Characterization of In-Field Critical Currents in REBCO Tapes Over Wide Temperature Range by Pulsed Current Source With Supercapacitor - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue IEEE Transactions on Applied Superconductivity Année : 2024

Characterization of In-Field Critical Currents in REBCO Tapes Over Wide Temperature Range by Pulsed Current Source With Supercapacitor

Y. Tsuchiya
Y. Kohama
Alexandre Zampa
T. Okada
S. Awaji

Résumé

The field and temperature dependence of the critical current Ic is a vital factor in designing the superconducting magnets. The standard method of measuring Ic involves applying a DC current and measuring voltage. However, when assessing the field dependence of Ic, the high magnetic field's space constraints and cooling power limit the injection of DC current into the sample. To address this, we have developed a method using pulsed current to significantly reduce heat generation. Our previous research reported an Ic measurement system capable of handling up to 19 T and variable temperatures with a pulse current up to 500 A. In this study, we have enhanced the system with electric double layer capacitors, known as supercapacitors, allowing currents up to 2 kA. This upgrade enables the measurement of Ic in the high-temperature superconducting REBCO tapes, which are 4 mm wide, at cryogenic temperatures as low as 4.2 K in magnetic fields or 20 K even under a self-field. We have verified the system's reliability by comparing measurements of DC and pulsed currents. Additionally, we contrasted the Ic values of full width samples with those of samples containing micro-bridges.
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hal-04440446 , version 1 (06-02-2024)

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Y. Tsuchiya, K. Mizuno, Y. Kohama, Alexandre Zampa, T. Okada, et al.. Characterization of In-Field Critical Currents in REBCO Tapes Over Wide Temperature Range by Pulsed Current Source With Supercapacitor. IEEE Transactions on Applied Superconductivity, 2024, 34 (5), pp.1-7. ⟨10.1109/TASC.2023.3343670⟩. ⟨hal-04440446⟩
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