K. Itoh

Combination of X-ray transmission and eddy-current testing for the closed-loop recycling of aluminum alloys

Takasi Takezawa, Michihisa Uemoto, K. Itoh

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Relation of n-value to critical current in bent-damaged Bi2223 composite tape

Shojiro Ochiai, Hiroshi Okuda, M. Sugano, Masaki Hojo et autres

The relation of n -value to critical current of bent-damaged (Bi,Pb)2Sr2Ca2Cu3O10+δ (Bi2223) composite tape was studied experimentally and analytically. The experimental results showed that, under bending strain, the n -value decreased rather slightly with decreasing critical current in comparison with the data …

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Effect for Inhomogeneity by Pb Substitution on (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δSingle Crystals

Shingo Komaki, Y. Kourogi, Taiki Murano, Akiko FURUSHIMA et autres

Inhomogeneity is one of the most important problems for the investigation of the superconductor-insulator transition. Y and Pb co-doped Bi2Sr2CaCu2O8+δ(PbY-Bi2212) crystals were fabricated by the self-flax method in order to control both carrier density and dimensionality. The Y-content of PbY-Bi2212 crystals was …

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Analysis of distribution of critical current of bent-damaged Bi2223 composite tape

Shojiro Ochiai, Hiroshi Okuda, M. Sugano, Masaki HOJO et autres

Distributions of critical current of damaged Bi2223 tape specimens bent by 0.6, 0.8 and 1.0% were investigated analytically with a modelling approach based on the correlation of damage evolution to distribution of critical current. It was revealed that the distribution of critical …

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Theoretical Studies of Equilibrium Beta Limit in Heliotron Plasmas

N. Kasuya, Machiko Saeki Yagi, K. Itoh, S.‐I. Itoh

Modeling analysis of irreversible bending strain distribution and critical current distribution at low bending strains of Bi2223-composite tape

Shojiro Ochiai, Hiroshi Okuda, M. Sugano, Masaki Hojo et autres

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Analysis of critical current distribution of bent Bi2223 composite tapes by unifying parameter approach and its application to the description of average critical current–bending strain relation near the average irreversible strain

Shojiro Ochiai, Hiroshi Okuda, M. Sugano, Masaki HOJO et autres

When the critical current of bent Bi2223 composite tape is measured for many specimens, the critical current value is different from specimen to specimen, being distributed from low to high values. We need to characterize the distribution of critical current at various …

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Relation between inhomogeneous structure and transport properties for superconductor-insulator transitions

Shingo Komaki, Yoko Sawada, Bunshiro Saya, Fusao Ichikawa et autres

In the study of superconductor-insulator transitions of high- T c cuprates complicated behaviors in transport properties were observed for example quasi-reentrant behaviors. In this study we report that the relation between microscopic structure and transport properties for Bi 2 Sr 2 CaCu …

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Oscillatory Zonal Flows Driven by Interaction between Energetic Ions and Fishbone-like Instability in CHS

A. Fujisawa, S. Ohshima, Hiroyuki Nakano, Hiroko Iguchi et autres

Nonlinear evolution of magneto-hydro-dynamic (MHD) oscillatory phenomenon driven by the interaction with energetic particles has been studied in CHS using twin heavy ion beam probes. The measurements have provided the fine observation of internal structure of plasma quantities, such as electric field, …

Development of Net-Current Free Heliotron Plasmas in the Large Helical Device

A. Komori, H. Yamada, O. Kaneko, K. Kawahata et autres

Author: Komori, A. et al.; Genre: Journal Article; Issued: 2009; Open Access; Keywords: 22nd IAEA Fusion Energy Conference, Geneva, 2008-10-13 to 2008-10-18; Title: Development of net-current free heliotron plasmas in the Large Helical Device

Strain characteristics of critical current in RABiTS/Y-Ba-Cu-O coated conductors

Kazuaki KATAGIRI, Y. Tsunematsu, Y. Ishikawa, Tomoko Takahashi et autres

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Hoop Stress Tests of Bi-2223 Coils

Shinji Matsumoto, Seyong Choi, Akihiro Otsuka, K. Itoh et autres

High-temperature superconductors (HTS) are considered to be indispensable to realize NMR magnets that exceed 1 GHz owing to their high critical current densities even in high magnetic fields exceeding 20 T. Feasibility studies of the 1-GHz NMR magnet with the HTS inner …

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