Progress in Thick Film 2G-HTS Development

Majkic, Goran

doi:10.1007/978-3-030-23303-7_4

Cited by 5 publications

(8 citation statements)

References 112 publications

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“…This result shows that the inhomogeneous quench regime can generate very high temperature gradients in the HTS tape. As the critical current of commercial HTS tapes keeps increasing [19], these temperature gradients are likely to become larger and larger, which can become a challenge for ensuring the integrity of the HTS tapes. We note that, in our numerical simulations, we did not include the variations of the silver layer thickness along the length.…”

Section: Numerical Resultsmentioning

confidence: 99%

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Lacroix¹,

Lavergne²,

Leduc³

et al. 2021

Supercond. Sci. Technol.

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High-voltage direct current transmission systems are expected to allow the transmission of huge volumes of electricity over long distances. The use of superconducting fault current limiters (SFCLs) based on second-generation (2G) high-temperature superconductor (HTS) coated conductors (CCs) is a promising solution to mitigate fault currents in DC transmission systems. To fabricate a SFCL whose size remains acceptable, which means minimizing the length of the HTS tape used, the tape must sustain a high electric field during the whole fault duration. In this paper, high performance commercial 2G HTS CCs from THEVA (more than 750 A/cm-width at 77 K in self-field), on which a 500 µm thick Hastelloy shunt was soldered, were tested by submitting them to faults of different amplitudes and durations. Measurements revealed that these HTS tapes could sustain any type of fault up to 100 V m−1, lasting up to 50 ms. Three-dimensions finite element simulations were able to reproduce accurately the experiments by using the appropriate temperature dependence of the critical current density and power law index, and by accounting for the variations in the local critical current along the length of the HTS tapes.

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Section: Numerical Resultsmentioning

confidence: 99%

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Lacroix¹,

Lavergne²,

Leduc³

et al. 2021

Supercond. Sci. Technol.

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“…All REBCO/BZO samples have been grown on flexible hastelloy substrates capped with a buffer layer consisting of Al 2 O 3 /Y 2 O 3 /IBAD-MgO/homo-epi MgO/LaMnO 3 film stack [77,78]. The films have been deposited using the newly developed advanced metal-organic chemical vapor deposition (A-MOCVD), system that enables growth of very thick films (up to 5 µm) of high texture quality throughout the thickness [1,3,5,13,60,79]. Metal-tetra methylheptanedionate precursors have been used with tetrahydrofuran as a solvent.…”

Section: Methodsmentioning

confidence: 99%

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

Majkic

Jeong

Yun

et al. 2021

Supercond. Sci. Technol.

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We report on strain and composition effects associated with growth of self-assembled BaZrO 3 (BZO) nanorods in REBa 2 Cu 3 O 7−δ (REBCO) superconductors (RE = rare earth = Y and Gd), which have a profound effect on flux pinning and in-field critical current performance. The a-b plane mismatch between BZO and REBCO is never fully coherently accommodated. Instead, the nanorods always assume a size at least one unit cell smaller than the corresponding 'hole' in the REBCO matrix, thus providing deep minima of in-plane mismatch strain. Next, we show that the nominal BZO nanorods are in fact solid solution Ba 2+ (Zr 4+ 1−z RE 3+ z )O 3−δ perovskite, thus strongly affecting the stoichiometry and relative amounts of REBCO and BZO. We demonstrate that by varying only the Ba content in the nominal composition of 15 mol.% BZO + REBCO, the unit cell density of BZO can be tuned from 5% to 23%, and the linear density of RE 2 O 3 (REO) precipitates from 18 to 1 µm −1 . The results explain the wide range of pinning performances observed for the same nominal amount of Zr addition and provide insight into the mechanisms behind the complex phenomenon of growth of nanorods by self-assembly in REBCO superconductors.

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“…The control of the YBCO layer thickness is crucial as it significantly influences the desired crystalline quality and overall performance of the film [3,[29][30][31][32]. Specifically, the electron mean free path plays a critical role in determining the selffield critical current density, J c (0), similar to its effect on the critical temperature [7,33,34].…”

Section: Introductionmentioning

confidence: 99%

“…These factors indicate the existence of an optimal layer thickness beyond which the crystalline structure continuously deteriorates. The relationship between film thickness and selffield critical current density has been extensively discussed in previous literature [3,32]. While there may be slight variations in estimating the rate of reduction of J c (0) with film thickness, particularly for very thin films, there is a clear consensus that J c (0) consistently decreases as film thickness increases.…”

Section: Introductionmentioning

confidence: 99%

Defining optimal thickness for maximal self-field Jc in YBCO/CeO₂ multilayers grown on buffered metal

Tuomola,

Rivasto,

Aye

et al. 2023

J. Phys.: Condens. Matter

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The eﬀect of multilayering YBa2Cu3O6+x (YBCO) thin ﬁlms with sequentially deposited CeO2 layers between YBCO layers grown on buﬀered metallic template is investigated to optimize the self-ﬁeld critical current density J c(0). We have obtained that the improvement in J c(0) clearly depends on the YBCO layer thickness and temperature, where at high temperature J c(0) can be increased even 50 % when compared with the single layer YBCO ﬁlms. Based on our experimental results and theoretical approach to the growth mechanism during multilayer deposition, we have deﬁned a critical thickness for the YBCO layer, where the maximal self-ﬁeld J c(0) is strongly related to the competing issues between the uniform and nonuniform strain relaxation and the formation of dislocations and other defects during the ﬁlm growth. Our results can be directly utilized in the future coated conductor technology, when maximizing the overall in-ﬁeld J c(B) by combining both the optimal crystalline quality and ﬂux pinning properties typically in bilayer ﬁlm structures.

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Progress in Thick Film 2G-HTS Development

Cited by 5 publications

References 112 publications

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

Defining optimal thickness for maximal self-field Jc in YBCO/CeO₂ multilayers grown on buffered metal

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Progress in Thick Film 2G-HTS Development

Cited by 5 publications

References 112 publications

Successful DC current limitation above 100 Vm−1 for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Successful DC current limitation above 100 Vm−1 for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

New insight into strain and composition of BaZrO3 nanorods in REBCO superconductor

Defining optimal thickness for maximal self-field Jc in YBCO/CeO2 multilayers grown on buffered metal

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Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

Successful DC current limitation above 100 Vm⁻¹ for 50 ms using HTS tapes with critical currents exceeding 750 A/cm-width

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

Defining optimal thickness for maximal self-field Jc in YBCO/CeO₂ multilayers grown on buffered metal