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RESEARCH ON CASCADE OVELAPPING EFFECTS BY COMBINED IRRADIATION EXPERIMENTS

Research Project

Project/Area Number 08458118
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般・原子力学
Research InstitutionTHE UNIVERSITY of TOKYO

Principal Investigator

SEKIMURA Naoto  THE UNIVERSITY OF TOKYO,SCHOOL OF ENGINEERING,ASSOCIATE PROFESSOR, 工学系研究科, 助教授 (10183055)

Co-Investigator(Kenkyū-buntansha) IWATA Shuichi  THE UNIVERSITY OF TOKYO,RESEARCH INTO ARTIFACT CENTER,PROFESSOR, 人工物工学研究センター, 教授 (50124665)
ISHINO Shiori  TOKAI UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (70010733)
KAWANISHI Hiroshi  The UNIVERSITY OF TOKYO,SCHOOL OF ENGINEERING,RESEARCH ASSOCIATE, 工学系研究科, 助手 (40010970)
IWAI Takeo  THE UNIVERSITY OF TOKYO,RESEARCH CENTER FOR NUCLEAR SCI., RESEARCH ASSOCIATE, 原子力研究総合センター, 助手 (30272529)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥6,500,000 (Direct Cost: ¥6,500,000)
KeywordsCOMBINED IRRADIATION / MATERIALS MODELING / NEUTRON IRRADIATION / ION IRRADIATION / CASCADE DAMAGE / DEFECT CLUSTERS / 照射損傷 / 金薄膜
Research Abstract

Combined irradiation experiments are designed to obtain required information for modeling of materials behavior. Combined irradiation experiments contains neutron irradiation of irradiated materials under different conditions with neutrons, ions or electron, and also charged particle irradiation of irradiated materials with neutrons.
In thin foils of gold irradiated with fast neutrons, density of vacancy clusters increases linearly with dose and then shows super-linear increase. Cascade damage can be divided into several sub-cascades, and observed clusters form group of clusters. Distributions of number of clusters in a group is found to increase with dose. This can be attributed to the overlapping of cascades which cause the formation of new small defect clusters near the existing group of cluster. This phenomena is also found to be dependent on the primary knock-on atom (PKA) energy, comparing fission and fusion neutron irradiation results. To confirm this PKA energy dependence, self-ions with several energies are irradiated to thin foils of gold followed by fast neutron irradiation. From these combined irradiation experiments, following new results are obtained ; 1) invisible defect clusters are created by cascade damage in addition to visible defect cluster. 2) Invisible defect clusters are converted to visible defect clusters by overlap of cascades and this critical interaction length is estimated as a function of PKA energy. 3) The efficiency of formation of invisible clusters and their conversion to visible clusters is also quantitatively estimated.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] K.Morishita,N.Sekimura and T.Diaz de la Rubia: "A Molecular Dynamics Study for Ultrafast Process of Radiation Damage in Materials" Journal of Nuclear Materials. 248. 400-408 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura,Y.Shirao and K.Morishita: "Defect Cluster Formation in Vanadium under Heavy Ion Irradiation" Proceedings of the 4th Japan-China Symposium on Materials for Advanced Energy Systems. 233 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Muroga and N.Sekimura: "New Insights into Temperature Effects on Neutron Irradiation of Structural Materials" to be published in Fusion Engineering and Design. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura,Y.Shirao,H.Yamaguchi: "Defect Cluster Formation in Vanadium Irradiated with Heavy Ions" to be published in Journal of Nuclear Materials. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura,Y.Kanzaki,N.Ohtake,et al: "High Energy Cascades as Studied by High Energy Self-Ion Irradiation" to be published in Journal of Nuclear Materials. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Iwai,N.Sekimura and F.A.Garner,: "Effects of Helium on Large Void Swelling in V-5Fe" to be published in Journal of Nuclear Materials. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura and T.Diaz de la Rubia: "A Molecular Dynamics Study for Ultrafast Process of Radiation Damage in Materials" Journal of Nuclear Materials. 248. 400-408 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura, Y.Shiraoand K.Morishita: "Defect Cluster Formation in Vanadium under Heavy Ion Irradiation" Proc.of the 4th Japan-China Symposium on Materials for Advanced Energy Systems and Fission and Fusion Eng.96. 233 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Muroga and N.Sekimura: "New Insights into Temperature Effects on Neutron Irradiation of Structural Materials" Fusion Engineering and Design. (to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura, Y.Shirao, H.Yamaguchi, S.Yonamine and Y.Arai: "Defect Cluster Formation in Vanadium Irradiated with Heavy Ions" Journal of Nuclear Materials. (to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura, Y.Kanzaki, N.Ohtake, et al: "High Energy Cascades as Studied by High Energy Self-Ion Irradiation" Journal of Nuclear Materials. (to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Iwai, N.Sekimura and F.A.Garner: "Effects of Helium on Large Void Swelling in V-5Fe" Journal of Nuclear Materials. (to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura: "Influence of Boron-generated Helium on the Swelling of Neutron IrradiatedV,V-5Cr and V-5Fe" Journal of Nuclear Materials. 233-237. 400-405 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Sekimura: "Primary Knock-on Atom Energy Dependence of Cascade Damage Formation and Interaction" Journal of Nuclear Materials. 233-237. 1080-1084 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Morishita, N.Sekimura and T.Diaz de la Rubia: "A Molecular Dynamics Study for Ultrafast Process of Radiation Damage in Materials" Journal of Nuclear Materials. 248. 400-408 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Sekimura, Y.Shirao and K.Morishita: "Defect Cluster Formation in Vanadium under Heavy Ion Irradiation" Proceedings of the 4th Japan-China Symposium on Materials for Advanced Energy Systems. 233 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Muroga and N.Sekimura: "New Insights into Temperature Effects on Neutron Irradiation of Structural Materials" to be published in Fusion Engineering and Design. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Sekimura, Y.Shirao, H.Yamaguchi: "Defect Cluster Formation in Vanadium Irradiated with Heavy Ions" to be published in Journal of Nuclear Materials. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Sekimura, Y.Kanzaki, N.Ohtake, et al: "High Energy Cascades as Studied by High Energy Self-Ion Irradiation" to be published in Journal of Nuclear Materials. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Iwai, N.Sekimura and F.A.Garner,: "Effects of Helium on Large Void Swelling in V-5Fe" to be published in Journal of Nuclear Materials. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] E.A.Koptelov: "On Density Effects in Point Defect Solutions under Irradiation,I.Qualitative Consideration of Quasai-equilibrium States" Journal of Nuclear Materials. 232. 87-97 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] E.A.Koptelov: "On Density Effects in Point Defect Solutions under Irradiation,II.Formation of Interstitial Dislocation Loops" Journal of Nuclear Materials. 232. 98-112 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Sekimura: "Influence of Boron-generated Helium on the Swelling of Neutron Irradiated V,V-5Cr and V-5Fe" Journal of Nuclear Materials. 233-237. 400-405 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] F.A.Garner: "Influence of Flux-Spectra Differences on Transmutation,Dimensional Chagnes and Fracture of Vanadium Alloys" Journal of Nuclear Materials. 233-237. 406-410 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Sekimura: "Primary Knock-on Atom Energy Dependence of Cascade Damage Formation and Interaction" Journal of Nuclear Materials. 233-237. 1080-1084 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Iwai: "Void Swelling Behavior in Ion-irradiated Vanadium Alloys" Journal of Nuclear Materials. (to be published).

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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