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1995 Fiscal Year Final Research Report Summary

Novel First-Wall Conditioning in Stationary Reactor Studies

Research Project

Project/Area Number 06452419
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionNagoya University

Principal Investigator

SUGAI Hideo  Nagoya University, Faculty of Engineering, Professor, 工学部, 教授 (40005517)

Co-Investigator(Kenkyū-buntansha) SASAKI Kohichi  Nagoya University, Faculty of Engineering, Assistant Professor, 工学部, 助手 (50235248)
NAKAMURA Keiji  Nagoya University, Faculty of Engineering, Assistant Professor, 工学部, 助手 (20227888)
TOYODA Hirotaka  Nagoya University, Faculty of Engineering, Associate Professor, 工学部, 講師 (70207653)
Project Period (FY) 1994 – 1995
Keywordsfirst wall conditioning / boron coating / rithium coating / hydrogen recycling / oxygen gettering / impurity control / decaborane / ECR plasma
Research Abstract

Studies on stationary rectors with use of superconducting magnets have recently become more important. In this situation, conventional dc glow plasmas under no magnetic field is useless and, instead of them, magnetized plasmas such as ECR microwave plasmas have to be used. Furthemore, such techniques as lithium pellet injection will be promising for in situ wall conditioning without interrupting fusion plasmas. Most of this study was devoted to lithium coating and ECR-based boronization as follows :
(1) Boron coating
Two methods for new boronization in stationary reactors were proposed. One is injection of decaborane pellet injection and the other is boronization based on ECR microwave discharge under magnetic field. The basic experiment of ECR boronization showed a neutral radical deposition localized near the gas inlet and wider deposition of ionic radicals transported along magnetic lines of force, thus making a large vessel coating possible.
(3) Lithium coating
It was found for the first time that a lithium layr has a storong gettering effect on various molecules such as O_2, H_2O,CO and CH_4 while it absorbs a hydrogen atom per a lithium atom. Moreover, studies on the temperature dependence of hydrogen desorption and on hydrogen state in lithium layr. In future, lithium pellet injection could be a powerful tool of conditioning walls without interrupting a fusion plasma.

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] M.Yamage and H.Sugai: "A New Approach to Boronization of Fusion Devices" Japanese Journal of Applied Physics. Series 10. 184-187 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sugai 他2名: "Electrostatic Coupling of Antenna and the Shielding Effect in Inductive rf Plasma" Japanese Journal of Applied Physics. 33. 2189-2193 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Goto 他3名: "Cross Section Measurements for Electron-Impact Dissociation of CHF3 into Neutral and Ionic Radicals" Japanese Journal of Applied Physics. 33. 3602-3607 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sugai 他7名: "Wall Conditioning with Lithium Evaporation" Journal of Nuclear Materials. 220-222. 254-258 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yamage 他10名: "Hydrogen Content and Isotope Exchange in Boronization" Journal of Nuclear Materials. 220-222. 743-747 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Noda 他16名: "Boronization Study for Application to Large Helical Device" Journal of Nuclear Materials. 220-222. 623-626 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kondo 他8名: "Impurity Behavior in Heliotron E" Journal of Nuclear Materials. 220-222. 1052-1056 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ogiwara 他7名: "The Reaction of Energetic O_2^+ Ions with Boron Carbide" Journal of Nuclear Materials. 220-222. 748-751 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Toyoda 他4名: "Simple Direct Monitoring of SiH3 Radical and Particulates in a Silane Plasma with Ultra-Violet Transmission Spectroscopy" Japanese Journal of Applied Physics. 34A. L448-451 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Nakamura 他2名: "Helicon Wave Measurements in an Inductively Coupled Magnetoplasma" Australian Journal of Physics. 48. 461-468 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Nakamura 他2名: "Hot Spots and Electron Heating Processes in a Helicon-Wave Excited Plasma" Japanese Journal of Applied Physics. 34. 2152-2157 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sugai 他3名: "A Biased Optical Probe Method for Measurements of Electron Energy Distribution in a lasma" Plasma Souces Sci.Technol.4. 366-372 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sugai 他3名: "Diagnostics and Control of Radicals in an Inductively Coupled Etching Reactor" J.Vac.Sci.& Technol.A13. 887-893 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Mitsuoka 他2名: "Observation of Ion Scattering from Metal Surfaces Bombarded with Low-Energy Hydrocarbon Ions" Japanese Journal of Applied Physics. 34B. L516-519 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Mitsuoka 他2名: "Dissociative Ion Yields on Metal Surfaces Bombarded with Low-Energy Fluorocarbon Ions" Japanese Journal of Applied Physics. 34A. L1486-L1489 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yamage and H.Sugai: "A New Approach to Boronization of Fusion Devices" Jpn.J.Appl.Phys.Series 10. 184-187 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sugai, K.Nakamura and K.Suzuki: "Electrostatic Coupling of Antenna and the Shielding Effect in Inductive rf Plasma" Jpn.J.Appl.Phys.33. 2189-2193 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Goto, K.Nakamura, H.Toyoda and H.Sugai: "Cross Section Measurements for Electron-Impact Dissociation of CHF3 into Neutral and Ionic Radicals" Jpn.J.Appl.Phys.33. 3602-3607 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sugai, H.Toyoda, K.Nakamura.K.Furuta, M.Ohori, K.Toi, S.Hirokura and K.Sato: "Wall Conditioning with Lithium Evaporation" J.Nucl.Mater.220-222. 254-258 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamage, H.Sugai, T.Saito.H.Toyoda, M.Saidoh, N.Ogiwara, T.Mizuuchi, F.Sano, K.Kondo, T.Ohbiki and K.Sato: "Hydrogen Content and Isotope Exchange in Boronization" J.Nucl.Mater.220-222. 743-747 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Noda, A.Sagara, H.Yamada, Y.Kubota, N.Inoue, K.Akaishi, O.Motojima, K.Iwamoto, M.Hasha, I.Fujita, T.Hino, T.Yamashina, K.Okazaki, I.Rice, M.Yamage, H.Toyoda, H.Sugai: "Boronization Study for Application to Large Helical Device" J.Nucl.Mater.220-222. 623-626 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kondo, T.Mizuuchi, H.Sugai, M.Yamage et al.: "Impurity Behavior in Heliotron E" J.Nucl.Mater.220-222. 1052-1056 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Ogiwara, R.Jimbou, M.Saidoh, Y.Yamage, H.Sugai, et al.: "The Reaction of Energetic O_2^+ Ions with Boron Carbide" J.Nucl.Mater.220-222. 784-751 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Toyoda, M.Goto, M.Kitagawa, T.Hirao, and H.Sugai: "Simple Direct Monitoring of SiH3 Radical and Particulates in a Silane Plasma with Ultra-Violet Transmission Spectroscopy" Jpn.J.Appl.Phys.34A. L448-451 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Nakamura, K.Suzuki and H.Sugai: "Helicon Wave Measurements in an Inductively Coupled Magnetoplasma" Australian J.Phys.48. 461-468 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Nakamura, K.Suzuki and H.Sugai: "Hot Spots and Electron Heating Processes in a Helicon-Wave Excited Plasma" Jpn.J.Appl.Phys.34. 2152-2157 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sugai, H.Toyoda, K.Nakano and N.Isomura: "A Biased Optical Probe Method for Measurements of Electron Energy distribution in a Plasma" Plasma Souces Sci.Technol.4. 366-372 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sugai, K.Nakamira, Y.Hikosaka and M.Nakamura.: "Diagnostics and Control of Radicals in an Inductively Conpled Etching Reactor" J.Vac.Sci.& Technol.A13. 887-893 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Mitsuoka, H.Toyoda and H.Sugai: "Observation of Ion Scattering from Metal Surfaces, Bombarded with Low-Energy Hydrocarbon Ions" Jpn.J.Appl.Phys.34B. 516-519 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Mitsuoka, H.Toyoda and H.Sugai: "Dissociative Ion Yields on Metal Surfaces Bombarded with Low-Energy Fluorocarbon Ions" Jpn.J.Appl.Phys.34A. L1486-L1489 (1995)

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

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Published: 1997-03-04  

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