Transport current losses in HoBaCuO-123 coated conductors with a Ni-alloy substrate

Tsukamoto, O.; Nakayama, Hiroyuki; Odaka, S.; Ciszek, M.; Hahakura, S.; Ueyama, M.; Ohmatsu, K.; Miyagi, Daisuke

doi:10.1016/j.physc.2005.03.078

Cited by 30 publications

(16 citation statements)

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“…curves become close to the Norris elliptic curve at Those results were also observed in other HoBCO CC's with magnetic substrates [3], [4], [6]. The results that the loss curves are close to the Norris elliptic curve at to 1 T indicates that in the side edge area of the tape-shaped conductors is lower than those in the center areas of the conductors [6], [9].…”

Section: ) Critical Current Vs Magnetic Fieldsupporting

confidence: 81%

“…But the problem is, as reported so far, the presence of magnetic substrate affects the AC losses in the superconductors. Especially, AC transport current losses increase significantly compared with those in CC's with non-magnetic substrates [3]- [6]. In the present work, we studied the AC loss characteristics in a stack of a pair of HoBaCuO-123 CC's with Ni-alloy substrates to study a method to suppress the AC losses.…”

Section: Introductionmentioning

confidence: 99%

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AC Loss Characteristics of Stacked Conductors Composed of HTS Coated Conductors With Magnetic Substrates

Tsukamoto

Alamgir

Liu

et al. 2007

IEEE Trans. Appl. Supercond.

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HTS coated conductors (CC's) with substrates of magnetic materials such as Ni-alloys are expected to be promising for practical applications because Ni-alloys are well-texturized by simple processes and production costs of the conductors are significantly reduced. In the former works, it was shown by experiments that HoBaCuO-123 CC's with Ni-alloy substrates exhibit higher AC transport current losses than CC's with non-magnetic Hastelloy substrates. In this work, the AC transport current loss characteristics of stacked conductors composed of a pair of HoBCO CC's with Ni-alloy substrates are experimentally investigated to study a method to suppress the AC transport current losses. It is found that AC transport current losses can be reduced in the stack arrangement by the minimization of influence of the magnetism of the substrates canceling self-fields in the substrates.

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Section: ) Critical Current Vs Magnetic Fieldsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

AC Loss Characteristics of Stacked Conductors Composed of HTS Coated Conductors With Magnetic Substrates

Tsukamoto

Alamgir

Liu

et al. 2007

IEEE Trans. Appl. Supercond.

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“…[21][22][23] The dependence of ferromagnetic loss on applied magnetic field is measured from magnetization hysteresis of a HTS tape in a superconducting quantum interference device ͑SQUID͒ magnetometer at T Ͼ T c . For example, the dependence of ferromagnetic loss on applied field amplitude for a Ni5%W substrate with dimensions of 1 cm width and 75 m thickness is shown in Fig.…”

Section: Ferromagnetic Loss In the Substratementioning

confidence: 99%

Numerical calculations of the total ac loss of Cu-stabilized YBa2Cu3O7−δ coated conductor with a ferromagnetic substrate

Nguyen

Pamidi

Schwartz

2007

Journal of Applied Physics

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A numerical model is developed to calculate the total alternating-current (ac) loss of Cu-stabilized YBa2Cu3O7−δ (YBCO) coated conductors with a ferromagnetic substrate when carrying an alternating transport current in an ac background magnetic field. The time evolutions of current and magnetic field distributions along the width of the conductor are calculated by solving the one-dimensional Poisson equation for the magnetic vector potential. In addition to the ac loss dissipated in the superconducting layer, the ferromagnetic loss in the substrate and eddy current loss in the Cu stabilizer are also modeled. In the calculations, the superconducting voltage-current behavior is assumed to follow a power law. The model is capable of addressing other practical aspects of YBCO conductors, including the field dependence of the critical current density, and n value, and nonuniformities in the conductor. The magnetic shielding of the ferromagnetic substrate, however, was ignored in the calculations. Numerical results are compared with analytical and experimental results for some special cases.

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“…However, it has been reported that the magnetic property of the substrate strongly affects the AC transport current losses [1,2]. In the previous study, it was shown that the magnetism of the substrate affects the AC transport current loss using the finite element method (FEM).…”

Section: Introductionmentioning

confidence: 99%

Measurement of magnetic properties of Ni-alloy substrate of HTS coated conductor in LN2

Miyagi

Yunoki

Umabuchi

et al. 2008

Physica C: Superconductivity

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Transport current losses in HoBaCuO-123 coated conductors with a Ni-alloy substrate

Cited by 30 publications

References 0 publications

AC Loss Characteristics of Stacked Conductors Composed of HTS Coated Conductors With Magnetic Substrates

AC Loss Characteristics of Stacked Conductors Composed of HTS Coated Conductors With Magnetic Substrates

Numerical calculations of the total ac loss of Cu-stabilized YBa2Cu3O7−δ coated conductor with a ferromagnetic substrate

Measurement of magnetic properties of Ni-alloy substrate of HTS coated conductor in LN2

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