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Study on neutral particle behavior in non-axisymmetric minimum-B region of a tandem mirror

Research Project

Project/Area Number 15540467
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Plasma science
Research InstitutionUniversity of Tsukuba

Principal Investigator

NAKASHIMA Yousuke  University of Tsukuba, Graduate School of Pure and Applied Sciences, Associate Professor, 大学院・数理物質科学研究科, 助教授 (00188939)

Co-Investigator(Kenkyū-buntansha) YOSHIKAWA Masayuki  University of Tsukuba, Graduate School of Pure and Applied Sciences, Assistant Professor, 大学院・数理物質科学研究科, 講師 (00272138)
SHOJI Mamoru  University of Tsukuba, National Institute for Fusion Science, National Institutes for Natural Sciences, Research Associate, 核融合科学研究所, 助手 (00280602)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsTandem Mirror / Neutral Hydrogen Atoms and Molecules / H-Alpha Line-emission Measurement / Non-axisymmetric Structure / Monte-Carlo Simulation / DEGAS Code
Research Abstract

The objective of this research is to measure he Hydrogen Balmer-alpha(Hα) line emission from the anchor cell and from the transition region in the anchor minimum-B region. We also performed a neutral transport simulation using a Monte-Carlo code "DEGAS". In this simulation, the density and temperature profiles of hydrogen atoms and molecules are predicted in non-axismmetric anchor mirror cell and hence a important knowledge with particle transport in such complicated configuration of this magnetic structure.
In the last fiscal year, a newly designed two-dimensional Hα detector array was constructed. In order to measure the line emission from the narrow viewing area, the detector was required to obtain a high spatial resolution and its characteristics of the detector were investigated by using a standard lamp. A three-dimensional Monte-Carlo neutral particle simulation code "DEGAS ver.63" was applied to the GAMMA 10 anchor cell for the first time and a simulation study in this region was … More started. A preliminary mesh model was constructed and three-dimensional simulation was carried out. From this simulation, it was found that two particle sources (mirror throat gas puffer and a limiter at the outer transition region of the anchor cell) successfully explain the measured results of Hα line-emission in the anchor cell.
In this fiscal year, the first measurement of detailed structure of the Hα line-emission in the anchor outer-transition region was successfully performed using the above detector array. It was found that the measured Hα line intensity has a strong peak along the miner axis of elliptically elongated plasma cross-section. On the contrary, in an axial direction along the magnetic field line, the spatial profile of the line intensity became flat. In order to explain the obtained results, a new mesh model covering from the anchor cell to the plug/barrier cell was constructed and detailed simulation based on the realistic structure of these cells was performed. The simulation results considering a particle source from the limiter at this region showed a good agreement with the measured profiles. A unified mesh mode covering from the central-cell to the anchor-cell was successfully built up, which enabled to precisely simulate the neutral transport in the connecting region between the two cells efficiently. From the above results, the three-dimensional structure of plasma and vacuum chamber wall plays an important roll in neutral transport in this region. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (24 results)

All 2005 2004 Other

All Journal Article (19 results) Publications (5 results)

  • [Journal Article] Neutral Beam Injection Experiments and Related Behavior of Neutral Particles in the GAMMA 10 Tandem Mirror2005

    • Author(s)
      Y.Nakashima, et al.
    • Journal Title

      Transaction of Fusion Technology 47 No.1T

      Pages: 155-158

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Analysis of Neutral Transport in the GAMMA 10 Anchor-Cell Using Hα-Emission Detectors2005

    • Author(s)
      Y.Higashizono, Y.Nakashima, et al.
    • Journal Title

      Transaction of Fusion Technology 47 No.1T

      Pages: 297-299

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Modeling of three-dimensional neutral transport in the tandem mirror plasmas using a Monte-Carlo code2005

    • Author(s)
      Y.Nakashima, et al.
    • Journal Title

      Journal of Nuclear Materials 337-339

      Pages: 461-470

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Neutral Beam Injection Experiments and Related Behavior of Neutral Particles in the GAMMA 10 Tandem Mirror2005

    • Author(s)
      Y.Nakashima,.et al.
    • Journal Title

      Transaction of Fusion Technology 47 No.1T

      Pages: 155-158

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Modeling of three-dimensional neutral transport in the tandem mirror plasmas using a Monte-Carlo code2005

    • Author(s)
      Y.Nakashima,.et al.
    • Journal Title

      J.Nucl.Mater. 337-339

      Pages: 461-470

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Neutral transport analysis in non-axisymmetric anchor region of the GAMMA 10 tandem mirror using a Monte-Carlo simulation2005

    • Author(s)
      Y.Nakashima, et al.
    • Journal Title

      Journal of Plasma and Fusion Research, SERIES 6(印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Diagnostic system of Hα emission on neutral beam injection experiments in the GAMMA10 central cell2004

    • Author(s)
      Y.Higashizono, Y.Nakashima, et al.
    • Journal Title

      Review of Scientific.Instruments 75-No.10

      Pages: 4094-4096

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Development of an integrated pellet diagnostic system for fueling pellets2004

    • Author(s)
      Y.Kubota, M.Yoshikawa, Y.Nakashima, et al.
    • Journal Title

      Review of Scientific.Instruments 75-No.10

      Pages: 4228-4230

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Edge plasma measurements near the minimum-B anchor cell of GAMMA 10 using Langmuir probe and calorimeter arrays2004

    • Author(s)
      Y.Nakashima, et al.
    • Journal Title

      Review of Scientific.Instruments 75-No.10

      Pages: 4308-4310

    • NAID

      120007131770

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Neutral transport analysis in non-axisymmetric anchor region of the GAMMA 10 tandem mirror using a Monte-Carlo simulation2004

    • Author(s)
      Y.Nakashima, et al.
    • Journal Title

      Journal of Plasma and Fusion Research, SERIES 6

      Pages: 546-549

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 解説:モンテカルロコードDEGASを用いた中性粒子輸送シミュレーションの技法 -ガンマ10への適用-2004

    • Author(s)
      中島洋輔
    • Journal Title

      J.Plasma and Fusion Research 80 No.10

      Pages: 813-824

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Diagnostic system of Hα emission on neutral beam injection experiments in the GAMMA10 central cell2004

    • Author(s)
      Y.Higashizono, Y.Nakashima, et al.
    • Journal Title

      Review of Scientific Instruments 75 No.10

      Pages: 4094-4096

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Development of an integrated pellet diagnostic system for fueling pellets2004

    • Author(s)
      Y.Kubota, M.Yoshikawa, Y.Nakashima, et al.
    • Journal Title

      Review of Scientific Instruments 75 No.10

      Pages: 4228-4230

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Edge plasma measurements near the minimum-B anchor cell of GAMMA 10 using Langmuir probe and calorimeter arrays2004

    • Author(s)
      Y.Nakashima,.et al.
    • Journal Title

      Review of Scientific Instruments 75 No.10

      Pages: 4308-4310

    • NAID

      120007131770

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Neutral transport analysis in non-axisymmetric anchor region of the GAMMA 10 tandem mirror using a Monte-Carlo simulation2004

    • Author(s)
      Nakashima Yousuke, et al.
    • Journal Title

      Journal of Plasma and Fusion Research, SERIES 6

      Pages: 546-549

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Technique of Neutral Transport Simulation Using the DEGAS Monte-Carlo Code -Application to GAMMA 10-2004

    • Author(s)
      Nakashima Yousuke
    • Journal Title

      Journal of Plasma Fusion Research 80 No.10

      Pages: 813-824

    • NAID

      110003827861

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Diagnostic system of Hα emission on neutral beam injection experiments in the GAMMA10 central cell2004

    • Author(s)
      Y.Higashizono, Y.Nakashima, et al.
    • Journal Title

      Review of Scientific. Instruments 75-No.10

      Pages: 4094-4096

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Development of an integrated pellet diagnostic system for fueling pellets2004

    • Author(s)
      Y.Kubota, M.Yoshikawa, Y.Nakashima
    • Journal Title

      Review of Scientific. Instruments 75-No.10

      Pages: 4228-4230

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Edge plasma measurements near the minimum-B anchor cell of GAMMA 10 using Langmuir probe and calorimeter arrays2004

    • Author(s)
      Y.Nakashima, et al.
    • Journal Title

      Review of Scientific. Instruments 75-No.10

      Pages: 4308-4310

    • NAID

      120007131770

    • Related Report
      2004 Annual Research Report
  • [Publications] Y.Ishimoto, Y.Nakashima, et al.: "Development of Carbon Sheet pump for control of hydrogen recycling in the GAMMA 10 tandem mirror"Fusion Engineering Design. 65No.3. 429-432 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.K.Islam, Y.Nakashima, et al.: "Fusion oriented plasma research in Bangladesh : Impact of dust plasma"Nuclear Fusion. 43No.9. 914-921 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.K.Islam, Y.Nakashima: "Comment on "Charging of dust grains in a plasma with negative ions" [Phys. Plasmas 10, 1518 (2003)]"Physics of Plasmas. 10No.10. 4185-4187 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.K.Islam, Y.Nakashima: "Theoretical Investigation of Langmuir Wave Instability in Irradiated Dusty Plasmas"Journal of Plasma and Fusion Research, SERIES. 6(印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Nakashima, et al.: "Neutral transport analysis in non-axisymmetric anchor region of the GAMMA 10 tandem mirror using a Monte-Carlo simulation"Journal of Plasma and Fusion Research, SERIES. 6(印刷中). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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