Kazutaka Imamura

Machine Learning-Based Detection and Analysis of Current Blocking Local Obstacles in REBCO Coated Conductors Obtained from Different Manufacturing Processes

Zeyu Wu, Kohei Higashikawa, Kazutaka Imamura, Takanobu Kiss

In this study, we successfully developed a method to analyze spatial inhomogeneity in long-length REBCO coated conductors (CCs) manufactured by different processes, by combining reel-to-reel scanning Hall-probe microscopy (RTR-SHPM) with a machine learning-based object detection algorithm. Spatial homogeneity of REBCO CCs is …

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Scaling Behavior of Induced Electric Field in Cuprate Superconducting Tapes During Magnetization Relaxation

Zeyu Wu, Kohei Higashikawa, Kazutaka Imamura, Takanobu KISS

We have investigated a scaling behavior of induced electric field during magnetization relaxation in cuprate superconducting tapes based on scanning Hall probe microscopy (SHPM). Magnetization measurement is a standard method to evaluate critical current density (Jc) properties in a superconducting sample, if …

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Characterization of Spatial Distribution of Local Critical Current Density in a Co-Doped BaFe2As2 Film Based on Magnetic Microscopy

Zeyu Wu, Kohei Higashikawa, Kazutaka Imamura, Zhongtang Xu et autres

We have investigated spatial distribution of local critical current density (Jc) in a Co-doped BaFe2As2(Ba122:Co) film based on scanning Hall-probe microscopy (SHPM). In-plane Jcdistribution was derived from the magnetic field distribution. Thanks to the high-resolution characterization, local obstacle can be detected clearly, …

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Diagnostic Method for Monitoring Core Position and Strand Failure in DC Superconducting Cable

Kohei Higashikawa, Tatsuhiro Kaneshige, Kohei Tokuyama, Kazutaka Imamura et autres

We have developed a diagnostic method for monitoring core position and strand failure in DC superconducting cable. DC superconducting cable has been expected for various uses such as HVDC, railway feeding, etc. On the other hand, diagnostics is indispensable for its practical …

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Enhancement of In-Field Critical Current Density of BaZrO3-Added (Y, Gd) BCO-Coated Conductors by Using a Multi-Coating TFA-MOD Method

T. Suzuki, Syunsuke Oomura, Kazutaka Imamura, Masayoshi Inoue et autres

We have investigated the in-field critical current properties in BaZrO3-added (Y, Gd) Ba2Cu3O7-δ(YGdBCO)-coated conductor fabricated by using a multi-coating trifluoroacetates metal-organic deposition (MOD) method. We compared these properties with EuBCO-coated conductor fabricated by the pulsed laser deposition (PLD) method. The sample using …

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Current transport properties of BaZrO 3 introduced YGdBCO coated conductors by TFA-MOD process adopting multiple-coating with reduced once-coat-layer-thickness

Shunsuke Oomura, T. Suzuki, Kazutaka Imamura, Masayoshi Inoue et autres

BaHfO_3添加EuBa_2Cu_3O_<7-δ>,高温超伝導線材の磁場中臨界電流特性

Masayoshi Inoue, Y. Onodera, Kazutaka Imamura, Takumi Suzuki et autres

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Correlation between In-filed J c at 77K and Those at Low Temperature

Masayoshi Inoue, T. Suzuki, Kazutaka Imamura, Kohei Higashikawa et autres

Enhancement of in-field critical current density of BaZrO3 introduced (Y, Gd)BCO coated conductors by TFA-MOD process adopting multiple-coating with reduced once-coat-layer-thickness

Takumi Suzuki, Syunsuke Oomura, Kazutaka Imamura, Masayoshi Inoue et autres

BaHfO3添加EuBa2Cu3O7-δ,高温超伝導線材の磁場中臨界電流特性

Masayoshi Inoue, Yuta Onodera, Kazutaka Imamura, T. Suzuki et autres

Comparison between Bi-2223 tape and RE-123 coated conductor from the view point of current transport properties influencing thermal stability

Takanobu KISS, Masayoshi Inoue, Kohei Higashikawa, T. Suzuki et autres

We have investigated flux flow dissipation in typical two kinds of HTS tapes, i.e., a Bi-2223 multi-filamentary tape and a RE-123 coated conductor (CC) from the view point of heat load under over current conditions. Based on systematic measurements on current-voltage characteristics, …

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Characterization of Longitudinal Distribution of Local Critical Current in In-field Condition for Long REBCO Coated Conductor with Artificial Pinning Center

Takahiro Fukuzaki, Kohei Higashikawa, Kazutaka Imamura, Masayoshi Inoue et autres