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Relation between a plasma confinement improvement due to internal transport barrier formation and the effects of sheared flows on the suppression of turbulent vortices

Research Project

Project/Area Number 18360441
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionUniversity of Tsukuba

Principal Investigator

CHO Teruji  University of Tsukuba, Graduate School of Pure and Applied Sciences, Professor (80171958)

Co-Investigator(Kenkyū-buntansha) HIRATA Mafumi  University of Tsukuba, Graduate School of Pure and Applied Sciences, Assistant Professor (70222247)
KOHAGURA Junko  University of Tsukuba, Graduate School of Pure and Applied Sciences, Assistant Professor (60302345)
沼倉 友晴  筑波大学, 大学院・数理物質科学研究科, 講師 (90375379)
岸本 泰明  京都大学, 大学院・エネルギー科学研究科, 教授 (10344441)
八坂 保能  神戸大学, 工学部・電気電子工学科, 教授 (30109037)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥11,840,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2007: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2006: ¥6,900,000 (Direct Cost: ¥6,900,000)
Keywordsinternal transport barrier / active cotrol of ITB formation / ITER / mirro plasma / turbulence reduction / confinement improvement / economic fusion plant / ITB / 核融合 / 電場シアー / 乱流 / プラズマ閉じ込め / 帯状流 / 層流 / X線
Research Abstract

Anomalous particle and energy cross-field transport is one of the most critical issues in magnetic plasma confinement for fusion, as well as in the physics of magnetized plasmas in general. In magnetic confinement systems with different magnetic-field topologies (e. g., tokamaks, stellarators, and mirrors), recent experiment shave shown that low-frequency (LF) turbulence and the associated anomalous cross-field plasma transport exhibit rather common features including high-confinement (H) mode transition sand internal transport-barrier (ITB) formation.
The controlled formation of an internal transport barrier is investigated. The barrier is localized within a layer of a strongly sheared E_r×B plasma rotation. This high-vorticity layer is anticipated to be formed and maintained by plasma heating, which generates a layer with a partial loss of electrons that modifies the initial Gaussian radial potential profile into a non-monotonic one with a hump structure. The local gradients of T_I and T_e are also expected to be enhanced in the ITB layer, similarly to those of the ITB in tokamaks and stellarators. Reductions in the effective ion and electron thermal diffusivities are thus anticipated in the barrier layer A reduction of the observed low-frequency turbulence in the ITB layer and a partial decoupling of the turbulent structures localized on either side of the layer are demonstrated. Recently, we have obtained the ideas of various controlled methods, although unexpected matters disturbed their reports. These new methods will be extended in future.
Such externally controlled transport barrier formation is of great importance for the fusion plasma upgrade including ITER plasmas in terms of the active control of the internal transport barrier formation.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (49 results)

All 2008 2007 2006

All Journal Article (36 results) (of which Peer Reviewed: 15 results) Presentation (12 results) Book (1 results)

  • [Journal Article] Active control of internal transport barrier formation due to off-axis electron-cyclotron heating in GAMMA 10 experiments2008

    • Author(s)
      T., Cho, et. al.
    • Journal Title

      Physics of Plasmas (5月号)(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Active control of internal transport barrier formation due to off-axiselectron-cyclotron heating in GAMMA 10 experiments2008

    • Author(s)
      T. Cho, et. al.
    • Journal Title

      Physic sof Plasmas (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Overview of Recent Progress in the GAMMA 10 Tandem Mirror2007

    • Author(s)
      T., Cho, et. al.
    • Journal Title

      Transacitions of Fusion Science and Technology 51

      Pages: 11-16

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Study of the Effects of Plasma-Confining Potenials Using End-Loss Analysing Systems2007

    • Author(s)
      M., Hirata, et. al.
    • Journal Title

      Transacitions of Fusion Science and Technology 51

      Pages: 183-185

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Effects of Plasma Confining Potentials and the Associated Radially Sheared Electric Fields on the Plasma Energy Confinement2007

    • Author(s)
      T., Numakura, et. al.
    • Journal Title

      Transacitions of Fusion Science and Technology 51

      Pages: 343-345

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Investigation of Electron Distribution Functions in the Plug Region of the GAMMA 10 Tandem Mirror2007

    • Author(s)
      J., Kohagura, et. al.
    • Journal Title

      Transacitions of Fusion Science and Technology 51

      Pages: 204-207

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Keynote Speech : Recent Progress in the GAMMA 10 Tandem Mirror2007

    • Author(s)
      M., Hirata, et. al.
    • Journal Title

      Invited: Proc. 7th Symposium on Current Trends in Intermational Fusion Research: A Review

      Pages: 45-47

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A Novel Position-Sensitive Ion-Current Detector Array Using a Self-Collection Method for Secondary-Electron Suppression2007

    • Author(s)
      M., Hirata, et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A 573

      Pages: 34-37

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] X-ray Tomography Systems for Observations of Electron Cyclotron Heated Plasmas Using Novel Position-Sensitive X-ray Semiconductor-Detector Arrays2007

    • Author(s)
      T., Numakura, et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A 573

      Pages: 53-56

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Effects of Radially Sheared Electric Field on Turbulence Reduction Analyzed with End-Loss Analysing Systems2007

    • Author(s)
      M., Hirata, et. al.
    • Journal Title

      Plasma and Fusion.Research 2

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Overview of Recent Progress in the GAMMA 10 Tandem Mirror2007

    • Author(s)
      T. Cho, et. al.
    • Journal Title

      Transactions of Fusion Science and Technology 51

      Pages: 11-16

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Study of the Effects of Plasma-Confining Potentials Using End-Loss Analysing Systems2007

    • Author(s)
      M. Hirata, et. al.
    • Journal Title

      Transactions of Fusion Science and Technology 51

      Pages: 183-185

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Effects of Plasma Confining Potentials and the Associated Radially Sheared Electric Fields on the Plasma Energy Confinement2007

    • Author(s)
      T. Numakura, et. al.
    • Journal Title

      Transactions of Fusion Science and Technology 51

      Pages: 343-335

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Investigation of Electron Distribution Functions in th ePlug Region of the GAMMA 10 Tandem Mirror2007

    • Author(s)
      J. Kohagura, et. al.
    • Journal Title

      Transactions of Fusion Science and Technology 51

      Pages: 204-207

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Keynote Speech : Recent Progress in the GAMMA 10 Tandem Mirror2007

    • Author(s)
      M. Hirata, et. al.
    • Journal Title

      Proc.7th Symposiumon Current Trends in Internationa lFusion Research A Review

      Pages: 45-47

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A Novel Position-Sensitive Ion-Current Detector Array Usinga Self-Collection Method for Secondary-Electron Suppression2007

    • Author(s)
      M. Hirata, et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics ResearchA 573

      Pages: 34-37

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Observations of Electron Cyclotron Heated Plasmas Using Novel Position-Sensitive X-ray Semiconductor-Detector Arrays2007

    • Author(s)
      T. Numakura, et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics ResearchA 573

      Pages: 53-56

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Effects of Radially Sheared Electric Field on Turbulence Reduction Analyzed with End-Loss Analysing Systems2007

    • Author(s)
      M. Hirataetal, et. al.
    • Journal Title

      Plasma and Fusion Research 5

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A Novel Position-Sensitive Ion-Current Detector Array Using A Self-Collection Method for Secondary-Electron Suppression2007

    • Author(s)
      M. Hirata, et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A Vol.573

      Pages: 34-37

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] X-ray Tomography Systems for Observations of Electron Cyclotron Heated Plasm as Using Novel Position-Sensitive X-ray Semiconductor-Detector Arrays2007

    • Author(s)
      T. Numakura, et. al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A Vol.573

      Pages: 53-56

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Novel Position-Sensitive Ion-Current Detector Array Using A Self-Collection Method for Secondary-Electron Suppression2007

    • Author(s)
      M.Hirata et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A Vol.573

      Pages: 34-37

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Progress in Potential Formation and Radial-Transport-Barrier Production for Turbulence Suppression and Improved Confinement in GAMMA 102006

    • Author(s)
      T., Cho, et. al.
    • Journal Title

      Proc.21st IAEA Fusion Energy Conference

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Simultaneous measurements of ion and electron currents using a novel compact electrostatic end-loss-current detector2006

    • Author(s)
      M., Hirata, et. al.
    • Journal Title

      Review of Scientific Instruments 77

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Experimental Estimation of the Local Energy Balance of the Potential-Confining Electrons in Tandem-Mirror Plasmas2006

    • Author(s)
      T., Numakura, et. al.
    • Journal Title

      Review of Scientific Instruments 77

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] X-ray diagnostics for investigating electron distribution functions in the central cell of the GAMMA 10 tandem mirror2006

    • Author(s)
      J., Kohagura, et. al.
    • Journal Title

      Review of Scientific Instruments 77

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Comprehensive Study of Relationship between Electron Distributions and Performances of Microwave and Mirror Devices2006

    • Author(s)
      K., Ogura, et. al.
    • Journal Title

      Annual Report of National Institute for Fusion Science April 2005-March 2006

      Pages: 491-491

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Progress in Potential Formation and Radial-Transport-Barrier Production for Turbulence Suppression andImproved Confinement in GAMMA102006

    • Author(s)
      T. Cho, et. al.
    • Journal Title

      Proc.21st IAEA Fusion Energy Conference

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Simultaneous measurements of ion and electron currents using a novel compact electrostatic end-loss-current detector2006

    • Author(s)
      M.Hirata, et. al.
    • Journal Title

      Review of Scientific Instruments 77

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Experimental Estimation of the Local Energy Balance of the Potendai-Confining Electrons in Tandem-Mirror Plasmas2006

    • Author(s)
      T. Numakura, et. al.
    • Journal Title

      Review of Scientific Instruments 77

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] X-ray diagnostics for investigating electron distribution functions in the central cell of the GAMMA 10 tandem mirror2006

    • Author(s)
      J. Kohagura, et. al.
    • Journal Title

      Review of Scientific Instruments 77

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Comprehensive Study of Relationship between Electron Distributions and Performmances of Microwaveand Mirror Devices2006

    • Author(s)
      K. Ogura, et. al.
    • Journal Title

      Annual Report of National Institute for Fusion Science

      Pages: 491-491

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Observation and Control of Transverse Energy-Transport Barrier due to the Formation of an Energetic-Electron Layer with Sheared ExB flow2006

    • Author(s)
      T.Cho et al.
    • Journal Title

      Physical Review letters Vol.97,No.5

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Progress in Potential Formation and Radial-Transport-Barrier Production for Turbulence Suppression and Improved Confinement in GAMMA 102006

    • Author(s)
      T.Cho et al.
    • Journal Title

      Proc. 21st IAEA Fusion Energy Conference

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Simultaneous Measurements of Ion and Electron Currents Using a Novel Compact Electrostatic End-Loss-Current Detector2006

    • Author(s)
      M.Hirata et al.
    • Journal Title

      Review of Scientific Instruments Vol.77,No.10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] X-ray diagnostics for investigating electron distribution functions and plasma spatial strctres in the GAMMA 10 tandem mirror2006

    • Author(s)
      J.Kohagura et al.
    • Journal Title

      Review of Scientific Instruments Vol.77,No.10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Experimental estimation of the local energy balance of the potential-confinig electrons in tandem-mirror plasmas2006

    • Author(s)
      T.Numakura et al.
    • Journal Title

      Review of Scientific Instruments Vol.77,No.10

    • Related Report
      2006 Annual Research Report
  • [Presentation] Improved Mirror-Plasma Regime Guarded by Coaxially Nested Intense ExB Radially Sheared Flow Having a Peaked-on-Axis Sheared Vorticity2007

    • Author(s)
      T. Cho, et. al.
    • Organizer
      11th IAEA Technical Meeting on H-mode Physics and Transport Barriers
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Progress High confinement in fusion oriented plasmas with k V-order potential, ion, and electron temperatuers with controlled radial turbulent transport in GAMMA 102007

    • Author(s)
      T. cho, et. al.
    • Organizer
      49th Annual Meeting of the Division of Plasma Physics of the American Physical Society
    • Place of Presentation
      Orland, Florida, USA
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Improved Mirror-Plasma Regime Guarded by Coaxially Nested Intense ExB Radially Sheared Flow Having a Peaked-on-Axis Sheared Vorticity2007

    • Author(s)
      T. Cho, et. al.
    • Organizer
      11th IAEA Technical Meeting on H-mode Physics and Transport Barriers
    • Place of Presentation
      Tsukuba, JAPAN
    • Related Report
      2007 Annual Research Report
  • [Presentation] Investigation of Neutron Fluence Dependence o fX-ray Energy Responses2006

    • Author(s)
      J. Kohagura, et. al.
    • Organizer
      Nuclear Fusion Facility Research Cooperation Meeting 2006
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      2006-06-15
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of Electric-Field-Shear Effects on Turbulence Suppression with Confinement Improvement using X-ray Diagnostics in GAMMA 102006

    • Author(s)
      J. Kohagura, et. al.
    • Organizer
      The Japan Geoscience Union Meeting 2006
    • Place of Presentation
      Makuhari, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of the Effects of Plasma-Confining Potentials and Radially Sheared Electric Fields Using End-Loss Analyzers2006

    • Author(s)
      M. Hirataet, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of the Electron Energy Confinement based on X-ray Energy Pulse Height Analysis in GAMMA 102006

    • Author(s)
      N. Morimotoetal, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of the Effects of Plasma-Confining Potentials and Radially Sheared Electric Fields by the Use of X-ray Diagnostics in GAMMA102006

    • Author(s)
      S. Kiminami, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Effects of Plasma Confining Potentials and the Associated Radially Sheared Electric Fields on the Plasma Energy Confinement2006

    • Author(s)
      T. Numakura, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of Potential Formation Physics and Effects of Confining Potentials and Radially Sheared Electric Fields using X-ray Diagnostics in GAMMA102006

    • Author(s)
      J. Kohagura, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Study of the Effects of High-Energy Electron Cylinder in GAMMA 10 Using End-Loss Analyzers2006

    • Author(s)
      M. Ito, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Diagnostics of Plasma-Confining Potentials for Improving Plasma Confinement due to Electric Fields2006

    • Author(s)
      M. Hira, et. al.
    • Organizer
      23rd Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
    • Place of Presentation
      Tsukuba, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Book] プラズマエネルギーのすべて2007

    • Author(s)
      プラズマ・核融合学会 編(長 照二 他)
    • Total Pages
      166
    • Publisher
      日本実業出版社
    • Related Report
      2006 Annual Research Report

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Published: 2006-04-01   Modified: 2016-04-21  

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