Critical persistent current for a loop formed by a Bi-2223 ag-sheathed superconducting tape

Lance Horng, C. H. Tai

Research output: Contribution to journalConference article

11 Citations (Scopus)

Abstract

A persistent current loop formed by a Bi-2223 Ag-sheathed superconducting tape has been fabricated by tape joint technique. The current decay measurement was used to determine the persistent current of the loop at 77K. A dc current exceeding the critical current Ic of the loop defined by 1 μV/cm criterion was transmitted into the loop. The persistent current is found to about 25% of its Ic value of the tape. Based on detailed measurements of the voltage-current curves, the low level resistances down to very low voltage (< 1 nanovolt) at the jointed and unjointed parts were tested, respectively. The jointed section has a larger Ic value of 1 μV/cm criterion than the unjointed one. However, it is found that the persistent current of this test loop is limited by the jointed section, because the residual resistance of the jointed section is larger. These results illustrate that in the jointed section the flux motion is more serious and the weaker grain boundaries or jointing interfaces limits the persistent transport currents.

Original languageEnglish
Pages (from-to)3006-3009
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume11
Issue number1 III
DOIs
Publication statusPublished - 2001 Mar 1
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: 2000 Sep 172000 Sep 22

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Superconducting tapes
Critical currents
Tapes
tapes
critical current
Electric potential
Grain boundaries
Fluxes
low voltage
grain boundaries

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

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Critical persistent current for a loop formed by a Bi-2223 ag-sheathed superconducting tape. / Horng, Lance; Tai, C. H.

In: IEEE Transactions on Applied Superconductivity, Vol. 11, No. 1 III, 01.03.2001, p. 3006-3009.

Research output: Contribution to journalConference article

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N2 - A persistent current loop formed by a Bi-2223 Ag-sheathed superconducting tape has been fabricated by tape joint technique. The current decay measurement was used to determine the persistent current of the loop at 77K. A dc current exceeding the critical current Ic of the loop defined by 1 μV/cm criterion was transmitted into the loop. The persistent current is found to about 25% of its Ic value of the tape. Based on detailed measurements of the voltage-current curves, the low level resistances down to very low voltage (< 1 nanovolt) at the jointed and unjointed parts were tested, respectively. The jointed section has a larger Ic value of 1 μV/cm criterion than the unjointed one. However, it is found that the persistent current of this test loop is limited by the jointed section, because the residual resistance of the jointed section is larger. These results illustrate that in the jointed section the flux motion is more serious and the weaker grain boundaries or jointing interfaces limits the persistent transport currents.

AB - A persistent current loop formed by a Bi-2223 Ag-sheathed superconducting tape has been fabricated by tape joint technique. The current decay measurement was used to determine the persistent current of the loop at 77K. A dc current exceeding the critical current Ic of the loop defined by 1 μV/cm criterion was transmitted into the loop. The persistent current is found to about 25% of its Ic value of the tape. Based on detailed measurements of the voltage-current curves, the low level resistances down to very low voltage (< 1 nanovolt) at the jointed and unjointed parts were tested, respectively. The jointed section has a larger Ic value of 1 μV/cm criterion than the unjointed one. However, it is found that the persistent current of this test loop is limited by the jointed section, because the residual resistance of the jointed section is larger. These results illustrate that in the jointed section the flux motion is more serious and the weaker grain boundaries or jointing interfaces limits the persistent transport currents.

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