H. Suzuki

Yokohama National University, Yokohama, Kanagawa, Japan

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Publications (6)9.83 Total impact

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    ABSTRACT: We investigated uni-axial tensile stress dependence of AC losses (transport current, magnetization and total losses) in HTS coated conductor with magnetic Ni-alloy substrate. The AC loss characteristics are studied by relating to tensile stress dependence of critical currents of the conductor. Experimental results showed that the loss characteristics were different whether the critical current recovered the original value after the release of the stress or not. Dependence of AC loss characteristics on magnetic property of the substrate is also studied.
    IEEE Transactions on Applied Superconductivity 07/2007; · 1.20 Impact Factor
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    ABSTRACT: Stress dependencies of AC transport current losses, magnetization losses and total losses were investigated applying tensile stresses to an YBCO (IBAD/PLD) conductor. Measured transport current losses showed slight stress dependence in the range of 0~1 GPa. That can be explained by stress dependence of the critical current of the conductor. The magnetization and total losses are less sensitive to the stress than the transport current losses
    IEEE Transactions on Applied Superconductivity 07/2006; · 1.20 Impact Factor
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    ABSTRACT: Recent advances in the manufacturing of multifilamentary high temperature superconducting composite wires allow for wider practical applications of the conductors, e.g. in power transmission cables, transformers and motors. The wires, based mainly on BSCCO-2223 and YBCO-123 cuprates, are used in the forms of variously shaped coils; therefore they are subjected to different kinds of mechanical stresses and strains. These, in turn, lead to some changes in the physical parameters of the superconducting material, mainly in the critical current density, and thus in the dissipated electromagnetic energy, when subjected to changing magnetic fields and transport currents. In this work we report some experimental results related to the AC loss characteristics of Bi-2223/Ag multifilamentary tapes and their dependences on bending strains. These losses are compared to the losses of virgin, straight tapes. The total AC losses, i.e. transport current and magnetization losses, in the Bi-2223/Ag tapes, were measured by means of the electrical and calorimetric methods. The experimental data obtained are compared with the critical state model predictions for AC loss behaviour in the experimental conditions presented here.
    Superconductor Science and Technology 06/2006; 19(8):792. · 2.76 Impact Factor
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    ABSTRACT: The axial tensile stress dependences of AC transport current losses and magnetization losses in YBCO conductors, made by the IBAD/PLD (ion beam assisted deposition/pulse laser deposition) process, were investigated in the stress range 0–770 MPa. Measured transport current losses showed a slight stress dependence, which can be explained by the stress dependence of the critical current of the conductor Ic. The magnetization losses were less sensitive to the stress than the transport current losses. The tensile stress dependences of those losses can be estimated from the data for those losses at zero stress and stress dependent Ic.
    Superconductor Science and Technology 03/2006; 19(6):445. · 2.76 Impact Factor
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    ABSTRACT: In the work we present experimental results of AC magnetization losses reduction due to striation process in YBCO-123/Hastelloy coated conductors. The measurements were carried out in a sinusoidally varying external magnetic field, with amplitudes up to 100 mT, in a frequency range of 8.5-85.4 Hz, and at temperature of 77 K. The field was oriented perpendicularly to the face of the tapes. Sample tapes were successively patterned into a form of narrow, parallel strips, by means of a photoresist lithography and chemical wet etching technique. Experimental results are discussed in a framework of existing theoretical models for energy dissipation in thin films in perpendicular AC magnetic fields.
    IEEE Transactions on Applied Superconductivity 07/2005; · 1.20 Impact Factor
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    ABSTRACT: Electrical power devices, e.g. motors, power transmission cables, transformers, etc. are the most promising, and nowadays the most technologically advanced, applications of high temperature superconductors (HTS). Multifilamentary HTS tapes (usually Bi-2223/Ag composites) are used in forms of various in shape coils, therefore are subjected to different kinds of mechanical stresses. This leads to some changes in physical parameters of superconducting material, mainly in the critical current density, and thus in the dissipated electromagnetic energy. In general, when a superconductor is carrying an AC transport current and simultaneously subjected to an external AC magnetic field, the total dissipated energy can be considered as a sum of components, the transport loss and the magnetization loss. In this work we report some experimental results related to the total AC loss characteristics of Bi-2223 tapes and their dependencies on bending strains. An external magnetic field, in phase with an AC transport current, was directed parallel to the wider surfaces of the samples. The total AC losses in the Bi-2223/Ag tapes were measured by means of a calorimetric method. Obtained experimental data are compared with the critical state model predictions for total losses behavior in presented here experimental conditions.
    Physica C Superconductivity 01/2005; 426:1333-1338. · 0.72 Impact Factor