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Computer Simulation of Plasma-Surface Interactions in Fusion Devices

Research Project

Project/Area Number 09680494
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionThe University of Tokushima

Principal Investigator

OHYA Kaoru  The University of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (10108855)

Co-Investigator(Kenkyū-buntansha) NISHIMURA Kenji  Numazu College of Technology, Lecturer, 講師 (90249798)
KAWATA Jun  Takuma National College of Technology, Associate Professor, 助教授 (20234073)
HARADA Akio  The University of Tokushima, Research Assistant, 工学部, 助手 (40294722)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsNuclear Fusion / Plasma-Surface Interaction / Computer Simulation / Sputtering / Erosion / Impurity Release / Secondary Electron Emission / Ion Reflection / 計算機シュミレーション / スバッタリング
Research Abstract

A computer simulation code which treats plasma-surface interactions for divertor plates in magnetic confine-went fusion devices. The simulation code allows simultaneous incidence of different ion species as well as a Maxwellian velocity distribution and different charge states of the ions. The dynamic composition change of the surface layer due to ion implantation and redeposition of released impurities due to their ionization and gyromotion in an edge plasma.
Particle release from a W test limiter exposed to deuterium edge plasma, containing impurities C and O, in the tokamak TEXTOR-94 is studied by using this simulation code. The release of W impurities from the limiter is strongly suppressed by prompt redeposition, whereas low Z impurities (C and O) are much less influenced. Expert- mentally observed radial distributions of WI and CII line intensities in front of the limiter can be explained by physical sputtering of W and deposited C, in addition to high-energy reflection of impurit … More y C ions. On the other hand, the CII line emission observed in front of graphite as a limiter is attributed to many low-energy atoms due to chemical sputtering by impact of D ions, which is strongly suppressed by deposition of high-Z impurities, such as W.
Erosion of boron out of a thin film exposed to deuterium edge plasmas and the simultaneous carbon deposition in TEXTOR-94 is studied by simulation. The implantation of carbon impurities strangly changes the effective boron sputtering yield of the film, which results into a lowering of the film erosion and a formation of thick carbon deposits. A strong decrease in the experimentally observed Bill line emission around a surface location far from the plasma edge can be explained by a carbon deposition on the film. The cauculated carbon depth proflies in die film are in resonable agreement with measurements by AES.
A combined Monte Carlo simulation of secondary electron emission from solids and transport of secondary electrons in a plasma sheath is performed for analyzing a relationship between the secondary electron yield and sheath voltage formed on the wall in magnetic fusion devices. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] J.Kawata,K.Nishimura,A.Harada,K.Ohya: "Monte Carlo simulation of secondary electron emission from plasma facing materials" Radiation Effects and Defects in Solids. Vol.142. 149-161 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya,J.Kawata,A.Harada: "Dynamic simulation of sputtering of tungsten irradiated by plasmas in an oblique magnetic field" Radiation Effects and Defects in Solids. Vol.142. 401-413 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tanabe,M.Akiba,Y.Ueda,K.Ohya,M. Wada,V.Philipps: "On the utilization of high Z materials as a plasma facing component" Fusion Engineering and Design. Vol.39-40. 275-285 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya,J.Kawata,T.Tanabe,M.Wada,Y.Ueda,et al.: "Ion reflection and sputtering at tungsten surface exposed to edge plasmas in TEXTOR" Journal of Nuclear Materials. Vol.258-263. 1055-1059 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya,J.Kawata,T.Tanabe,M.Wada,T.Ohgo,et al.: "Particle emission from a tungsten test limiter in TEXTOR-94 : a comparison between experimental and Monte Carlo simulated results" Journal of Nuclear Materials. (in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya,T.Tanabe,M.Wada,T.Ohgo,V.Philipps,et al.: "Simulation and experimental studies of impurity release from tungsten exposed to edge plasmas in TEXTOR-94" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya,J.Kawata,J.Wienhold,P.Karduck,et al.: "Boron erosion and carbon deposition due to simultaneous bombardment with deuterium and carbon ion in plasmas" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Saji,K.Ohya: "Influence of impurity deposition on ion reflection and sputtering from low Z and high Z materials" Bulletin of Faculty of Engineering,The University of Tokushima. No.44. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 大宅 薫: "スパッタリングと2次電子放出" プラズマ・核融合学会誌. Vol.75,No.4. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.Kawata, K.Nishimura, A.Harada, K.Ohya: "Monte Carlo simulation of secondary electron emission from plasma facing materials" Radiation effects and Defects in Solids. Vo1.142. 149-161 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya, J.Kawata, A.Harada: "Dynamic simulation of sputtering of tungsten irradiated by plasmas in an oblique magnetic field" Radiation effects and Defects in Solids. Vo1.142. 401-413 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tanabe, M.Akiba, Y.Ueda, K.Ohya, M.Wada, V.Philipps: "On the utilization of high Z materials as a plasma facing component" Fusion Engineering and Design. Vo1.39-40. 275-285 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya, J.Kawata, T.Tanbe, M.Wada, Y.Ueda, et al.: "Ion reflection and sputtering at tungsten surface exposed to edge plasmas in TEXTOR" Journal of Nuclear Materials. Vo1.258-263. 1055-1059 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya, J.Kawata, T.Tanabe, M.Wada, T.Ohgo, et al.: "Particle emission from a tungsten test limiter in TEXTOR-94 : a comparison between experimental and Monte Carlo simulated results" Journal of Nuclear Materials. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya, T.Tanabe, M.Wada, T.Ohgo, V.Philipps, et al.: "Simulation and experimental studies of impurity release from tungsten exposed to edge plasmas in TEXTOR-94" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya, J.Kawata, P.Wienhold, P.Karduck, et al.: "Boron erosion and carbon deposition due to simultaneous bombardment with deuterimu and carbon ions in plasmas" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya: "Secondary electron emission from plasma facing materials and its impact on sheath potential" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Saji, K.Ohya: "Influence of impurity deposition on ion reflection and sputtering from low Z and high Z materials" Bulletin of Faculty of Engineering, The University of Tokushima. No.44, (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya: "Physical sputtering and secondary electron emission" Journal of Plasma and Fusion Reserch. Vo1.75, No.4, (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Ohya,J.Kawata,T.Tanabe,M.Wada,Y.Ueda,et al.: "Ion reflection and sputtering at tungsten surface exposed to edge plasmas in TEXTOR" Journal of Nuclear Materials. Vol.258-263. 1055-1059 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ohya,J.Kawata,T.Tanabe,M.Wada,T.Ohgo,et al.: "Particle emission from atungsten test limiter in TEXTOR-94:a comparison between experimental and Monte Carlo simulated results." Journal of Nuclear Materials. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ohya,T.Tanabe,M.Wada,T.Ohgo,V.Philipps,et al.: "Simulation and experimental studies of impurity release from tungsten exposed to edge plasmas in TEXTOR-94" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ohya,J.Kawata,J.Wienhold,P.Karduck,et al.: "Boron erosion and carbon deposition due to simultaneous bombardment with deuterium and carbon ion in plasmas" Nuclear Instruments and Methods in Physics Research B. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ohya: "Secondary electron emission from plasma facing materials and its imapact on sheath potential" Nuclear Instrumentsand Methods inPhysics Research B. (in press). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Saji,K.Ohya: "Influence of impurity depsition onion reflection and sputtering from low Zand high Zmaterials" Bulletin of Faculty of Engineering,The University of Tokushima. No.44. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Ohya, J.Kawata, A.Harada: "Dynamic Simulation of Sputtering of Tungsten Irradiated by Plasmas in an Oblique Magnetic Field" Radiation Effects and Defects in Solids. Vol.142. 401-413 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] J.Kawata, K.Nishimura A.Harada, K.Ohya: "Monte Carlo Simulation of Secondary Electron Emission from Plasma Facing Materials" Radiation Effects and Defects in Solids. Vol.142. 149-161 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Ohya, J.Kawata, T.Tanabe, M,Wada et al.: "Ion Reflectin and Sputering at Tungsten Surface Exposed to Edge Plasmas in TEXTOR" Journal of Nuclear Materials. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Tanabe, M,Akiba, Y.Ueda, K.Ohya et al.: "On the Utilization of High Z Materials as Plasma Facing Materials" Journal of Nuclear Materials. (in press). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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