The Experts below are selected from a list of 56931 Experts worldwide ranked by ideXlab platform
Michinaka Sugano - One of the best experts on this subject based on the ideXlab platform.
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The effect of the 2D Internal Strain state on the critical current in GdBCO coated conductors
Superconductor Science and Technology, 2012Co-Authors: Michinaka Sugano, Shutaro Machiya, Hidetoshi Oguro, Masugu Sato, Tomoyuki Koganezawa, Tomonori Watanabe, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya, Teruo IzumiAbstract:A reversible effect of Strain on the critical current (Ic) has been reported for REBa2Cu3O7−δ (REBCO) coated conductors. In this study, the Strain sensitivity of Ic was compared for GdBCO coated conductors with different crystal orientations. Extremely small Strain sensitivity was confirmed from tensile and bending tests at 77 K for a GdBCO film with the [110] direction parallel to the tape length (Gd-F), while a GdBCO film with the [100] or [010] direction parallel to the tape length (Gd-I) has much stronger Strain dependence of Ic. To compare the Strain sensitivity of Ic based on Internal Strain, the lattice Strain was evaluated for a GdBCO film in a composite conductor by employing a diffraction technique using synchrotron radiation. The lattice Strain was determined along both the a- and b-axes for the orthogonal domains that are generated by the twin structure of GdBCO film. A distinct difference in the 2D Strain state that depended on the crystal orientation was revealed for the GdBCO coated conductors. In Gd-I, the lattice Strains along the axial and lateral directions are tensile and compressive under tensile loading, respectively, that is, the 2D Internal Strain state is anisotropic. On the other hand, an almost isotropic 2D Strain state was confirmed in Gd-F. In addition, the Strain components along the crystal axes in Gd-F are much smaller than the axial Strain components in Gd-I. This difference in the Internal Strain state is attributed to the difference in Strain sensitivity between the GdBCO coated conductors with different crystal orientations. The contributions of the Strain components along the a- and b-axes to Ic are discussed on the basis of the measured Strain sensitivities and Internal Strains for two conductors.
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Internal Strain measurement for Nb3Sn wires using synchrotron radiation
Superconductor Science and Technology, 2012Co-Authors: Hidetoshi Oguro, Shutaro Machiya, Satoshi Awaji, Michinaka Sugano, Masugu Sato, Kazuo Watanabe, Takahisa Shobu, Tomoyuki Koganezawa, Kozo OsamuraAbstract:The Internal Strain of the practical Nb3Sn wires under tensile Strain were measured by synchrotron radiation. The x-ray energy of 72 keV was selected to obtain the diffraction from the Nb3Sn in the composite wire. The axial and lateral Strains of the as-reacted and prebent wire were investigated. The Nb3Sn 321 and 320 diffraction peaks were measured to obtain accurate Strain data because of their high intensity. It was found that the relationship between Internal and external Strain under the tensile Strain is slightly different. The Strain of the Nb3Sn 321 plane reveals the similar total Strain applied to the Nb3Sn wire. The ratio of lateral/axial Strain for the as-reacted and prebent wires is 0.34 and 0.30, respectively.
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The direct evaluation of the Internal Strain of biaxially textured YBCO film in a coated conductor using synchrotron radiation
Superconductor Science and Technology, 2008Co-Authors: Michinaka Sugano, Shutaro Machiya, Kozo Osamura, Hiroki Adachi, Masugu Sato, R. Semerad, W. PrusseitAbstract:The Internal Strain state of the superconducting film in a coated conductor should be clarified to understand the Strain effect on the critical current (Ic). We have developed an in situ Strain measurement technique using synchrotron radiation for YBa2Cu3O7−δ (YBCO) coated conductor, and the Internal Strain of the YBCO film was directly evaluated. YBCO powder obtained from the film in the coated conductor was used as a reference of the zero-Strain state. Shifts of the Bragg peaks of the (020) plane of the YBCO film were measured under applied tensile Strain, and the Internal Strain was calculated from the change in the interplanar spacing. The residual Strain of the YBCO film in this coated conductor at room temperature (RT) was directly determined to be −0.061%. The fracture Strain of the YBCO film was also evaluated from the relationship between the applied Strain and the Internal Strain of YBCO. Surface observation of the coated conductor suggests that fracture initiates in the MgO buffer layer. The irreversible Strain (eirr) determined by Ic–Strain characteristics at 77 K was compared with the result from in situ Strain measurement. The validity of our technique using synchrotron radiation is discussed.
Masugu Sato - One of the best experts on this subject based on the ideXlab platform.
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The effect of the 2D Internal Strain state on the critical current in GdBCO coated conductors
Superconductor Science and Technology, 2012Co-Authors: Michinaka Sugano, Shutaro Machiya, Hidetoshi Oguro, Masugu Sato, Tomoyuki Koganezawa, Tomonori Watanabe, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya, Teruo IzumiAbstract:A reversible effect of Strain on the critical current (Ic) has been reported for REBa2Cu3O7−δ (REBCO) coated conductors. In this study, the Strain sensitivity of Ic was compared for GdBCO coated conductors with different crystal orientations. Extremely small Strain sensitivity was confirmed from tensile and bending tests at 77 K for a GdBCO film with the [110] direction parallel to the tape length (Gd-F), while a GdBCO film with the [100] or [010] direction parallel to the tape length (Gd-I) has much stronger Strain dependence of Ic. To compare the Strain sensitivity of Ic based on Internal Strain, the lattice Strain was evaluated for a GdBCO film in a composite conductor by employing a diffraction technique using synchrotron radiation. The lattice Strain was determined along both the a- and b-axes for the orthogonal domains that are generated by the twin structure of GdBCO film. A distinct difference in the 2D Strain state that depended on the crystal orientation was revealed for the GdBCO coated conductors. In Gd-I, the lattice Strains along the axial and lateral directions are tensile and compressive under tensile loading, respectively, that is, the 2D Internal Strain state is anisotropic. On the other hand, an almost isotropic 2D Strain state was confirmed in Gd-F. In addition, the Strain components along the crystal axes in Gd-F are much smaller than the axial Strain components in Gd-I. This difference in the Internal Strain state is attributed to the difference in Strain sensitivity between the GdBCO coated conductors with different crystal orientations. The contributions of the Strain components along the a- and b-axes to Ic are discussed on the basis of the measured Strain sensitivities and Internal Strains for two conductors.
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Internal Strain measurement for Nb3Sn wires using synchrotron radiation
Superconductor Science and Technology, 2012Co-Authors: Hidetoshi Oguro, Shutaro Machiya, Satoshi Awaji, Michinaka Sugano, Masugu Sato, Kazuo Watanabe, Takahisa Shobu, Tomoyuki Koganezawa, Kozo OsamuraAbstract:The Internal Strain of the practical Nb3Sn wires under tensile Strain were measured by synchrotron radiation. The x-ray energy of 72 keV was selected to obtain the diffraction from the Nb3Sn in the composite wire. The axial and lateral Strains of the as-reacted and prebent wire were investigated. The Nb3Sn 321 and 320 diffraction peaks were measured to obtain accurate Strain data because of their high intensity. It was found that the relationship between Internal and external Strain under the tensile Strain is slightly different. The Strain of the Nb3Sn 321 plane reveals the similar total Strain applied to the Nb3Sn wire. The ratio of lateral/axial Strain for the as-reacted and prebent wires is 0.34 and 0.30, respectively.
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The direct evaluation of the Internal Strain of biaxially textured YBCO film in a coated conductor using synchrotron radiation
Superconductor Science and Technology, 2008Co-Authors: Michinaka Sugano, Shutaro Machiya, Kozo Osamura, Hiroki Adachi, Masugu Sato, R. Semerad, W. PrusseitAbstract:The Internal Strain state of the superconducting film in a coated conductor should be clarified to understand the Strain effect on the critical current (Ic). We have developed an in situ Strain measurement technique using synchrotron radiation for YBa2Cu3O7−δ (YBCO) coated conductor, and the Internal Strain of the YBCO film was directly evaluated. YBCO powder obtained from the film in the coated conductor was used as a reference of the zero-Strain state. Shifts of the Bragg peaks of the (020) plane of the YBCO film were measured under applied tensile Strain, and the Internal Strain was calculated from the change in the interplanar spacing. The residual Strain of the YBCO film in this coated conductor at room temperature (RT) was directly determined to be −0.061%. The fracture Strain of the YBCO film was also evaluated from the relationship between the applied Strain and the Internal Strain of YBCO. Surface observation of the coated conductor suggests that fracture initiates in the MgO buffer layer. The irreversible Strain (eirr) determined by Ic–Strain characteristics at 77 K was compared with the result from in situ Strain measurement. The validity of our technique using synchrotron radiation is discussed.
W. Prusseit - One of the best experts on this subject based on the ideXlab platform.
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The direct evaluation of the Internal Strain of biaxially textured YBCO film in a coated conductor using synchrotron radiation
Superconductor Science and Technology, 2008Co-Authors: Michinaka Sugano, Shutaro Machiya, Kozo Osamura, Hiroki Adachi, Masugu Sato, R. Semerad, W. PrusseitAbstract:The Internal Strain state of the superconducting film in a coated conductor should be clarified to understand the Strain effect on the critical current (Ic). We have developed an in situ Strain measurement technique using synchrotron radiation for YBa2Cu3O7−δ (YBCO) coated conductor, and the Internal Strain of the YBCO film was directly evaluated. YBCO powder obtained from the film in the coated conductor was used as a reference of the zero-Strain state. Shifts of the Bragg peaks of the (020) plane of the YBCO film were measured under applied tensile Strain, and the Internal Strain was calculated from the change in the interplanar spacing. The residual Strain of the YBCO film in this coated conductor at room temperature (RT) was directly determined to be −0.061%. The fracture Strain of the YBCO film was also evaluated from the relationship between the applied Strain and the Internal Strain of YBCO. Surface observation of the coated conductor suggests that fracture initiates in the MgO buffer layer. The irreversible Strain (eirr) determined by Ic–Strain characteristics at 77 K was compared with the result from in situ Strain measurement. The validity of our technique using synchrotron radiation is discussed.
Kozo Osamura - One of the best experts on this subject based on the ideXlab platform.
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Internal Strain measurement for Nb3Sn wires using synchrotron radiation
Superconductor Science and Technology, 2012Co-Authors: Hidetoshi Oguro, Shutaro Machiya, Satoshi Awaji, Michinaka Sugano, Masugu Sato, Kazuo Watanabe, Takahisa Shobu, Tomoyuki Koganezawa, Kozo OsamuraAbstract:The Internal Strain of the practical Nb3Sn wires under tensile Strain were measured by synchrotron radiation. The x-ray energy of 72 keV was selected to obtain the diffraction from the Nb3Sn in the composite wire. The axial and lateral Strains of the as-reacted and prebent wire were investigated. The Nb3Sn 321 and 320 diffraction peaks were measured to obtain accurate Strain data because of their high intensity. It was found that the relationship between Internal and external Strain under the tensile Strain is slightly different. The Strain of the Nb3Sn 321 plane reveals the similar total Strain applied to the Nb3Sn wire. The ratio of lateral/axial Strain for the as-reacted and prebent wires is 0.34 and 0.30, respectively.
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Internal Strain and mechanical properties at low temperatures of surround Cu stabilized YBCO coated conductor
IEEE Transactions on Applied Superconductivity, 2010Co-Authors: Kozo Osamura, Shutaro Machiya, Yoshihiro Tsuchiya, Hiroshi SuzukiAbstract:The mechanical properties of surround Cu stabilized YBCO coated conductor were assessed at 5.7, 77 and 298 K. The Internal Strain exerted on the superconducting YBCO layer was directly evaluated under tensile load at low temperatures down to 9.8 K by neutron diffraction techniques. The compressive Internal Strain, present in the YBCO layer without external load, is the thermally induced residual Strain. When the external tensile load was applied, the compressive component of Internal Strain decreased and changed into tensile. The force-free Strain, Aff, was determined as the Strain at which the Internal Strain becomes zero. The estimated from (200) diffraction data depended weakly on temperatures between 298 and 9.8 K. However, the estimated from (020) data decreased prominently with decreasing temperature.
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The direct evaluation of the Internal Strain of biaxially textured YBCO film in a coated conductor using synchrotron radiation
Superconductor Science and Technology, 2008Co-Authors: Michinaka Sugano, Shutaro Machiya, Kozo Osamura, Hiroki Adachi, Masugu Sato, R. Semerad, W. PrusseitAbstract:The Internal Strain state of the superconducting film in a coated conductor should be clarified to understand the Strain effect on the critical current (Ic). We have developed an in situ Strain measurement technique using synchrotron radiation for YBa2Cu3O7−δ (YBCO) coated conductor, and the Internal Strain of the YBCO film was directly evaluated. YBCO powder obtained from the film in the coated conductor was used as a reference of the zero-Strain state. Shifts of the Bragg peaks of the (020) plane of the YBCO film were measured under applied tensile Strain, and the Internal Strain was calculated from the change in the interplanar spacing. The residual Strain of the YBCO film in this coated conductor at room temperature (RT) was directly determined to be −0.061%. The fracture Strain of the YBCO film was also evaluated from the relationship between the applied Strain and the Internal Strain of YBCO. Surface observation of the coated conductor suggests that fracture initiates in the MgO buffer layer. The irreversible Strain (eirr) determined by Ic–Strain characteristics at 77 K was compared with the result from in situ Strain measurement. The validity of our technique using synchrotron radiation is discussed.
Shutaro Machiya - One of the best experts on this subject based on the ideXlab platform.
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Internal Strain measurement for Nb3Sn wires using synchrotron radiation
Superconductor Science and Technology, 2012Co-Authors: Hidetoshi Oguro, Shutaro Machiya, Satoshi Awaji, Michinaka Sugano, Masugu Sato, Kazuo Watanabe, Takahisa Shobu, Tomoyuki Koganezawa, Kozo OsamuraAbstract:The Internal Strain of the practical Nb3Sn wires under tensile Strain were measured by synchrotron radiation. The x-ray energy of 72 keV was selected to obtain the diffraction from the Nb3Sn in the composite wire. The axial and lateral Strains of the as-reacted and prebent wire were investigated. The Nb3Sn 321 and 320 diffraction peaks were measured to obtain accurate Strain data because of their high intensity. It was found that the relationship between Internal and external Strain under the tensile Strain is slightly different. The Strain of the Nb3Sn 321 plane reveals the similar total Strain applied to the Nb3Sn wire. The ratio of lateral/axial Strain for the as-reacted and prebent wires is 0.34 and 0.30, respectively.
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The effect of the 2D Internal Strain state on the critical current in GdBCO coated conductors
Superconductor Science and Technology, 2012Co-Authors: Michinaka Sugano, Shutaro Machiya, Hidetoshi Oguro, Masugu Sato, Tomoyuki Koganezawa, Tomonori Watanabe, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya, Teruo IzumiAbstract:A reversible effect of Strain on the critical current (Ic) has been reported for REBa2Cu3O7−δ (REBCO) coated conductors. In this study, the Strain sensitivity of Ic was compared for GdBCO coated conductors with different crystal orientations. Extremely small Strain sensitivity was confirmed from tensile and bending tests at 77 K for a GdBCO film with the [110] direction parallel to the tape length (Gd-F), while a GdBCO film with the [100] or [010] direction parallel to the tape length (Gd-I) has much stronger Strain dependence of Ic. To compare the Strain sensitivity of Ic based on Internal Strain, the lattice Strain was evaluated for a GdBCO film in a composite conductor by employing a diffraction technique using synchrotron radiation. The lattice Strain was determined along both the a- and b-axes for the orthogonal domains that are generated by the twin structure of GdBCO film. A distinct difference in the 2D Strain state that depended on the crystal orientation was revealed for the GdBCO coated conductors. In Gd-I, the lattice Strains along the axial and lateral directions are tensile and compressive under tensile loading, respectively, that is, the 2D Internal Strain state is anisotropic. On the other hand, an almost isotropic 2D Strain state was confirmed in Gd-F. In addition, the Strain components along the crystal axes in Gd-F are much smaller than the axial Strain components in Gd-I. This difference in the Internal Strain state is attributed to the difference in Strain sensitivity between the GdBCO coated conductors with different crystal orientations. The contributions of the Strain components along the a- and b-axes to Ic are discussed on the basis of the measured Strain sensitivities and Internal Strains for two conductors.
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Internal Strain and mechanical properties at low temperatures of surround Cu stabilized YBCO coated conductor
IEEE Transactions on Applied Superconductivity, 2010Co-Authors: Kozo Osamura, Shutaro Machiya, Yoshihiro Tsuchiya, Hiroshi SuzukiAbstract:The mechanical properties of surround Cu stabilized YBCO coated conductor were assessed at 5.7, 77 and 298 K. The Internal Strain exerted on the superconducting YBCO layer was directly evaluated under tensile load at low temperatures down to 9.8 K by neutron diffraction techniques. The compressive Internal Strain, present in the YBCO layer without external load, is the thermally induced residual Strain. When the external tensile load was applied, the compressive component of Internal Strain decreased and changed into tensile. The force-free Strain, Aff, was determined as the Strain at which the Internal Strain becomes zero. The estimated from (200) diffraction data depended weakly on temperatures between 298 and 9.8 K. However, the estimated from (020) data decreased prominently with decreasing temperature.
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The direct evaluation of the Internal Strain of biaxially textured YBCO film in a coated conductor using synchrotron radiation
Superconductor Science and Technology, 2008Co-Authors: Michinaka Sugano, Shutaro Machiya, Kozo Osamura, Hiroki Adachi, Masugu Sato, R. Semerad, W. PrusseitAbstract:The Internal Strain state of the superconducting film in a coated conductor should be clarified to understand the Strain effect on the critical current (Ic). We have developed an in situ Strain measurement technique using synchrotron radiation for YBa2Cu3O7−δ (YBCO) coated conductor, and the Internal Strain of the YBCO film was directly evaluated. YBCO powder obtained from the film in the coated conductor was used as a reference of the zero-Strain state. Shifts of the Bragg peaks of the (020) plane of the YBCO film were measured under applied tensile Strain, and the Internal Strain was calculated from the change in the interplanar spacing. The residual Strain of the YBCO film in this coated conductor at room temperature (RT) was directly determined to be −0.061%. The fracture Strain of the YBCO film was also evaluated from the relationship between the applied Strain and the Internal Strain of YBCO. Surface observation of the coated conductor suggests that fracture initiates in the MgO buffer layer. The irreversible Strain (eirr) determined by Ic–Strain characteristics at 77 K was compared with the result from in situ Strain measurement. The validity of our technique using synchrotron radiation is discussed.