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2006 Fiscal Year Final Research Report Summary

Mechanism of change in superconducting properties of superconducting materials by 14 MeV neutron irradiation

Research Project

Project/Area Number 16560725
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

NISHIMURA Arata  National Institute for Fusion Science, Fusion Engineering Research Center, Professor, 炉工学研究センター, 教授 (60156099)

Co-Investigator(Kenkyū-buntansha) SEO Kazutaka  National Institute for Fusion Science, Fusion Engineering Research Center, Research Associate, 炉工学研究センター, 助手 (70370137)
HISHINUMA Yoshimitsu  National Institute for Fusion Science, Fusion Engineering Research Center, Research Associate, 炉工学研究センター, 助手 (00322529)
TAKEUCHI Takao  National Institute for Materials Science, Superconducting Materials Center, Group Leader, 超伝導材料センター, グループリーダー (80354299)
Project Period (FY) 2004 – 2006
Keywords14 MeV neutron / Nb_3Al wire / Nb_3Sn wire / Superconducting wire / Cryogenic irradiation / Critical temperature / Irradiation damage / Knock on effect
Research Abstract

1. Some investigations reported that a certain amount of fast neutron would come out through shielding blankets and reach superconducting magnets in International Thermo-nuclear Experimental Reactor. To research the mechanism of change in superconducting properties of superconducting wires, a new system for 14 MeV neutron irradiation at cryogenic temperatures was designed and installed. It was confirmed that the system worked well.
2. To measure the temperature precisely, the performance of PtCo resistive sensor, Au/Fe-Chromel thermo-couple and Cernox resistive sensor was investigated during and after the irradiation of 14 MeV neutron. As the results, Cernox sensor showed good performance and no clear degradation was observed as far as the test was carried out.
3. After the irradiation of 10^<20> n/m^2 14 MeV neutron, Nb_3Sn wire did not show any change in the critical temperature. However, a Nb_3Al wire which was heat treated by a rapid heating and quenching (RHQ) showed remarkable degradation of the critical temperature, although the Nb_3Al wire which was annealed at 800 degree in C for 10 hours after RHQ treatment did not show such change.
4. The critical temperature has strong relation with long range ordering (LRO) of the A15 crystalline. So, it was considered that the degradation of the critical temperature was caused by the disturbance of the LRO. The fast neutron hits the atom in A15 crystalline and kicks it out. The kicked out atom hits another atom and one vacancy remains after the knocking out. This knock on effect will disturb the ordering of the atom constituting the A15 crystalline, resulting in the worse change in the critical temperature.

  • Research Products

    (10 results)

All 2007 2006 2005

All Journal Article (10 results)

  • [Journal Article] Change in Properties of Superconducting Magnet Materials by Fusion Neutron Irradiation2007

    • Author(s)
      西村新, 西嶋茂宏, 竹内孝夫, 西谷健夫
    • Journal Title

      Fusion Engineering and Design

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Change in Properties of Superconducting Magnet Materials by Fusion Neutron Irradiation2007

    • Author(s)
      A.Nishimura, S.Nishijima, T.Takeuchi, T.Nishitani
    • Journal Title

      Fusion Engineering and Design

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Nuclear technology and potential ripple effect of superconducting magnets for fusion power plant2006

    • Author(s)
      西村新, 室賀健夫, 竹内孝夫, 西谷健夫, 森岡篤彦
    • Journal Title

      Fusion Engineering and Design 81

      Pages: 1675-1681

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 14MeV Neutron Irradiation Effect on Superconducting Magnet Materials for Fusion Device2006

    • Author(s)
      西村新, 菱沼良光, 妹尾和威, 田中照也, 室賀健夫, 他7名
    • Journal Title

      Advances in Cryogenic Engineering 52

      Pages: 208-215

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Irradiation Effect of 14MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics2006

    • Author(s)
      西村新, 菱沼良光, 妹尾和威, 田中照也, 室賀健夫, 他7名
    • Journal Title

      Advances in Cryogenic Engineering 52

      Pages: 241-248

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Nuclear Technology and Potential Ripple Effect of Superconducting Magnets for Fusion Power Plant2006

    • Author(s)
      A.Nishimura, T.Muroga, T.Takeuchi, T.Nishitani, A.Morioka
    • Journal Title

      Fusion Engineering and Design Vol. 81

      Pages: 1675-1681

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 14 MeV Neutron Irradiation Effect on Superconducting Magnet Materials for Fusion Device2006

    • Author(s)
      A.Nishimura, Y.Hishinuma, K.Seo, T.Tanaka, T.Muroga, S.Nishijima, K.Katagiri, T.Takeuchi, Y.Shindo, K.Ochiai, T.Nishitani, K.Okuno
    • Journal Title

      Advances in Cryogenic Engineering Vol. 52

      Pages: 208-215

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics2006

    • Author(s)
      A.Nishimura, Y.Hishinuma, K.Seo, T.Tanaka, T.Muroga, S.Nishijima, K.Katagiri, T.Takeuchi, Y.Shindo, K.Ochiai, T.Nishitani, K.Okuno
    • Journal Title

      Advances in Cryogenic Engineering Vol. 52

      Pages: 241-248

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Design, Fabrication and Installation of Cryogenic Target System for 14MeV Neutron Irradiation2005

    • Author(s)
      西村新, 菱沼良光, 田中照也, 室賀健夫, 西嶋茂宏, 他5名
    • Journal Title

      Fusion Engineering and Design 75-79

      Pages: 173-177

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Design, Fabrication and Installation of Cryogenic Target System for 14 MeV Neutron Irradiation2005

    • Author(s)
      A.Nishimura, Y.Hishinuma, T.Tanaka, T.Muroga, S.Nishijima, Y.Shindo, T.Takeuchi, K.Ochiai, T.Nishitani, K.Okuno
    • Journal Title

      Fusion Engineering and Design Vol. 75-79

      Pages: 173-177

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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