTS outer coil. The magnetic field drift over two years of the 400 MHz LTS/REBCO NMR magnet is as small as ∼1 ppm, giving high-resolution NMR spectra. The magnetic field drift rate over the second year was 0.03 × 10−3 ppm h−1, which is more than three orders of magnitude smaller than that required for an NMR magnet, demonstrating that the superconducting joints function satisfactorily in a high-resolution NMR system. The corresponding joint resistance is inferred to be <10−14 Ω.

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Section: Additional Technical Issues For a Persistent 13 Ghz Lts/hts ...mentioning

confidence: 99%

“…In the case of indirect superconducting joint, HTSs are joined by an intermediate superconducting layer [4]. Additionally, an indirect superconducting joint between Bi-2223 conductors [30][31][32] is being developed.…”

Section: Introductionmentioning

confidence: 99%

Development of a persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

Yanagisawa

Piao

Suetomi

et al. 2021

Supercond. Sci. Technol.

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“…The only reported LTS/HTS NMR magnet with an HTS superconducting joint is the 1.3 GHz of the MIRAI program in Japan [7]. Superconducting joints of REBCO and Bi2223 with a resistance lower than 10 −12 Ω have been reported [8][9][10][11]. However, a strong shielding current is observed in the REBCO tape.…”

Section: Introductionmentioning

confidence: 99%

Systematic investigation of a NbTi-Bi2223 hybrid low-resistive joint

Zhang

Sun

Wang

et al. 2023

Supercond. Sci. Technol.

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In this study, a NbTi-Bi2223 hybrid low-resistive joint fabricated by the superconducting solder method was systematically investigated. The joint is a necessary component of gigahertz nuclear magnetic resonance (NMR) with Bi2223 as the insert coil. The joint resistance and current capability under different applied magnetic fields were measured, and the resistance exhibited a near-linear relationship with the applied field. Beyond the superconducting properties, the allowed mechanical criteria for the Bi2223 tape in the joint were also briefly studied. Based on the above two properties, a 1.3-GHz NMR design with a NbTi-Bi2223 hybrid low-resistive joint was shown as an application demonstration. Although the current resistance can fit the magnetic-field decay criteria, obtaining a lower resistance value was attempted by extending the joint length but failed. The main source of the resistance in NbTi-Bi2223 was studied. We attempt to show an engineering-feasible NbTi-Bi2223 hybrid low-resistive joint to help improve the development of gigahertz NMR.

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“…( 1). With recent developments in superconducting joint technology for high-temperature superconducting (HTS) tapes/wires, 2,[7][8][9][10][11][12][13] studies have been published on the evaluation of R j for an HTS closed loop using the current decay method. However, the time dependence of I loop (or the magnetic field trapped in the loop) in these studies did not fit well to Eq.…”

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confidence: 99%

Interpretation of time-dependent current and resistance of HTS closed loop with superconducting joint considering flux creep

Takeda,

Tsuchiya,

Nishijima

2023

Appl. Phys. Express

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A low circuit resistance is required for a superconducting magnet operated in persistent mode using superconducting joints. We performed current decay measurements on a high-temperature superconducting (HTS) closed loop with a superconducting joint to evaluate the time dependence of the current and resistance. The results have been quantitatively explained by considering current sharing and flux creep. After the elapse of 105 s, current sharing was suppressed and a circuit resistance of less than 10−13 Ω was observed. The main finding is that joint resistance of an HTS closed loop is inversely proportional to time, contributing to low circuit resistance.

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Superconducting joint between multi-filamentary Bi₂Sr₂Ca₂Cu₃O_10+δ tapes based on incongruent melting for NMR and MRI applications

Cited by 22 publications

References 31 publications

Development of a persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

Development of a persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

Systematic investigation of a NbTi-Bi2223 hybrid low-resistive joint

Interpretation of time-dependent current and resistance of HTS closed loop with superconducting joint considering flux creep

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