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675 results on '"Kitaguchi H"'

1. High-Temperature Crack Growth Characteristics Under Dwell-Fatigue in a PM Superalloy for Disc Applications

Author

Li, H. Y., Hardy, M. C., Lee, C. Y. N., Doel, T. J. A., Jiang, J. Y., Kitaguchi, H. S., Buckingham, R. C., Bowen, P., Cormier, Jonathan, editor, Edmonds, Ian, editor, Forsik, Stephane, editor, Kontis, Paraskevas, editor, O’Connell, Corey, editor, Smith, Timothy, editor, Suzuki, Akane, editor, Tin, Sammy, editor, and Zhang, Jian, editor

Published
2024
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2. Theoretical demonstration of highly efficient cw THz generation by using composite photonic-structure elements

Author

Oyamada A., Kitaguchi H., Ebata K., and Ishihara H.

Subjects
thz generation, one-dimensional photonic crystal, difference frequency generation, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

We theoretically propose one-dimensional composite photonic structures for high-resolution THz spectroanalysis. We compare the performance of two GaAs/AlAs composite photonic-structure devices, one with usual 1/4-wavelength layers of distributed Bragg reflectors (DBRs), and the other with the designed DBRs. The device with designed DBRs shows the optical-to-terahertz conversion efficiency up to 10−5 and wide frequency tunability ranging from sub-THz to 3 THz. We found that the composite photonic structure allows us to control photonic modes with a high degree of freedom by flexible structure designs. This device achieve a cw THz source with a highly narrow bandwidth operating at room temperature.

Published
2013
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3. Developing Alloy Compositions for Future High Temperature Disk Rotors

Author

Hardy, M. C., Argyrakis, C., Kitaguchi, H. S., Wilson, A. S., Buckingham, R. C., Severs, K., Yu, S., Jackson, C., Pickering, E. J., Llewelyn, S. C. H., Papadaki, C., Christofidou, K. A., Mignanelli, P. M., Evans, A., Child, D. J., Li, H. Y., Jones, N. G., Rae, C. M. F., Bowen, P., Stone, H. J., Tin, Sammy, editor, Hardy, Mark, editor, Clews, Justin, editor, Cormier, Jonathan, editor, Feng, Qiang, editor, Marcin, John, editor, O'Brien, Chris, editor, and Suzuki, Akane, editor

Published
2020
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6. Uniaxial Tensile Stress Tolerance of Ultra-Thin Nb3Sn Composite Wires and Twisted Cables

Author

Sugano, M., Kikuchi, A., Kitaguchi, H., Nishijima, G., and Yagai, T.

Abstract

Ultra-thin A15 composite wires with a diameter of 0.03–0.05 mm are being developed by National Institute for Materials Science (NIMS) to realize flexible Rutherford cables for high field superconducting accelerator magnets. Since the bending strain is approximately proportional to the wire diameter, a cable composed of thin wires can be bent to a smaller bending diameter without the degradation of critical current (Ic). Thus, react-and-wind cables with ultra-thin Nb3Sn wires are expected to be realized. In our previous study, the basic mechanical properties including fracture strength and Young's modulus of 0.05-mm-thick bronze-processed Nb3Sn wires were evaluated by a single- fiber tensile test. As a next step, in this study, a tensile test was conducted for a twisted cable with 19 0.05-mm-thick wires at room temperature to confirm whether the mechanical strength of the twisted cable can be predicted from that of the single wire. The stress tolerance of the single wire and twisted cable was assessed by measuring Ic at 4.2 K after applying various uniaxial tensile loads at room temperature. The tensile stress limit of Ic was compared between the single wire and twisted cable.

Published
2024
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8. Developing Alloy Compositions for Future High Temperature Disk Rotors

Author

Hardy, M. C., primary, Argyrakis, C., additional, Kitaguchi, H. S., additional, Wilson, A. S., additional, Buckingham, R. C., additional, Severs, K., additional, Yu, S., additional, Jackson, C., additional, Pickering, E. J., additional, Llewelyn, S. C. H., additional, Papadaki, C., additional, Christofidou, K. A., additional, Mignanelli, P. M., additional, Evans, A., additional, Child, D. J., additional, Li, H. Y., additional, Jones, N. G., additional, Rae, C. M. F., additional, Bowen, P., additional, and Stone, H. J., additional

Published
2020
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9. Effect of aromatic hydrocarbon addition on in situ powder-in-tube processed MgB2 tapes

Author

Yamada, H., Hirakawa, M., Kumakura, H., and Kitaguchi, H.

Subjects
Condensed Matter - Superconductivity
Abstract

We fabricated in situ powder-in-tube processed MgB2/Fe tapes using aromatic hydrocarbon of benzene, naphthalene, and thiophene as additives, and investigated the superconducting properties. We found that these aromatic hydrocarbons were very effective for increasing the Jc values. The Jc values of 20mol% benzene-added tapes reached 130A/mm2 at 4.2K and 10T. This value was almost comparable to that of 10mol% SiC-added tapes and about four times higher than that of tapes with no additions. Microstructure analyses suggest that this Jc enhancement is due to both the substitution of carbon for boron in MgB2 and the smaller MgB2 grain size., Comment: 6 pages, 4 figures

Published
2005
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10. Strain Effect in MgB2/Stainless Steel Superconducting Tape

Author

Kitaguchi, H., Kumakura, H., and Togano, K.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science
Abstract

The influence of mechanical strain on the critical current (Ic) is investigated for MgB2/stainless steel (SUS316) superconducting tapes. The tapes are fabricated by using 'powder in tube' method and deformation process without any heat treatment. The tensile axial strain along tape length is successfully induced to the sample by using a U-shape holder made of stainless steel (SUS304). Two samples are examined at 4.2 K in 5 T (B is applied perpendicular to the tape surface). While the initial Ic at zero external strain state (Ic0) varies (30.4 and 33.3 A), normalized Ic (Ic/Ic0) vs. external strain relations fall on the same curve. Linear increase of Ic is observed from zero external strain state to 0.5% strain (107% of Ic0). Rapid and large degradation occurs at the strain exceeding 0.4-0.5%. High durability against stress can be expected for MgB2/stainless steel superconducting tapes., Comment: 3 pages including 2 figures, submitted to Physica C

Published
2001
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29. Mechanical Properties of Ultra-Thin Nb3Sn Composite Wires

Author

Sugano, M., Kikuchi, A., Kitaguchi, H., Nishijima, G., and Yagai, T.

Abstract

Flexible Rutherford cables are needed to realize high field superconducting magnets with A15 conductors based on the react-and-wind (R&W) technology. Aiming such an application, ultra-thin A15 composite wires with a diameter of 0.03–0.05 mm have been developed by the National Institute for Materials Science (NIMS). Mechanical properties of such ultra-thin Nb3Sn wires were evaluated to determine the cabling parameters and mechanical analysis of twisted cables. Tensile tests were performed at room temperature for 0.05 mm-thick Nb3Sn wires before and after heat treatment for the first time. Basic mechanical parameters such as 0.2% proof strength and fracture strength were evaluated from a stress–strain curve. Young's modulus of such a thin wire was determined from unlading and reloading slopes of a load–stroke curve for the specimens with different gauge lengths. Fracture strain was estimated without using extensometers and strain gauges by correcting for machine deformation. Based on these results, we concluded that a simple technique to measure stress–strain curves for ultra-thin Nb3Sn wires was able to be established.

Published
2023
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42. Development of a persistent-mode NMR magnet with superconducting joints between high-temperature superconductors

Author

Yanagisawa, Y, primary, Piao, R, additional, Suetomi, Y, additional, Yamazaki, T, additional, Yamagishi, K, additional, Ueno, T, additional, Takao, T, additional, Ohki, K, additional, Yamaguchi, T, additional, Nagaishi, T, additional, Kitaguchi, H, additional, Miyoshi, Y, additional, Yoshikawa, M, additional, Hamada, M, additional, Saito, K, additional, Hachitani, K, additional, Ishii, Y, additional, and Maeda, H, additional

Published
2021
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43. Progress in performance of DI-BSCCO family

Author

Ayai, N., Kobayashi, S., Kikuchi, M., Ishida, T., Fujikami, J., Yamazaki, K., Yamade, S., Tatamidani, K., Hayashi, K., Sato, K., Kitaguchi, H., Kumakura, H., Osamura, K., Shimoyama, J., Kamijyo, H., and Fukumoto, Y.

Published
2008
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45. Development of a Bi-2223 HTS magnet for 3T MRI system for human brains

Author

Kitaguchi, H., Ozaki, O., Miyazaki, T., Ayai, N., Sato, K.-i., Urayama, S.-i., and Fukuyama, H.

Subjects
Bismuth -- Magnetic properties, Bismuth -- Electric properties, Bismuth -- Thermal properties, Brain research -- Technology application, High temperature superconductors -- Design and construction, Technology application, Business, Electronics, Electronics and electrical industries
Published
2010

46. Production and operation of a 15 T Nb-Ti/[Nb.sub.3]Al hybrid magnet system powered by a single power supply

Author

Takeuchi, T., Banno, N., Iijima, Y., Kikuchi, A., Kitaguchi, H., Yoshikawa, M., Tagawa, K., and Nakagawa, K.

Subjects
Aluminum alloys -- Magnetic properties, Aluminum alloys -- Electric properties, Magnetic flux -- Measurement, Niobium -- Magnetic properties, Niobium -- Electric properties, Superconducting magnets -- Design and construction, Business, Electronics, Electronics and electrical industries
Published
2010

47. Critical current characteristics of Bi2212 round wires prepared by isothermal partial melting method

Author

Takahashi, K.-i., Nakane, T., Matsumoto, A., Kitaguchi, H., and Kumakura, H.

Subjects
Bismuth -- Electric properties, Bismuth -- Thermal properties, Copper oxide superconductors -- Electric properties, Copper oxide superconductors -- Thermal properties, Electric currents -- Measurement, Silver alloys -- Electric properties, Silver alloys -- Thermal properties, Business, Electronics, Electronics and electrical industries
Published
2009

48. Electrical and mechanical properties of DI-BSCCO type HT reinforced with metallic sheathes

Author

Ayai, N., Yamazaki, K., Kikuchi, M., Osabe, G., Takaaze, H., Takayama, H., Kobayashi, S.-i., Fujikami, J., Hayashi, K., Sato, K.-i., Osamura, K., Kitaguchi, H., Matsumoto, S., Kiyoshi, T., and Shimoyama, J.-i.

Subjects
Bismuth -- Electric properties, Bismuth -- Mechanical properties, Bismuth -- Magnetic properties, Copper alloys -- Electric properties, Copper alloys -- Mechanical properties, Copper alloys -- Magnetic properties, High temperature superconductors -- Mechanical properties, Business, Electronics, Electronics and electrical industries
Published
2009

49. Angular dependence of critical current in coated conductors at 4.2 K and magnet design

Author

Uglietti, D., Kitaguchi, H., Seyong Choi, and Kiyoshi, T.

Subjects
Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Copper oxide superconductors -- Magnetic properties, Copper oxide superconductors -- Electric properties, Electric currents -- Measurement, Superconducting magnets -- Design and construction, Yttrium -- Magnetic properties, Yttrium -- Electric properties, Business, Electronics, Electronics and electrical industries
Published
2009

50. Superconducting properties and microstructures of Mg[B.sub.2] thin films fabricated with the precursor and post-annealing method

Author

Matsumoto, A., Takahashi, K.-i., Tachiki, M., Kitaguchi, H., and Kumakura, H.

Subjects
Aluminum oxide -- Electric properties, Aluminum oxide -- Thermal properties, Aluminum oxide -- Magnetic properties, Magnesium compounds -- Electric properties, Magnesium compounds -- Thermal properties, Magnesium compounds -- Magnetic properties, Superconductivity -- Analysis, Business, Electronics, Electronics and electrical industries
Published
2009

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