Critical currents in long-length YBCO-coated conductors

Usoskin, A.; Dzick, J.; Issaev, A.; Knoke, J.; García‐Moreno, Francisco; Sturm, K.; Freyhardt, H.C.

doi:10.1088/0953-2048/14/9/308

Cited by 41 publications

(14 citation statements)

References 5 publications

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“…Recently, long-length YBCO coated-conductor tapes with good superconductivity are commercially manufactured. This improvement was accomplished by using various vapor deposition methods and various novel substrate and buffer layers [1][2][3][4][5][6][7][8] . However, the potential for operation at elevated temperatures such as liquid nitrogen temperature and high magnetic fields is restricted.…”

mentioning

confidence: 99%

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Choi

Ahmad

Seo

et al. 2020

Sci Rep

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We investigate changes in the vortex pinning mechanism caused by proton irradiation through the measurement of the in-plane electrical resistivity for H//c in a pristine and two proton-irradiated (total doses of 1 × 1015 and 1 × 1016 cm−2) SmBa2Cu3O7-δ (SmBCO) superconducting tapes. Even though proton irradiation has no effect on the critical temperature (Tc), the resulting artificial point defect causes an increase in normal state electrical resistivity. The electrical resistivity data around Tc shows no evidence of a phase transition to the vortex glass state but only broadens with increasing magnetic field due to the vortex depinning in the vortex liquid state. The vortex depinning is well interpreted by a thermally activated flux flow model in which the activation energy shows a nonlinear temperature change $${\boldsymbol{U}}{\boldsymbol{(}}{\boldsymbol{T}},{\boldsymbol{H}}{\boldsymbol{)}}{\boldsymbol{=}}{{\boldsymbol{U}}}_{{\boldsymbol{0}}}{\boldsymbol{(}}{\boldsymbol{H}}{\boldsymbol{)}}{{\boldsymbol{(}}{\bf{1}}-{\boldsymbol{T}}{\boldsymbol{/}}{{\boldsymbol{T}}}_{{\boldsymbol{c}}}{\boldsymbol{)}}}^{{\boldsymbol{q}}}$$U(T,H)=U0(H)(1−T/Tc)q (q = 2). The field dependence of activation energy shows a $${{\boldsymbol{U}}}_{{\bf{0}}}{\boldsymbol{ \sim }}{{\boldsymbol{H}}}^{-{\boldsymbol{\alpha }}}$$U0~H−α with larger exponents above 4 T. This field dependence is mainly due to correlated disorders in pristine sample and artificially created point defects in irradiated samples. Compared with the vortex pinning due to correlated disorders, the vortex pinning due to the appropriate amount of point defects reduces the magnitude of Uo(H) in the low magnetic field region and slowly reduces Uo(H) in high magnetic fields.

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confidence: 99%

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Choi

Ahmad

Seo

et al. 2020

Sci Rep

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“…The resulting Y123 materials demonstrate an improvement in critical current density of the superconducting phase when compared with solid-state syntheses, 32,33 and act as proof-of-concept that GO can be used as a template for complex oxides.…”

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confidence: 90%

Graphene oxide as a template for a complex functional oxide

et al. 2015

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“…The coated conductors used in these experiments are based on the IBAD-YSZ processing route [15]. The substrate is Cr-Ni stainless steel, 100 µm in thickness.…”

Section: Coated Conductormentioning

confidence: 99%

DC superconducting fault current limiter

Tixador¹,

Villard²,

Cointe³

2006

Supercond. Sci. Technol.

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There is a lack of satisfying solutions for fault currents using conventional technologies, especially in DC networks, where a superconducting fault current limiter could play a very important part. DC networks bring a lot of advantages when compared to traditional AC ones, in particular within the context of the liberalization of the electric market. Under normal operation in a DC network, the losses in the superconducting element are nearly zero and only a small, i.e. a low cost, refrigeration system is then required. The absence of zero crossing of a DC fault current favourably accelerates the normal zone propagation. The very high current slope at the time of the short circuit in a DC grid is another favourable parameter. The material used for the experiments is YBCO deposited on Al 2 O 3 as well as YBCO coated conductors. The DC limitation experiments are compared to AC ones at different frequencies (50-2000 Hz). Careful attention is paid to the quench homogenization, which is one of the key issues for an SC FCL. The University of Geneva has proposed constrictions. We have investigated an operating temperature higher than 77 K. As for YBCO bulk, an operation closer to the critical temperature brings a highly improved homogeneity in the electric field development. The material can then absorb large energies without degradation. We present tests at various temperatures. These promising results are to be confirmed over long lengths.

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Critical currents in long-length YBCO-coated conductors

Cited by 41 publications

References 5 publications

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Graphene oxide as a template for a complex functional oxide

DC superconducting fault current limiter

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