학술논문
Characterization of In-Field Critical Currents in REBCO Tapes Over Wide Temperature Range by Pulsed Current Source With Supercapacitor
Document Type
Periodical
Author
Source
IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 34(5):1-7 Aug, 2024
Subject
Language
ISSN
1051-8223
1558-2515
2378-7074
1558-2515
2378-7074
Abstract
The field and temperature dependence of the critical current I c is a vital factor in designing the superconducting magnets. The standard method of measuring I c involves applying a dc current and measuring voltage. However, when assessing the field dependence of I c , 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 I c 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 I c 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 I c values of full width samples with those of samples containing micro-bridges.