研究者詳細 - 木内　勝

論文 - 木内　勝

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Critical current density properties of thick YBa2Cu3Oy films with different thicknesses 査読有り国際誌

Ito S., Kiuchi M., Horide T., Yoshida Y.

Physica C Superconductivity and Its Applications 634 2025年07月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Even in REBa<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf> (REBCO) films, which exhibit high critical current density (J<inf>c</inf>) under low-temperature and high-magnetic-field conditions, their performance deteriorates significantly at high-temperatures because of pronounced flux creep induced by thermal agitation. This degradation is particularly pronounced in thin superconducting films, as the thickness constrains the pinning correlation length. In this study, we examined the effect of YBCO film thickness on J<inf>c</inf> within the range of 0.94 to 3.7 μm. While some variations were observed depending on crystal orientation, thicker superconducting layers demonstrated a smaller reduction in J<inf>c</inf> with increasing magnetic field in high-temperature regions, resulting in superior J<inf>c</inf> values under high-temperature and high-magnetic-field conditions. Moreover, the apparent pinning potential U<inf>0</inf>*, determined from magnetization relaxation measurements, was larger for thicker films in these conditions, indicating that U<inf>0</inf>* is influenced by the thickness of the superconducting layer. These findings are further supported by the flux creep flow model analysis. Collectively, these results suggest that not only introducing strong pinning forces but also increasing the thickness of the superconducting layer is an effective strategy for enhancing performance near liquid nitrogen temperatures.

DOI： 10.1016/j.physc.2025.1354734

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Measurement of critical current of superconducting cable 査読有り

Matsushita T., Kiuchi M., Nishijima G., Masuda T., Mukoyama S., Aoki Y.

Japanese Journal of Applied Physics 60 ( 12 ) 2021年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The critical current of a coaxial cable made of Bi-2223 tapes was investigated to survey underlying problems, especially for the resistive voltage caused by current transfer, for the standardization of test method of the critical current of superconducting AC power cables. Five voltage taps were attached on the copper sheath of 80 mm long, which is used as a part of the current lead, on both ends for the inner conductor layer and outer shield layer. The current transfer was theoretically examined especially for the outer shield layer of a simple structure. The resistive component in the measured voltage was calculated as a function of the position of the voltage tap, and it can be shown that the critical current is correctly obtained using the electric field criterion after subtracting the resistive component, as is usually done in experiments. These results are compared with the observed results.

DOI： 10.35848/1347-4065/ac32f7

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Test Station for High Temperature Superconducting Power Cables 査読有り国際誌

Quéval L., Huchet D., Trillaud F., Kiuchi M., Matsushita T.

IEEE Transactions on Applied Superconductivity 34 ( 3 ) 1 - 4 2024年05月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The Gargantua test station is capable of delivering a direct current of 4800 A at a voltage of 10 V. It is designed for acquiring the dc voltage-current characteristic of high-temperature superconducting power cables operating at 77.3 K in liquid nitrogen. The goal is to estimate their critical current. The standardization of this dc characterization is a prerequisite for the adoption of this promising technology by power grid operators. This document reports on the experimental setup and the subsequent measurements carried out on a high-temperature superconducting power cable manufactured by Sumitomo and tested as part of the international round robin test for the IEC Technical Committee 90 Superconductivity.

DOI： 10.1109/TASC.2024.3360931

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International Round Robin Test of Critical Current of Superconducting Cable Sample 査読有り国際誌

Matsushita T., Kiuchi M., Masuda T., Mukoyama S., Funaki K., Cho J., Lu J., Raine M.J., Queval L., Trillaud F., Zhang G., Song M., Zheng J., Chen Z., Li J.

IEEE Transactions on Applied Superconductivity 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Ten institutes from six countries participated in an international round-robin test to evaluate the critical current of a superconducting power cable made of Bi-2223 tapes. The cable design featured a two-layer inner core conductor and a single-layer outer shield conductor. The shield layer measured approximately 40 mm in diameter, and the cable length was 2.0 meters. To eliminate the influence of resistive voltage drops from current transfer, voltage taps for measurement were positioned at a sufficient distance from the current terminals. The critical current was determined using the resistive method with the electric field criterion of 1.0 μV/cm. Additionally, the <italic>n</italic> -value, an optional parameter reflecting the current-voltage (<italic>I</italic>-<italic>V</italic>) characteristics, was extracted from the <italic>I</italic>-<italic>V</italic> curve within an electric field range of 0.1 to 1.0 μV/cm. A detailed uncertainty analysis was conducted for both the critical current and the <italic>n</italic> -value. Finally, the paper discusses the potential for standardization of the employed resistive measurement method.

DOI： 10.1109/TASC.2024.3438251

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HTS Cable International Round Robin: 4.4 kA Critical Current Measurements 査読有り国際誌

Hutson R.G., Raine M.J., Kiuchi M., Matsushita T., Hampshire D.P.

IEEE Transactions on Applied Superconductivity 33 ( 5 ) 2023年08月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The critical current of the core and shield of a 2.1 m long, 40 mm diameter Bi-2223 HTS coaxial cable was measured as part of an International Round Robin organised by Japan involving several international laboratories. In Durham, we found using a 100 μVm-1 criterion and an 8 minute trace time that Ic of the core and shield were 4386 A and 4143 A and the n-values were 19.6 and 14.4 respectively. 8 minute trace times were found to be a practical approximation of steady state conditions, with critical current values 0.5% and 1.2% larger than values obtained using 2 minute trace times, and n-values not significantly different to 2 minute trace values. Two minute trace time data were compared with equivalent data from other participating labs and excellent agreement was found: Ic was 0.6% and 1.5% larger for the core and shield respectively. The E-field range has a significant effect on the n-value measurements, which varied between groups. Good agreement between the participants for the shield was found for electric fields below 100 μVm-1, although larger n-values were found at higher electric fields at Durham and some other laboratories. The polarity of the current and the proximity of the return power cable were demonstrated to have negligible effect (< 0.1%) on the Ic measurements. Removing conductive and ferromagnetic materials that were part of Durham's experimental set-up increased Ic by < 1%. An intrinsic trace time dependency was found for Ic for trace times of less than 8 minutes that we attribute to the time required for fluxons to equilibrate with the underlying pinning landscape in a changing net magnetic field.

DOI： 10.1109/TASC.2023.3263143

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Magnetic Relaxation in Commercial REBCO Tapes With and Without Artificial Pinning Centers 査読有り国際誌

Tsuchiya Y., Funaki S., Ozaki T., Kiuchi M., Yoshida Y.

IEEE Transactions on Applied Superconductivity 32 ( 6 ) 2022年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

High-temperature superconducting REBCO tapes are expected to be applied to next-generation magnets for their high current density. One of their problems in the magnet application is the magnetic field instability caused by the decay of magnetization due to the shielding current caused by the tape shape. Therefore, it is important to evaluate the magnetization relaxation of REBCO tapes for the magnet design. In this study, we evaluated the magnetization relaxation of commercial REBCO tapes with and without APCs from Fujikura, SuperPower, and SuperOx in a wide temperature and field range. As a result, at low temperatures below 20K, there was negligible change, but at medium and above temperatures, the change due to the introduction of APC was different for each providers. By discussing the temperature dependence based on the flux creep model and the double kink excitation model, we explained why magnetization relaxation occurs, which is necessary for magnet design.

DOI： 10.1109/TASC.2022.3171190

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Round Robin Test of Critical Current of Superconducting Cable 査読有り

Matsushita T., Kiuchi M., Nishijima G., Masuda T., Mukoyama S., Aoki Y., Nakai A.

IEEE Transactions on Applied Superconductivity 31 ( 5 ) 2021年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

The Japanese national project started on standardization of the test method of the DC critical current of superconducting cables. A round robin test of critical current measurement is carried out to survey underlying problems for the standardization. The sample cables are made of Bi-2223 tapes and the inner core conductor has two layers and the outer shield conductor is composed of a single layer. The diameter of the shield layer is about 40 mm and the length of the cable is 2.00 m. The critical current was determined by the electric field criterion of 1 μV/cm. The n value is also measured for the inner core and the outer shield conductor. Three institutes participated in the test for two sample cables. The obtained experimental relative standard deviation for the critical current at 77.30 K is in the range of 0.2 to 1.3%, and is sufficiently small. Hence, it can be said that the present method that is widely used is suitable as a standard test method. On the other hand, the experimental relative standard deviation of the value is in the range of 2.8 to 18.6%, which is relatively large. This is caused by the measurements done at different temperatures.

DOI： 10.1109/TASC.2021.3058232

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Design and evaluation of 10-kA class superconducting DC power cable based on longitudinal magnetic field effect 査読有り

Kinoshita Y., Yonenaka T., Ichiki Y., Akasaka T., Otabe E.S., Kiuchi M., Matsushita T., Hu N., Ni B., Ma T.

Journal of Physics: Conference Series 1975 ( 1 ) 2021年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In this study, we designed a power cable based on the longitudinal magnetic field (LMF) effect using an iterative approximation method. An evaluation of the cable shows that it is more efficient than conventional-design power cables. A cable with four inner layers and four shield layers and a maximum winding angle of 30 had a current capacity of more than 10 kA. Based on calculation results, we fabricated a 2-m-long LMF power cable and a conventional-design power cable. Experimental results show that the proposed power cable can carry more current (8.8% more current per tape and 18% more current overall) than a conventional-design power cable due to the LMF effect. These results well agree with the theoretical calculation results.

DOI： 10.1088/1742-6596/1975/1/012037

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縦磁界効果を用いた10kA級超伝導直流ケーブルの設計

米中友浩, 小田部荘司, 一木悠人, 松下照男, 木内勝

応用物理学会学術講演会講演予稿集 ( 公益社団法人応用物理学会 ) 2020.1 ( 0 ) 2065 - 2065 2020年02月

Enhanced critical current density in BaFe<inf>2</inf>(As<inf>0.66</inf>P<inf>0.33</inf>)<inf>2</inf> nanocomposite superconducting films 査読有り

Miura M., Tsuchiya G., Harada T., Tanabe K., Kiuchi M., Matsushita T.

Superconductor Science and Technology 32 ( 6 ) 2019年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 IOP Publishing Ltd. The high upper critical field and low anisotropy of the 122-type iron-based superconductor BaFe2As2 makes it promising for use in superconducting high field magnets. However, its critical current density (J c) in high magnetic fields needs to be further improved. Here we show that for the film prepared by pulsed laser deposition method by controlling the deposition parameters (higher substrate temperature and lower growth rate), the crystallinity of BaFe2(As0.66P0.33)2 (Ba122:P) matrix is improved while maintaining a high density of incoherent BaZrO3 (BZO) nanoparticles (NPs) which together lead to significantly increased self field J c. Our Ba122:P nanocomposite films also exhibit increased in-field J c, reduced angular anisotropy of J c and reduced detrimental effects of thermal fluctuations (creep rate) over a wide range of temperatures and magnetic field strength. The BZO NP doped Ba122:P films show high in-field J c over 2.1 MA cm-2 even at 4 K and 9 T (μ 0 H||c), which is significantly higher than that of standard Ba122:P films and conventional alloy superconducting wires. To understand the contribution of the various pinning centers, we applied a simple model, which was developed for cuprates, to Ba122:P film with all the parameters used derived by fitting to a limited set of experimental data (no free parameters) such that temperature, angle and field properties at other experimental conditions are then calculated. This simple model fits very well to the experimental results in these two very different material systems. We discuss the effectiveness of natural defect and BZO NPs on the ratio of J c to the depairing current density. The superconducting properties for 122-type iron-based superconductors obtained through this work are considered promising for high-field applications.

DOI： 10.1088/1361-6668/ab0faf

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Theoretical estimation of the upper limit of critical current density by flux pinning in superconductors under the influence of kinetic energy 査読有り

Matsushita T., Kiuchi M.

Applied Physics Express 12 ( 2 ) 2019年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 The Japan Society of Applied Physics. The upper limit of critical current density by the flux pinning mechanism is theoretically investigated by taking into account the influence of kinetic energy. The upper limit is estimated to be 67% of the depairing current density in the London limit, which is about 23% higher than the estimation by Tinkham. The reason for the higher value is attributed to the enhancement of the order parameter that reduces the kinetic energy caused by the current. The possibility of such a strong flux pinning is discussed for nano-rods introduced to REBCO coated conductors.

DOI： 10.7567/1882-0786/aaf787

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CiNii Article

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Depairing current density in superconductors 査読有り

Matsushita T., Kiuchi M.

Applied Physics Express 12 ( 6 ) 2019年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 The Japan Society of Applied Physics. The depairing current density in superconductors is theoretically investigated for magnetization and transport currents. It is found that the depairing current densities in both cases are higher than those predicted by Tinkham. One of the reasons for the higher current densities is that those are obtained at the transition point to the normal state, while Tinkham obtained in the superconducting state far from the transition boundary. Another reason is that the order parameter is larger than the equilibrium value, which contributes not only directly to a higher current density but also to a lower kinetic energy due to the current.

DOI： 10.7567/1882-0786/ab1f94

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Consideration on appearance and disappearance of energy in superconductors during change in external magnetic field 査読有り

Matsushita Teruo, Kiuchi Masaru

Jpn. J. Appl. Phys. 57 ( 10 ) 2018年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

When flux lines are displaced in a superconductor upon an increase in external magnetic field, the energy penetrating the superconductor is larger than the increase in magnetic energy. In some cases, the energy coming out of a superconductor is larger than the decrease in magnetic energy when the magnetic field is decreased, indicating the appearance of energy. These differences between the penetrating energy and the change in magnetic energy can be explained as a work done by the driving force against the pinning force that determines the magnetic flux distribution in the superconductor. The disappeared energy is dissipated or absorbed as an increase in the pinning energy. This indicates that the Maxwell theory is comprehensive also for electromagnetic phenomena in superconductors. The displacement of flux lines is also examined for the force-free state established in a current-carrying superconductor in a parallel magnetic field. A similar difference in energy suggests the existence of a generalized driving force, i.e., a driving torque, since the Lorentz force is zero in this state. This clearly shows that the flux cutting event cannot be realized, since it is based on the magnetic interaction and the penetrating energy cannot be absorbed.

DOI： 10.7567/JJAP.57.103101

CiNii Article

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高密度BaZrO3ナノ粒子がTFA-MOD (Y0.77Gd0.23)Ba2Cu3Oy線材の縦磁場中超伝導特性に及ぼす影響

平井康太, 草間祐, 佐藤廸夫, 三浦正志, 木内勝

応用物理学会学術講演会講演予稿集 ( 公益社団法人応用物理学会 ) 2018.1 ( 0 ) 2365 - 2365 2018年03月

Design of flux pinning property in REBCO coated conductors with artificial pinning centers 査読有り

Matsushita T., Kiuchi M.

Progress in Superconductivity and Cryogenics (PSAC) 20 ( 1 ) 1 - 10 2018年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018, Korea Institute of Applied Superconductivity and Cryogenics. All rights reserved. The improvement of critical current properties of REBa2Cu3O7-x (REBCO) coated conductors by introducing artificial pinning centers (APCs) is examined with respect to the field-angle anisotropy, high-field performance and relaxation property with time. Nano-rods along the -axis introduced by PLD method and isotropic nano-particles introduced by TFA-MOD method are treated. The theoretical analysis is also shown to understand the effect of APCs quantitatively. The effects of superconducting layer thickness that influences the high-field performance and relaxation property are also discussed. It is shown that the upper critical field, which is another important factor to determine the high-field property, can be improved by introduction of APCs through electron scattering at interfaces with the superconducting matrix. The optimum critical current property can be obtained by properly designing the morphology and number density of APCs and the superconducting layer thickness.

DOI： 10.9714/psac.2018.20.1.001

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Tuning nanoparticle size for enhanced functionality in perovskite thin films deposited by metal organic deposition 査読有り

Miura M., Maiorov B., Sato M., Kanai M., Kato T., Kato T., Izumi T., Awaji S., Mele P., Kiuchi M., Matsushita T.

NPG Asia Materials 9 ( 11 ) 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Because of pressing global environmental challenges, focus has been placed on materials for efficient energy use, and this has triggered the search for nanostructural modification methods to improve performance. Achieving a high density of tunable-sized second-phase nanoparticles while ensuring the matrix remains intact is a long-sought goal. In this paper, we present an effective, scalable method to achieve this goal using metal organic deposition in a perovskite system REBa 2 Cu 3 O 7 (rare earth (RE)) that enhances the superconducting properties to surpass that of previous achievements. We present two industrially compatible routes to tune the nanoparticle size by controlling diffusion during the nanoparticle formation stage by selecting the second-phase material and modulating the precursor composition spatially. Combining these routes leads to an extremely high density (8 × 10 22 m â '3) of small nanoparticles (7 nm) that increase critical currents and reduce detrimental effects of thermal fluctuations at all magnetic field strengths and temperatures. This method can be directly applied to other perovskite materials where nanoparticle addition is beneficial.

DOI： 10.1038/am.2017.197

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Development of innovative superconducting DC power cable

Matsushita T., Kiuchi M.

Progress in Superconductivity and Cryogenics (PSAC) 19 ( 3 ) 1 - 7 2017年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017, Korea Institute of Applied Superconductivity and Cryogenics. All rights reserved. It is required to reduce the cost of superconducting cable to realize a superconducting DC power network that covers a wide area in order to utilize renewable energy. In this paper a new concept of innovative cable is introduced that can enhance the current-carrying capacity even though the same superconducting tape is used. Such a cable can be realized by designing an optimal winding structure in such a way that the angle between the tape and magnetic field becomes small. This idea was confirmed by preliminary experiments for a single layer model cable made of Bi-2223 tapes and REBCO coated conductors. Experiments of three and four layer cables of practical sizes were also done and it was found that the current-carrying capacity increased as theoretically predicted. If the critical current properties of commercial superconducting tapes are further improved in a parallel magnetic field, the enhancement will become pronounced and this technology will surely contribute to realization of superconducting DC power network.

DOI： 10.9714/psac.2017.19.3.001

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Evaluation of Magnetic Cutting and Polishing with Superconducting Bulks 査読有り

Hiramatsu Y., Takahashi Y., Otabe E., Suzuki K., Tanaka Y., Kiuchi M.

Journal of Physics: Conference Series 871 ( 1 ) 2017年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Published under licence by IOP Publishing Ltd. In this paper, magnetic levitation tool with superconducting bulks is introduced as a new hollow machining technology. Magnetic levitation tool is the machine that magnet levitates above superconducting bulks and driving force of rotating magnet shaves the object. This tool is expected to use for a grinding machine and machining device because of hollow machining and micromachining by strong fixing. For using magnetic levitation tool, the attractive force, the repulsive force and rotating torque are important for grinding machine, machining outer surface and both, respectively. These forces are calculated by FEM, and compared with experimental results. The experimental results are agreed well with calculated results. However, the attractive force is one order smaller than that required in chemical mechanical polishing.

DOI： 10.1088/1742-6596/871/1/012048

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Evaluation of Trapped Magnetic Field Properties in Superconducting MgB<inf>2</inf> Bulk Magnets of Various Shapes by Finite Element Method 査読有り

Hiramatsu Y., Otabe E., Kiuchi M.

Physics Procedia 81 69 - 72 2016年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 The Authors.The trapped magnetic field properties of superconducting MgB2 bulk magnets with various shapes such as a triangular, a quadrangular, a hexangular bulk were calculated by the Finite Elements Method (FEM). The effect for the combination of several numbers of bulks was also investigated for several kinds of shapes to obtain large area of bulk surface in spite of one large bulk. In this calculation, the simple magnetization process replaced by the field-cool magnetization was used to obtain the equivalent distribution of the magnetic field, and the thermal equation in FEM was omitted. The trapped magnetic field for the triangular bulk by FEM was compared with the experimental result. It was found that the calculated results agreed well with the experimental result. The maximum trapped magnetic field was obtained in the cylindrical shape among several kinds of shapes. The trapped magnetic field was increased by the combination of multi-bulks. It was confirmed that the trapped magnetic field of the multi-bulks was larger than that of the single bulk. The trapped magnetic field increases with increasing the number of the bulks.

DOI： 10.1016/j.phpro.2016.04.027

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Critical Current Properties in Longitudinal Magnetic Field of YBCO Superconductor with APC 査読有り

Kido R., Kiuchi M., Otabe E., Matsushita T., Jha A., Matsumoto K.

Physics Procedia 81 117 - 120 2016年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The critical current density (Jc) properties of the Artificial Pinning Center (APC) introduced YBa2Cu3O7 (YBCO) films in the longitudinal magnetic field were measured. Y2O3 or Y2BaCuO5 (Y211) was introduced as APCs to YBCO, and YBCO films with APC were fabricated on SrTiO3 single crystal substrate. The sizes of Y2O3 and Y211 were 5 - 10 nm and 10 - 20 nm, respectively. As a result, Jc enhancement in the longitudinal magnetic field was observed in Y2O3 introduced YBCO films. However, it was not observed in Y211 introduced YBCO films. Therefore, it was considered that Jc properties in the longitudinal magnetic field were affected by introducing of small size APC, and it was necessary that APC does not disturb the current pathway in the superconductor.

DOI： 10.1016/j.phpro.2016.04.012

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Enhanced current-carrying capacity of three-layer cable composed of Bi-2223 tapes using the longitudinal field effect 査読有り

Vyatkin V., Vyatkin V., Kiuchi M., Kiuchi M., Otabe E., Otabe E., Ohya M., Matsushita T., Matsushita T.

IEEE Transactions on Applied Superconductivity 25 ( 3 ) 2015年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2014 IEEE.Innovative dc superconducting cables with higher current-carrying capacity than conventional cables were proposed in previous works. The superior property is brought about by the longitudinal magnetic field that enhances the critical current density. In this work, the current-carrying capacity of a three-layer cable composed of Bi-2223 tapes was theoretically calculated based on the measured critical current density in the longitudinal magnetic field. The obtained current-carrying capacity of the proposed cable is 13.2% higher in comparison with the conventional cable of the same size.

DOI： 10.1109/TASC.2014.2364607

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Current-carrying capacity of HTS DC cables with the reduced Lorentz force 査読有り

Vyatkin V., Tanabe K., Otabe E., Kiuchi M., Matsushita T.

Journal of Physics: Conference Series 507 ( PART 2 ) 2014年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The structure of superconducting DC cable made with high temperature superconducting tapes is designed to improve the current-carrying capacity by reducing the Lorentz force acting on flux lines. For this purpose an axial magnetic field is produced by the outer shield conductor. The analysis was performed for the optimum structure for various superconducting tapes with different Jc(B,θ) characteristics. It is found that the current-carrying capacity increases appreciably when the difference in the critical current density of the tape is large enough between normal and parallel magnetic fields.

DOI： 10.1088/1742-6596/507/2/022045

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Fabrication of 1 T Bi-2223 superconducting magnet with 92 mm bore diameter at 77 K 査読有り

Otabe E., Vyatkin V., Kiuchi M., Matsushita T., Ni B., Kato T., Nishimura T., Uetsuki R.

AIP Conference Proceedings 1573 754 - 759 2014年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2014 AIP Publishing LLC. A Bi-2223 superconducting magnet for practical use in liquid nitrogen is designed and fabricated. Bi-2223 tapes prepared by ConTrolled Over Pressure (CT-OP) process are used for the winding, and the critical current at 77.3 K and selffield is in the range of 174-185 A. 28 double-pancake coils are resistively connected in series by copper terminals. High critical current tape is used for top and bottom double-pancake coils, since the magnetic field normal to the tape surface is highest at the top and bottom of the magnet. Two iron plates at top and bottom of the magnet are used for reduction of the normal component of magnetic field to the Bi-2223 tape, since the total performance of the magnet is determined by the minimum critical current at maximum normal magnetic field component to the tape. The inner bore diameter of the magnet is 92 mm. And the homogeneity of magnetic field of long-axis direction in 50 mmø× 100 mm length is within 3%. The maximum magnetic field at the center of the bore is over 1.0 T at 77.3 K.

DOI： 10.1063/1.4860779

Scopus

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人工ピンニングによるREBCO 薄膜の臨界電流特性改善査読有り

松下照男, 木内勝

低温工学 ( 公益社団法人低温工学・超電導学会 (旧社団法人低温工学協会) ) 49 ( 3 ) 91 - 98 2014年01月

記述言語：日本語掲載種別：研究論文（学術雑誌）

Nanorods and nanoparticles are commonly introduced to REBCO coated conductors as artificial pinning centers to improve the critical current density in high magnetic fields and to reduce the anisotropy with respect to the magnetic field angle. In this article the pinning properties are theoretically analyzed based on the classic condensation energy pinning interaction mechanism (δTc pinning) of these pinning centers and the results are compared with experimental results. The agreements show that the critical current density can be designed by controlling the microstructure of pinning centers and factors such as the size, number density and morphology. It is also pointed out that the upper critical field is enhanced via the electron scattering of the interface between the pinning center and the superconducting matrix. Hence, the upper critical field can also be controlled to enhance the irreversibility field by controlling the interface area in a unit volume of the superconductor. It is expected that the high field performance can be optimized by controlling the pinning strength and the upper critical field in the future.

DOI： 10.2221/jcsj.49.91

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130004457544

高性能超電導直流ケーブルの設計査読有り

松下照男, S. VYATKIN Vladimir, 木内勝, 小田部荘司

低温工学 = Cryogenic engineering ( 公益社団法人低温工学・超電導学会 (旧社団法人低温工学協会) ) 48 ( 11 ) 569 - 576 2013年11月

Effect of packing density on critical current density at high magnetic fields in polycrystalline MgB2 superconductors 査読有り

Matsushita T., Tanigawa J., Kiuchi M., Yamamoto A., Yamamoto A., Shimoyama J., Kishio K.

Japanese Journal of Applied Physics 51 ( 12 ) 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

It is well understood that the critical current density in polycrystalline MgB2 superconductors is severely restricted by porosities and wet insulating layers that cover superconducting grains. The relationship between critical current density and electrical connectivity is well explained by the prediction of the percolation theory. Recently, it has been found that the irreversibility field that directly influences the high-field performance of the critical current density is also dependent on electrical connectivity. This behavior is explained by the finding that superconducting grains with the c-axis tilted by a small angle from the direction of applied magnetic field lose their superconductivity at relatively low magnetic fields owing to the low irreversibility field, resulting in a decrease in the effective packing density. This phenomenon is theoretically investigated using the percolation theory and the theory of flux creep and flow. The obtained result explains the experimental result well. This shows that the packing factor of MgB2 is also important for improving the critical current density at high magnetic fields. © 2012 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.51.123103

Scopus

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Innovative superconducting force-free cable concept 査読有り

Matsushita T., Kiuchi M., Otabe E.

Superconductor Science and Technology 25 ( 12 ) 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

An innovative superconducting DC power cable using high-temperature superconducting wires is introduced. The new cable design is proposed to utilize the longitudinal magnetic field effect that was discovered about a half-century ago. It was shown that the critical current density of a superconducting wire could be significantly increased when the superconductor is in a parallel field configuration. It is empirically known that a force-free structure is attained for the current flowing in the superconductor in this case. In the new cable, the outer layer is twisted in such a way that the shielding current flowing in this region generates a magnetic field that is parallel to the inner conductor. As a result, a force-free structure is realized for the wiring in the inner conductor. It is shown that the current carrying capacity of the proposed cable is dramatically improved in comparison with other cables and that the improvement becomes more pronounced with the increase of the current level. © 2012 IOP Publishing Ltd.

DOI： 10.1088/0953-2048/25/12/125009

Scopus

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Improvement of flux pinning performance at high magnetic fields in GdBa <inf>2</inf>Cu <inf>3</inf>O <inf>y</inf> coated conductors with BHO nano-rods through enhancement of B <inf>c2</inf> 査読有り

Matsushita T., Nagamizu H., Tanabe K., Kiuchi M., Otabe E., Tobita H., Yoshizumi M., Izumi T., Shiohara Y., Yokoe D., Kato T., Hirayama T.

Superconductor Science and Technology 25 ( 12 ) 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Addition of BaHfO 3 (BHO) nano-rods as pinning centers into a GdBa 2Cu 3O y (GdBCO) coated conductor dramatically improves the critical current properties in high magnetic fields. This is partly ascribed to the strong flux pinning of these pinning centers. In this paper it is reported that this improvement is mainly caused by unexpected enhancement of the upper critical field, B c2. The mechanism of the enhancement of B c2 is not yet clear, although the strain around the interface between the pinning center and the superconducting matrix or the interface itself may scatter electrons. This result suggests that the critical current property of REBa 2Cu 3O y (RE: rare earth elements, REBCO) coated conductors could be designed not only by tailoring the microstructure of pinning centers but also by controlling the intrinsic superconducting property. Especially, the selection of pinning material and its content that determines B c2 is expected to be a key problem for further improvement of the pinning performance at high magnetic fields. © 2012 IOP Publishing Ltd.

DOI： 10.1088/0953-2048/25/12/125003

Scopus

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Evaluation of critical current density of FeAs-based superconductors 査読有り

Otabe E., Kiuchi M., Matsushita T., Ni B., Qi Y., Wang L., Gao Z., Wang D., Zhang X., Ma Y., Nakajima Y., Tamegai T.

Journal of the Korea Institute of Applied Superconductivity and Cryogenics 14 ( 2 ) 1 - 7 2012年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this review paper, we report the characteristics of the critical current density in FeAs based superconductors which is newly discovered by Hosono group of Tokyo Institute of Technology on 2008. Since the many specimens in present stage are not single crystals, there are two kinds of critical current density observed in the specimens which are so-called local and global critical current densities. Therefore, it is necessary to evaluate both kinds of critical current densities. The history effect in which the global critical current density shows different values in increasing and decreasing magnetic field is also observed when the specimens have the local and the global critical current densities. The wire which critical current is 180 A is successfully developed with using the knowledge of abovementioned characteristics of two kinds of critical current densities and the history effect.

Scopus

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Estimation of critical current densities in polycrystalline Sr <inf>0.6</inf>K<inf>0.4</inf>Fe<inf>2</inf>As<inf>2</inf> Superconductors 査読有り

Ni B., Ge J., Tanaka Y., Otabe E., Kiuchi M., Matsushita T., Gao Z., Wang L., Qi Y., Zhang X., Ma Y.

IEEE Transactions on Applied Superconductivity 21 ( 3 PART 3 ) 2862 - 2865 2011年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

The superconducting Sr0.6K0.4Fe2As 2 (122 type) polycrystalline iron-based pnictides with Pb or Ag addition were prepared by a normal PIT method. The critical current densities were investigated by ac inductive (Campbell's) method. It was found that a fairly large critical current density over 1010 A/m2 even at the relatively high temperatures flows locally with the perimeter size similar to the average grain size of the bulk samples, while an extremely low global critical current density of 104106 A/m 2flows through the whole sample. Furthermore, a unique history dependence of global critical current density was observed, i.e., it shows a smaller critical current density in the increasing-field process than that in the decreasing-field process. Basing on the experimental results of the penetrating ac magnetic flux profile and the characteristic of ac magnetic field vs. penetration depth, the inter- and intra-granular super-current, the weak-link and the history effect in these materials were discussed. © 2010 IEEE.

DOI： 10.1109/TASC.2010.2088092

Scopus

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Critical current properties of Ag added Sr<inf>0.6</inf>K <inf>0.4</inf>Fe<inf>2</inf>As<inf>2</inf> 査読有り

Otabe E., Otabe E., Yoshida N., Kiuchi M., Kiuchi M., Matsushita T., Ge J., Ni B., Ni B., Wang L., Qi Y., Zhang X., Gao Z., Wang D., Ma Y., Ma Y.

Physica C: Superconductivity and its Applications 470 ( SUPPL.1 ) 2010年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The local and global critical current densities of polycrystalline bulks Sr0.6K0.4Fe2As2 were investigated by both the remnant magnetic moment and Campbell's methods. It was found that the global critical current density was improved by addition of Ag. It was speculated that the reason for the enhancement of the global critical current density was ascribed to the enlarged size of particle and the clean boundaries due to addition of Ag. It was also found that the critical current density estimated from usual magnetization measurement was a type of average value of both local and global critical current densities and can be explained by simple contributions from magnetic moments by local and global shielding currents. Therefore, the size of the grain was estimated by the present model and the agreement with the observation by SEM was obtained. © 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2010.01.033

Scopus

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Three-dimensional analysis of BaZrO<inf>3</inf> pinning centers gives isotropic superconductivity in GdBa<inf>2</inf> Cu<inf>3</inf> O <inf>7-δ</inf> 査読有り

Kaneko K., Furuya K., Yamada K., Sadayama S., Sadayama S., Barnard J., Midgley P., Kato T., Hirayama T., Kiuchi M., Matsushita T., Ibi A., Yamada Y., Izumi T., Shiohara Y.

Journal of Applied Physics 108 ( 6 ) 2010年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

BaZrO3 doped GdBa2 Cu3 O 7-δ superconductor was prepared by pulsed layer deposition using a KrF excimer laser, which showed isotropic characteristics of critical current density, JC, for magnetic-field orientations, ∼4.0× 109 A m-2 at 1.0 T. Microstructural and morphological characterization of resulting artificial pinning centers were conducted by transmission electron microscopy and electron tomography, which confirmed the presence of one-dimensional artificial pinning centers, BaZrO3 nanorods. Since there is noticeable anisotropy from GdBa2 Cu 3 O7-δ superconductor without doping BaZrO 3, the pinning observed for all magnetic-field orientations are due to the high density and high dispersion of these BaZrO3 nanorods with very wide angular distributions. © 2010 American Institute of Physics.

DOI： 10.1063/1.3486213

Scopus

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Influence of nanoparticles on critical current properties in TFA-MOD processed YGdBCO coated conductor 査読有り

Masaru Kiuchi,Fumiya Matsutani,Yuji Takahashi,Edmund S. Otabe,Teruo Matsushita,Masashi Miura,Teruo Izumi,Yuh Shiohara

Journal of Physics: Conference Series 234 022018 - 022018 2010年04月

Evaluation of geometrical effect on magnetization loss in GdBCO coated conductor 査読有り

Y. Nakayama,M. Kiuchi,E.S. Otabe,T. Matsushita,H. Okamoto,T. Saito,T. Izumi

Physica C 470 1315 - 1317 2010年04月

Critical current characteristics and history dependence in superconducting SmFeAsOF bulk 査読有り

B. Ni,J. Ge,M. Kiuchi,E.S. Otabe,Z. Gao,L. Wang,Y. Qi,X. Zhang,Y. M

Journal of Physics: Conference Series 234 012028 - 012028 2010年04月

Estimation of magnetic relaxation property for CVD processedYBCO-coated conductors 査読有り

Y. Takahashi,M. Kiuchi,E.S. Otabe,T. Matsushita,K. Shikimachi,T. Watanabe ,N. Kashima,S. Nagaya

Physica C 470 1284 - 1287 2010年04月

Critical current density properties in polycrystalline Sr0.6K0.4Fe2As2 superconductor 査読有り

N. Yoshida,M. Kiuchi,E.S. Otabe,T. Matsushita,J. Ge,B. Ni,L. Wang,Y. Qi ,X. Zhang,Z. Gao,Y. Ma

Physica C 470 1216 - 1218 2010年04月

Influence of nanoparticles on flux pinning properties in TFA-MOD processed YGdBCO coated conductor 査読有り

F. Matsutani,Y. Takahashi,M. Kiuchi,E.S. Otabe,T. Matsushita,M. Miura,T. Izumi,Y. Shiohara

Physica C 470 1411 - 1414 2010年04月

Critical current properties at high magnetic fields in polycrystallineMgB2 superconductors 査読有り

T. Matsushita,M. Kiuchi,E.S. Otabe,A. Yamamoto,J. Shimoyama,K. Kishio

Physica C 470 1406 - 1410 2010年04月

Bi-2223 superconducting magnet generating over 1T in liquid nitrogen 査読有り

E. S. Otabe,S. Nemoto,M. Kiuchi,T. Matsushita,T. Hayashi,K. Fujino,B. Ni

Journal of Physics: Conference Series 234 032046 - 032046 2010年04月

Effect of number of filaments on the critical current densityin multifilamentary Bi-2223 tape 査読有り

S. Ueno,S. Yamashita,M. Kiuchi,E.S. Otabe,T. Matsushita,N. Ayai,M. Kikuchi,K. Hayashi,K. Sato

Physica C 470 1380 - 1383 2010年04月

IBAD/CVD-YBCOテープ線材のピンニング特性の超電導層厚依存性査読有り

高橋祐治,姫木携造,木内勝,松下照男,式町浩二,渡部智則,鹿島直二,長屋重夫

低温工学 44 ( 12 ) 565 - 572 2009年12月

RE-211相粒子を添加した(Nd, Eu, Gd)Ba2Cu3Oy超電導体の高温度領域の磁束ピンニング特性査読有り

木内勝,Mohammed N. HASAN,小田部荘司,松下照男,Miryala MURALIDHAR

低温工学 44 ( 12 ) 579 - 586 2009年12月

Evaluation of anisotropy of critical current density in stoichiometric Bi-2212 single crystals 査読有り

Y. Nakayama,S. Kawai,M. Kiuchi,E.S. Otabe,T. Matsushita,J. Shimoyama,K. Kishio

Physica C 469 1221 - 1223 2009年04月

Superconducting layer thickness of relaxation properties of persistent current in high magnetic field in YBCO-coated conductor 査読有り

F. Matsutani,K. Himeki,M. Kiuchi,E.S. Otabe,T. Matsushita,S. Miyata,A. Ibi,Y. Yamada,Y. Shiohara

Physica C 469 1122 - 1125 2009年04月

Global and local critical current density in superconducting SmFeAsO$_{1-x}$F$_x$ measured by two methods 査読有り

E.S. Otabe,M. Kiuchi,S. Kawai,Y. Morita,J. Ge,B. Ni,Z. Gao,L. Wang,Y. Qi,X. Zhang,Y. Ma

Physica C 469 1940 - 1944 2009年04月

AC Magnetic Flux Profile and Critical Current Density Obtained by Campbell's Method in Polycrystalline MgB$_2$ 査読有り

B. Ni,Y. Morita,Z. Liu,C. Liu,K. Himeki,E. S. Otabe,M. Kiuchi,T. Matsushtia

IEEE Trans. on Appl. Supercond. 19 3529 - 3532 2009年04月

Fabrication of a working Bi-2223 superconducting magnet cooled by liquid nitrogen 査読有り

E.S. Otabe,M. Kiuchi,T. Matsushita,K. Fujino,K. Ohmatsu,B. Ni

Cryogenic 49 267 - 270 2009年04月

Evaluation of critical current density in multifilamentary Bi-2223 tapes with different lead compositions 査読有り

S. Ueno,S. Takayama,M. Kiuchi,E.S. Otabe,T. Matsushita,N. Ayai,M. Kikuchi,K. Hayashi,K. Sato

Physica C 469 1485 - 1487 2009年04月

Dependence of superconducting layer thickness on critical current density of IBAD/CVD-processed YBCO coated conductors 査読有り

K. Himeki,M. Kiuchi,E.S. Otabe,T. Matsushita,K. Shikimachi,T. Watanabe,N. Kashima,S. Nagaya,Y. Yamada,Y. Shiohara

Physica C 469 1457 - 1460 2009年04月

超電導MgB2線材および薄膜の磁束ピンニング特性査読有り

木内勝,松下照男

低温工学 43 ( 8 ) 349 - 353 2008年08月

Bi-2223 superconducting magnet working in sub cooled liquid nitrogen 査読有り

E. S. Otabe,M. Kiuchi,T. Matsushita,T. Hayashi,K. Ohmatsu,B. Ni

Proceedings of the Twenty-Second International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2008 889 - 893 2008年07月

Effect of heavy ion irradiation on critical current property in DyBCOcoated conductors 査読有り

G. Isobe,M. Kiuchi,E.S. Otabe,T. Matsushita,S. Okayasu,W. Prusseit

Physica C 468 1656 - 1660 2008年04月

Flux pinning properties of Columnar Defects Nucleated by Heavy Ion Irradiation in DyBCO coated conductor 査読有り

M.Kiuchi,G.Isobe,T.Matsushita,S.Okayasu,W.Prusseit

IEEE Transactions on applied superconductivity 19 3475 - 3478 2008年04月

Evaluation of field-angle anisotropy of critical current in multifilamentary　Bi-2223 tapes prepared by CT-OP process 査読有り

S. Takayama,M. Kiuchi,E.S. Otabe,T. Matsushita,N. Ayai,J. Fujikami,K. Hayashi,K. Sato

Physica C 468 1779 - 1682 2008年04月

Relaxation properties of persistent current in YBCO-coated conductors 査読有り

K. Himeki,M. Kiuchi,E.S. Otabe,T. Matsushita,S. Miyata,A. Ibi,Y. Yamada,Y. Shiohara

Physica C 468 1674 - 1678 2008年04月

Estimation of critical current density and grain　connectivity in superconducting MgB2 bulk using Campbell's method 査読有り

B. Ni,Y. Morita,Z. Liu,C. Liu,K. Himeki,E.S. Otabe,M. Kiuchi,T. Matsushita

Physica C 468 1443 - 1446 2008年04月

Essential Factors for the critical current density in superconducting MgB2: connectivity and flux pinning by grain boundaries 査読有り

T. Matsushita,M. Kiuchi,A. Yamamoto,J. Shimoyama,K. Kishio

Superconductor Science and Technology 2008 015008(7pp) - 015008(7pp 2008年01月

Dependence of superconducting layer thickness on critical current density of YBCO-coated conductors at high temperatures 査読有り

K. Kimura,M. Kiuchi,E.S. Otabe,T. Matsushita,S. Miyata,A. Ibi,Y. Yamada,Y. Shiohara

Physica C 463-465 697 - 701 2007年08月

Critical current properties in high-temperature superconducting wires and tapes 査読有り

T. Matsushita,M. Kiuchi,K. Kimura,S. Takayama,Y. Yamada,Y. Shiohara,J. Fujikami,K. Hayashi,K. Sato

Physica C 463-465 686 - 691 2007年08月

Critical current properties in multifilamentary Bi-2223 tape produced by the over pressure processing 査読有り

M. Kiuchi,S. Takayama,E.S. Otabe,T. Matsushita,J. Fujikami,K. Hayashi,K. Sato

Physica C 463-465 825 - 828 2007年08月

Evaluation of film thickness dependency of the reversible fluxoid motion in the third harmonic voltage method 査読有り

T. Yoshida,M. Shibata,M. Kiuchi,E.S. Otabe,T. Matsushita,M. Futamura,H. Konishi,S. Miyata,A. Ibi,Y. Yamada,Y. Shiohara

Physica C 463-465 692 - 696 2007年08月

The dependence of pinning properties on superconducting layer thickness in IBAD/PLD YBCO-coated conductors 査読有り

T. Matsushita,K. Kimura,M. Kiuchi,Y. Yamada,Y. Shiohara

Superconductor Science and Technology 20 S189 - S196 2007年04月

Effect of heavy ion irradiation on the critical current density in DyBCO coated conductors 査読有り

T. Matsushita,G. Isobe,K. Kimura,M. Kiuchi,S. Okayasu,W. Prusseit

Superconductor Science and Technology 2007年04月

Flux pinning properties of (Nd, Eu, Gd)Ba2Cu3Oy (NEG-123) superconductor with 211 phase particles 査読有り

M. N. Hasan,M. Kiuchi,E.S. Otabe,T. Matsushita,M. Muralidhar

Superconductor Science and Technology 20 345 - 350 2007年04月

Distribution of the critical current density in a mono-core Bi-2223 tape prepared by the over pressure processing 査読有り

M. Kiuchi,E.S.Otabe,T. Matsushita,J.Fujikami,K.Hayashi,K.Sato

7th European Conference on Applied Supersonductivity 43 79 - 82 2006年09月

Effect of over pressure sintering for Bi-2223 silver-sheathed tape 査読有り

Y. Himeda,M. Kiuchi,E.S. Otabe,T. Matsushita,J. Fujikami,K. Hayashi,K. Sato

Physica C 445-448 722 - 725 2006年09月

Influence of anisotropy and pinning centers on critical current properties in Bi-2212 superconductors 査読有り

T. Haraguchi,S. Takayama,M. Kiuchi,E.S. Otabe,T. Matsushita,T. Yasuda,S. Okayasu,S. Unida,J. Shimoyama,K. Kishio

Physica C 445-448 123 - 127 2006年09月

Condensation energy density of superconducting Bi-2223 single crystals 査読有り

E.S. Otabe,I. Kohno,M. Kiuchi,T. Matsushita,T. Nomura,T. Motohashi,M. Karppinen,H. Yamauchi,S. Okayasu

Advances in Cryogenic Engineering 52 805 - 812 2006年09月

Film thickness dependence of critical current characteristics of YBCO-coated conductors 査読有り

K. Kimura,M. Kiuchi,E.S. Otabe,T. Matsushita,S. Miyata,A. Ibi,T. Muroga,Y. Yamada,Y. Shiohara

Physica C 445-448 141 - 145 2006年09月

Critical current characteristics in MgB2 bulks 査読有り

M. Kiuchi,H. Mihara,K. Kimura,T. Haraguchi,E.S. Otabe,T. Matsushita,A. Yamamoto,J. Shimoyama,K. Kishio

Physica C 445-448 474 - 477 2006年09月

Condensation energy density in Bi-2212 superconductors 査読有り

T. Matsushita,M. Kiuchi,T. Haraguchi,T. Imada,K. Okamura,S. Okayasu,S. Uchida,J. Shimoyama,K. Kishio

Superconductor Science and Technology 19 200 - 205 2006年01月

Generation of highly stable DC current by using a superconducting transformer 査読有り

B. Ni,S Hakoda,E.S. Otabe,M. Kiuchi

Journal of Physics: Conference Series 43 837 - 840 2005年09月

Thickness dependence of pinning properties in Bi-2212 superconductor 査読有り

T. Matsushita,M. Kiuchi,T. Yasuda,H. Wada,T. Uchiyama,I. Iguchi

Supercond. Sci. Technol. 18 1348 - 1353 2005年09月

Flux pinning characteristics of YBCO coated conductor 査読有り

T. Matsushita,T. Watanabe,Y. Fukumoto,K. Yamauchi,M. Kiuchi,E.S. Otabe,T. Kiss,T. Watanabe,S. Miyata,A. Ibi,T. Muroga,Y. Yamada,Y. Shiohara

Physica C 426-431 1096 - 1102 2005年07月

Temperature Dependence of AC Transport Current Loss of QMGBulk Superconductor 査読有り

E. S. Otabe,T. Watanabe,M. Kiuchi,T. Matsushita,M. Morita

Japanese Journal of Applied Physics 44 ( 10 ) 7436 - 7439 2005年07月

Numerical calculation of third harmonic voltage induced byashielding current in a superconducting thick film 査読有り

T. Nadami,E. S. Otabe,M. Kiuchi,T. Matsushita,Y. Mawatari,H. Yamasaki,Y. Nagkagawa

Physica C 426-431 688 - 692 2005年07月

Critical current density at low temperatures in Bi-2212　superconductor with small anisotropy 査読有り

T. Haraguchi,T. Imada,M. Kiuchi,E. S. Otabe,T. Matsushita,T. Yasuda,S. Okayasu,S. Uchida,J. Shimoyama,K. Kishio

Physica C 426-431 304 - 308 2005年07月

第三高調波電圧誘導法を用いた超電導薄膜のJc評価に及ぼす磁束線の可逆運動の影響査読有り

福元陽介,木内勝,小田部荘司,松下照男,木須隆暢(九州大学),渡部智則(超電導工学研究所),宮田成紀(超電導工学研究所),衣斐顕(超電導工学研究所),室賀岳海(超電導工学研究所),山田穣(超電導工学研究所),塩原融(超電導工学研究所)

TEION KOUGAKU (J. Cryo. Soc. Jpn.) 40 ( 4 ) 116 - 122 2005年04月

Bending strain effect on critical current of Bi-2223superconductor tapes---report of international round-robin-test 査読有り

T. Kuroda,K. Itoh,K. Katagiri,W. Goldacker,W. haessler,B. ten Haken,M. Kiuchi,K. Noto,S. Ochiai,S. Otabe,H.S. Shin,J. Sosnowski,H. Weijers,H. Wada,K. Kumakura

Physica C 425 111 - 120 2005年04月

Evaluation of anisotropy of Jc in silver-sheathedBi-2223 tape 査読有り

Y. Himeda,M. Kiuchi,E. S. Otabe,T. Matsushita

Physica C 426-431 1170 - 1175 2005年04月

Relationship between condensation energy and dimensionality of Bi-2212 superconductor 査読有り

K. Okamura,M. Kiuchi,E.S. Otabe,T. Matsushita,T. Yasuda,S. Okayasu,S. Uchida,J. Shimoyama,K. Kishio

Physica C 412-414 416 - 421 2004年08月

Evaluation of E-J characteristics of YBCO coated-conductor by AC inductive method using third-harmonic voltage 査読有り

Y. Fukumoto,M. Kiuchi,E.S. Otabe,T. Matsushita,H. Sawa,M. Inoue,T. Kiss,Y. Iijima,K. Kakimoto,T. Saitoh

Physica C 412-414 1036 - 1040 2004年08月

Effect of sheath material on critical current characteristics of MgB2 at high temperatures 査読有り

M. Kiuchi,K. Yamauchi,T. Kurokawa,E.S. Otabe,T. Matsushita,M. Okada,K. Tanaka,H. Kumakura,H. Kitaguchi

Physica C 412-414 1189 - 1193 2004年08月

Dependence of induced third harmonic voltage on width of superconducting coated conductor 査読有り

T. Nadami,E.S. Otabe,M. Kiuchi,T. Matsushita

Physica C 412-414 1011 - 1014 2004年08月

V-I characteristics and n-value of multifilamentary NbTi wires 査読有り

K. Tsuchiya,T. Kobayashi,A. Terashima,T. Shintomi,N. Banno,K. Itoh,S. Nimori,T. Takeuchi,E.S. Otabe,M. Kiuchi,T. Matsushita

Proceedings of the 6the European Conference on Applied Superconductivity 2298 - 2305 2004年04月

The pinning property of Bi-2212 single crystals with columnar defects 査読有り

K. Okamura,M. Kiuchi,E.S. Otabe,T. Yasuda,T. Matsushita,S. Okayasu

Superconductor Science and Technology 17 S20 - S24 2004年03月

The evaluation of E-J characteristics of Bi-2223 silver-sheathed tape in a wide range of electric field 査読有り

M. Kiuchi,Y. Himeda,Y. Fukumoto,E.S. Otabe,T. Matsushita

Superconductor Science and Technology 17 S10 - S14 2004年02月

Numerical calculation of critical current density and third harmonic voltage in superconducting films 査読有り

H. Wada,M. Migita,E.S. Otabe,M. Kiuchi,T. Matsushita,Y. Mawatari(AIST),H. Yamasaki(AIST),Y. Nakagawa(AIST)

Physica C 392-396 1310 - 1314 2003年08月

Angular dependence of irreversibility field in Y-123 coated tape 査読有り

M. Kiuchi,E.S. Otabe,T. Matsushita,T. Kuga,M. Inoue,T. Kiss,Y. Iijima,K. Kakimoto,T. Saitoh

Physica C 392-296 1063 - 1067 2003年08月

Evaluation of E-J characteristics of YBCO-coated conductor in a wide range of electric field 査読有り

K. Yamauchi,M. Kiuchi,E.S. Otabe,T. Matsushita,T. Kuga(Kyushu Univ.),M. Inoue(Kyushu Univ.),T. Kiss(Kyushu Univ.),Y. Iijima(Fujikura Ltd.),K. Kakimoto(Fujikura Ltd.),T. Saitoh(Fujikura Ltd.)

Physica C 392-396 1073 - 1077 2003年08月

Enhancement of critical current density and flux pinning in Bi-2212 thick films due to MgO addition 査読有り

B. Ni,M. Kiuchi,E.S. Otabe

IEEE Trans. on Appl. Superconduct. 13 ( 2 ) 3695 - 3698 2003年06月

Pinning property of Bi-2212 single crystals with columnar defects 査読有り

E.S.Otabe,K. Okamura,H. Wada,M. Kiuchi,T. Yasuda,S. Okayasu,T. Matsushita

IEEE Trans. on Appl. Superconduct. 13 ( 2 ) 3083 - 3086 2003年06月

Y-123 coated tapeの臨界電流密度と不可逆磁界の印加磁界角度依存性

木内勝,小田部荘司,松下照男,久我隆礼(九大),井上昌睦(九大),木須隆暢(九大),飯島康裕(フジクラ),柿本一臣(フジクラ),斎藤隆(フジクラ)

超伝導科学研究センター報告 10 89 - 96 2003年03月

Theoretical analysis of E-J characterisitcs in a Bi-2223 silver-sheathed tape 査読有り

T. Kodama,M. Fukuda,S. Nishimura,E.S. Otabe,M. Kiuchi,T. Kiss,T. Matsushita,K. Itoh

Physica C 378-381 575 - 579 2002年06月

Irreversibility field of Bi-2223 silver-sheathed tape determined with different electric field criteria 査読有り

M. Fukuda,T. Kodama,K. Shiraishi,S. Nishimura,E.S. Otabe,M. Kiuchi,T. Kiss,T. Matsushita,K. Itoh

Physica C 357-360 586 - 589 2001年04月

E-J characteristics in a wide range of electric field for a Bi-2223 silver-sheathed tape wire 査読有り

T. Kodama,M. Fukuda,K. Shiraishi,S. Nishimura,E.S. Otabe,M. Kiuchi,T. Kiss,T. Matsushita,K. Itoh

Physica C 357-360 582 - 585 2001年04月

Transport E-J characteristics in Bi-2223 tape under the influence of bending strain: analysis by use of the percolation model 査読有り

T. Kiss,K. Oda,S. Nishimura,M. Inoue,M. Kiuchi,T. Matsushita,K. Ito

Physica C, Vol. 357-360 (2001) 357-360 1123 - 1127 2001年04月

Anisotropic transport E(J) characteristics in Bi-2223 Ag-sheathed tape as a function of temperature and magnetic field 査読有り

S. Nishimura,M. Inoue,K. Oda,M. Kiuchi,T. Kiss,M. Takeo,T. Matsushita

Physica C 357-360 1186 - 1189 2001年04月

Angular dependence of E-J characteristics under high magnetic fields in YBCO thin films 査読有り

M. Inoue,T. Kiss,M. Kiuchi,M. Takeo,S. Awaji,K. Watanabe

Physica C 357-360 273 - 276 2001年04月

Bi-2223銀シーステープ線材の超低電界領域のE-J特性の評価査読有り

児玉武士,福田光洋,白石和男,小田部荘司,木内勝,木須隆暢,松下照男,伊藤喜久男

低温工学 35 ( 11 ) 523 - 529 2000年12月

Inhomogeneous distribution of flux pinning strength and Its effect on irreversibility line and vortex glass-liquid transition line in Bi-2212 Tapes 査読有り

M. Kiuchi,T. Matsushita,Y. Nakayama,N. Takase

IEEE Transactions on Applied Superconductivity 9 ( 2 ) 1892 - 1895 2000年04月

Anisotropy of E-J Characteristics in YBCO Superconductors 査読有り

M. Inoue,M. Kiuchi,T. Kiss,M. Takeo,T. Matsushita,S. Awaji,K. Watanabe

Advances in Superconductivity XII 1 389 - 391 2000年04月

Current-Voltage Curves of a Bi-2212/Ag Multilayered Tape Prepared by PAIR Process 査読有り

A. Yamasaki,Y. Ueno,M. Kiuchi,T. Matsushita,H. Miao,H. Kumakura,H. Kitaguchi

Advances in Superconductivity XII 1 407 - 409 2000年04月

Distribution of flux pinning strength in a superconducting Bi-2223 silver-sheathed tape 査読有り

M. Kiuchi,A. Yamasaki,T. Matsushita,J. Fujikami,K. Ohmatsu

Physica C 315 241 - 246 1999年04月

Effect of distribution of flux pinning strength on irreversibility line and vortex glass-liquid transition line in a Bi-2212 tape wire 査読有り

Y. Nakayama,N. Takase,M. Kiuchi,T. Matsushita,T. Hasegawa

Physica C 315 235 - 240 1999年04月

Force-displacement characteristics of fluxoids along the c-axis in superconducting Bi-2212 single crystal near the peak field 査読有り

M. Kiuchi,H. Yamato,T. Hirano,T. Matsushita,N. Koshizuka

Physica C 297 161 - 165 1998年04月

Peak effect of critical current in a Bi-2212 superconducting single crystal 査読有り

T. Matsushita,T. Hirano,H. Yamato,M. Kiuchi,Y. Nakayama,J. Shimoyama,K. Kishio

Superconductor Science and Technology 11 925 - 928 1998年04月

Peak effect of critical current in an untwinned Y-123 superconducting single crystal 査読有り

T. Matsushita,H. Yamato,K. Yoshimitsu,M. Kiuchi,A. I. Rykov,S. Tajima,N. Koshizuka

Superconductor Science and Technology 11 1173 - 1176 1998年04月

Peak effect in Bi-2212 single crystal at low magnetic field 査読有り

T. Hiramo,H. Yamato,M. Kiuchi,T. Matsushita,Y. Nakayama,J. Shimoyama,K. Kishio

Advances in Superconductivity X 1 545 - 548 1998年04月

Distribution of critical current density in a superconducting Bi-2223 tape wire 査読有り

M. Kiuchi,A. Yamasaki,T. Matsushita,J. Fujikami,K. Ohmatsu,K. Sato

Advances in Superconductivity X 1 513 - 516 1998年04月

Effect of distribution of flux pinning strength on irreversibility line and transition line 査読有り

Y. Nakayama,N. Takase,M. Tagomori,M. Kiuchi,T. Matsushita

Advances in Superconductivity X 1 509 - 512 1998年04月

Flux pinning property in Y-123 single crystal 査読有り

H. Yamato,M. Kiuchi,T. Matsushita,A. I. Ryokov,S. Tajima,N. Koshizuka

Advances in Superconductivity X 1 501 - 504 1998年04月

Dependence of irreversibility field on the thickness of superconducting layer 査読有り

M. Tagomori,M. Kiuchi,T. Matsushita,T. Hasegawa

Advances in Superconductivity X 1 529 - 532 1998年04月

Scaling of current-voltage curves of Bi-2212 tape wire 査読有り

M. Kiuchi,K. Noguchi,M. Tagomori,T. Matsushita,T. Hasegawa

IEEE Transactions on Applied Superconductivity 6 ( 2 ) 2114 - 2117 1997年04月

Longitudinal elastic correlation length of flux lines along the c-axis in superconducting Bi-2212 single crystal in the field near the peak effect 査読有り

T. Matsushita,M. Kiuchi,H. Yamato,T. Hirano,N. Koshizuka

Physica C 277 285 - 291 1997年04月

Scaling of current-voltage characteristics in superconducting Bi-2223 silver-sheathed tape wires 査読有り

M. Kiuchi,K. Noguchi,T. Matsushita,T. Kato,T. Hikata,K. Sato

Physica C 278 62 - 70 1997年04月

Effect of reversible fluxoid motion in superconducting Bi-2223 multifilamentary wire 査読有り

E.S. Otabe,H. Matsuoka,M. Kiuchi,T. Matsushita,J. Fujikami,K. Sato

Physica C 282-287 2339 - 2340 1997年04月

Longitudinal elastic correlation length of flux lines along the c-Axis in superconducting Bi-2212 single crystal 査読有り

M. Kiuchi,H. Yamato,T. Matsushita

Physica C 269 242 - 248 1996年04月

Pinning-force density of superconducting Bi-2223 tape wires 査読有り

M. Kiuchi,E.S. Otabe,T. Matsushita,T. Kato,T. Hikata,K. Sato

Physica C 260 177 - 187 1996年04月

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