E-J characteristic of 2G YBCO coated conductor tapes at different temperatures
E-J characteristic of 2G YBCO coated conductor tapes at different temperatures
The E-J characteristics of High temperature superconducting (HTS) composite are not only fundamental to the understanding of flux dynamics and flux pinning but also the quench behaviour of HTS at an extended temperature range. The present work present the E-J characteristics of state-of-the-art 2G YBCO Tapes of SuperPowerTM measured at different temperatures between 40K and 80K. The results revealed a appreciable deviation from the power-law E-J characteristics, an established framework for 1G 2223 conductors. In contrast, the equivalent power exponent n was found to decrease with increasing current, resulting in a reduced rate for the non-linear increase of voltage at higher current. The softening of E-J characteristic remain unchanged as the temperature is lowered. Furthermore the power exponent n at the critical current appears to be constant increasing at lower temperatures. Analysis presented in the work shows that the collective pinning of vortex glass gives a satisfactory quantitative description of the E-J characteristics of 2G YBCO tapes. A constant collective pinning potential U/kBT ? 15 and vortex glass exponent ? ? 2 were found for temperatures between 45 K and 80 K
1462-1467
Falorio, I.
65afc7a9-336b-4cce-a034-0c37df06e2c4
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
8 September 2012
Falorio, I.
65afc7a9-336b-4cce-a034-0c37df06e2c4
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Falorio, I., Young, E.A. and Yang, Y.
(2012)
E-J characteristic of 2G YBCO coated conductor tapes at different temperatures.
Physics Procedia, 36, .
(doi:10.1016/j.phpro.2012.06.115).
Abstract
The E-J characteristics of High temperature superconducting (HTS) composite are not only fundamental to the understanding of flux dynamics and flux pinning but also the quench behaviour of HTS at an extended temperature range. The present work present the E-J characteristics of state-of-the-art 2G YBCO Tapes of SuperPowerTM measured at different temperatures between 40K and 80K. The results revealed a appreciable deviation from the power-law E-J characteristics, an established framework for 1G 2223 conductors. In contrast, the equivalent power exponent n was found to decrease with increasing current, resulting in a reduced rate for the non-linear increase of voltage at higher current. The softening of E-J characteristic remain unchanged as the temperature is lowered. Furthermore the power exponent n at the critical current appears to be constant increasing at lower temperatures. Analysis presented in the work shows that the collective pinning of vortex glass gives a satisfactory quantitative description of the E-J characteristics of 2G YBCO tapes. A constant collective pinning potential U/kBT ? 15 and vortex glass exponent ? ? 2 were found for temperatures between 45 K and 80 K
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Published date: 8 September 2012
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Engineering Science Unit
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Local EPrints ID: 377390
URI: http://eprints.soton.ac.uk/id/eprint/377390
PURE UUID: e5fea21c-25aa-4cda-838e-b6e272940fc5
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Date deposited: 04 Jun 2015 08:59
Last modified: 15 Mar 2024 02:45
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I. Falorio
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