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Effect of magnetic well on the formation of edge transport barrier

Research Project

Project/Area Number 16360462
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

OKAMURA Shoichi  National Institute for Fusion Science, LHD department, Professor (60115540)

Co-Investigator(Kenkyū-buntansha) ISOBE Mitsutaka  National Institute of Fusion Science, LHD department, Research associate (00300731)
FUJISAWA Akihide  National Institute of Fusion Science, LHD department, Assistant Professor (60222262)
MATSUO Keiji  Fukuoka Institute of Technology, Engineering department, Professor (10199755)
IGUCHI Harukazu  National Institute of Fusion Science, LHD department, Assistant Professor (40115522)
MATSUOKA Keisuke  National Institute of Fusion Science, LHD department, Professor (70023736)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsEdge transport barrier / H-mode / Magnetic axis shift / Magnetic well / Zonal flow / Fluctuation measurement / 揺動測定 / ゾーナルフロー / ETB / 周辺部輸送障壁 / Transport Barrier / 磁気丘
Research Abstract

Objectives of this research program are 1) to study the relation between the magnetic well configuration and the confinement improvement with the edge transport barrier (ETB) formation, and 2) to investigate the changes of amplitude and spectrum of plasma turbulence due to the ETB formation. Advanced diagnostic technologies were fully utilized for the turbulence measurements with the ETB formation. Zonal flows were identified by a heavy ion beam probe (HIBP) measurements which was the first demonstration of the existence of such a meso-scale structural formation in the toroidal magnetic confinement experiments. The reduction of plasma fluctuations was shown in the beam emission spectroscopy (BES) measurements with the formation of ETB and the profile data of the fluctuations exhibited the strong suppression of them at the normalized minor radius 0.95. The fluctuation measurements using Langmuir probes also showed the existence of the transport barrier at this minor radius. The reduction of the fluctuations with the ETB formation was confirmed by two other density fluctuation diagnostic a phase contrast method with YAG laser and the microwave scattering diagnostics. A carbon limiter was prepared for the experiment to compare the magnetic configurations with magnetic hill region and the one with magnetic well. The limiter was used to cut off the magnetic hill part at the plasma edge. In order to obtain good discharge condition, a conditioning of the carbon limiter was intensively made because the control of the neutral gas pressure at the plasma edge is very important for the ETB formation. At the final phase of the program, the conditioning of the carbon head was not sufficient for getting the clear results in the comparison of two magnetic configurations in the ETB formation.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (24 results)

All 2007 2006 2005 2004

All Journal Article (19 results) (of which Peer Reviewed: 3 results) Presentation (5 results)

  • [Journal Article] Improved Confinement and Related Physics Study in the Compact Helical System2007

    • Author(s)
      S.Okamura, et. al.
    • Journal Title

      Fusion Science and Technology 51

      Pages: 46-53

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] 'Improved confinement and related physics study in the Compact Helical System'2007

    • Author(s)
      S. Okamura, T. Akiyama, A. Fujisawa, K. Ida, H. Iguchi, M. Isobe, S. Kado, T. Minami, K. Nagaoka, K. Nakamura, S. Nishimura, K. Matsuoka, H. Matsushita, H. Nakano, S. Ohshima, T. Oishi, A. Shimizu, C. Suzuki, C. Takahashi, K. Toi, Y. Yoshimura, M. Yoshinuma, CHS group
    • Journal Title

      Fusion Science and Technology Vol.51

      Pages: 46-53

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Improved Confinement and Related Physics Study in the Compact Helical System2007

    • Author(s)
      S.Okamura
    • Journal Title

      Fusion Science and Technology 51, no.1

      Pages: 46-53

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Progress of Confinement Physics Study in Compact Helical System2007

    • Author(s)
      S.Okamura
    • Journal Title

      Proceedings of 21st IAEA Fusion Energy Conference (CD ROM)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Plasma-Confinement Physics Study in Compact Helical System2006

    • Author(s)
      S.Okamura, et. al.
    • Journal Title

      Journal of the Korean Physical Society 49

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] 'Scaling of power threshold for edge transport barrier formation in CHS with density, magnetic field and magnetic configuration'2006

    • Author(s)
      T Akiyama, S Okamura, T Minami, A Fujisawa, T Oishi, S Kado, M Takeuchi, K Toi, K Ida, M Yoshinuma, K Matsuoka, M Isobe, S Nishimura, C Suzuki, Y Yoshimura, K Nagaoka, C Takahashi, the CHS Experimental Group
    • Journal Title

      Plasma Physics and Controlled Fusion Vol.48

      Pages: 1683-1692

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 'Plasma-confinement physics study in Compact Helical System'2006

    • Author(s)
      S. Okamura, T. Akiyama, A. Fujisawa, K. Ida, H. Iguchi, R. Ikeda, M. Isobe, Y. Jinguji, T. Kobuchi, K. Matsuoka, H. Matsushita, T. Minami, S. Mizuno, K. Nagaoka, K. Nakamura, H. Nakano, S. Nishimura, S. Ohshima, A. Shimizu, C. Suzuki, C. Takahashi, M. Takeuchi, K. Toi, Y. Yoshimura, M. Yoshinuma, S. Kado, K. Matsuo, T. Oishi
    • Journal Title

      Journal of Korean Physical Society Vol.49

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Plasma-Confinement Physics Study in Compact Helical System2006

    • Author(s)
      S.Okamura
    • Journal Title

      Journal of the Korean Physical Society 49, Suppl

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Spectrograph of electric field fluctuation in toroidal helical plasma2006

    • Author(s)
      A.Fujisawa
    • Journal Title

      Plasma Physics and Controlled Fusion 48, no.4

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Edge and internal transport barrier formation in CHS2005

    • Author(s)
      S.Okamura, et. al.
    • Journal Title

      Nuclear Fusion 45

      Pages: 863-870

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] 'Edge and internal transform barrier formation in CHS'2005

    • Author(s)
      S. Okamura, T. Minamai, T. Akiyama, T. Oishi, A. Fujisawa, K. Ida, H. Iguchi, M. Isobe, S. Kado, K. Nagaoka, K. Nakamura, S. Nishimura, K. Matsuoka, H. Matsushita, H. Nakano, M. Nishiura, S. Ohshima, A. Shimizu, C. Suzuki, C. Takahashi, K. Toi, Y. Yoshimura, M. Yoshinuma, CHS group
    • Journal Title

      Nuclear Fusion Vol.45

      Pages: 863-870

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Edge and internal transport barrier formation in CHS2005

    • Author(s)
      S.Okamura
    • Journal Title

      Nuclear Fusion 45, no.8

      Pages: 863-870

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Improved confinement and related physics study in Compact Helical System2005

    • Author(s)
      S.Okamura
    • Journal Title

      Proceedings of International Stellarator Workshop (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Two-dimensional diagnostic of edge plasma structure using a lithium beamprobe in a compact helical system2005

    • Author(s)
      K.Nakamura
    • Journal Title

      Review of Scientific Instruments 76, no.1

      Pages: 13504-13504

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Identification of Zonal Flow in a Toroidal Plasma'2004

    • Author(s)
      A. Fujisawa, K. Itoh, H. Iguchi, K. Matsuoka, S. Okamura, A. Shimizu, T. Minami, Y. Yoshimura, K. Nagaoka, C. Takahashi, M. Kojima, H. Nakano, S. Ohsima, S. Nishimura, M. Isobe, C. Suzuki, T. Akiyama, K. Ida, K. Toi, S.-I. Itoh, P. H., Diamond
    • Journal Title

      Physical Review Letters Vol.93

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Confinement characteristics of the quasi-axisymmetric stellarator CHS-qa2004

    • Author(s)
      S.Okamura
    • Journal Title

      Nuclear Fusion 44, no.4

      Pages: 575-581

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Edge Transport barrier formation in compact helical system2004

    • Author(s)
      S.Okamura
    • Journal Title

      Plasma Physics and Controlled Fusion 46, no.5

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Edge and Internal Transport Barrier Formations in CHS2004

    • Author(s)
      S.Okamura
    • Journal Title

      Proceedings of Fusion Energy Conference 2004 (CD ROM)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Identification of Zonal Flows in a Toroidal Plasma2004

    • Author(s)
      A.Fujisawa
    • Journal Title

      Physical Review Letters 93, no.16

    • Related Report
      2004 Annual Research Report
  • [Presentation] CHS group, Edge and Internal Transport Barrier Formations in CHS2007

    • Author(s)
      S. Okamura, T. Minami, T. Akiyama, T. Oishi, A. Fujisawa, K. Ida, H. Iguchi, M. Isobe, S. Kado, K. Nagaoka, K. Nakamura, S. Nishimura, K. Matsuoka, H. Matsushita, H. Nakano, M. Nishiura, S. Ohshima, A. Shimizu, C. Suzuki, C. Takahashi, K. Toi, Y. Yoshimura, M. Yoshinuma
    • Organizer
      20th IAEA Fusion Energy Conference
    • Place of Presentation
      Vilamoura(Portugal)
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Presentation] Summary of H-mode studies in Compact Helical System2007

    • Author(s)
      S. Okamura, T. Minami, T. Akiyama, A. Fujisawa, K. Ida, H. Iguchi, R. Ikeda, M. Isobe, S. Kadoa, K. Matsuob, K. Matsuoka, K. Nagaoka, K. Nakamura, H. Nakano, S. Nishimura, T. Oishi, S. Ohshima, A. Shimizu, C. Suzuki, C. Takahashi, M. Takeuchi, K. Toi, N. Tomitac, S. Tsuji-Iioc, Y. Yoshimura, M. Yoshinuma, CHS group
    • Organizer
      Intenational Stellarator/Heliotron Workshop
    • Place of Presentation
      Toki(Japan)
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Presentation] Progress of Confinement Physics Study in Compact Helical System2006

    • Author(s)
      S.Okamura, et. al.
    • Organizer
      21st IAEA Fusion Energy Conference
    • Place of Presentation
      成都(中国)
    • Year and Date
      2006-10-19
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Presentation] Plasma Confinement Physics Study in Compact Helical System2006

    • Author(s)
      S. Okamura, T. Akiyama, A. Fujisawa, K. Ida, H. Iguchi, R. Ikeda, M. Isobe, Y. Jinguji, S. Kado, T. Kobuchi, K. Matsuo, K. Matsuoka, H. Matsushita, T. Minami, S. Mizuno, K. Nagaoka, K. Nakamura, H. Nakano, S. Nishimura, T. Oishi, S. Ohshima, A. Shimizu, C. Suzuki, C. Takahashi, M. Takeuchi, K. Toi, Y. Yoshimura, M. Yoshinuma
    • Organizer
      21st IAEA Fusion Energy Conference
    • Place of Presentation
      Chendu(Chine)
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Presentation] Plasma Confinement Physics Study in Compact Helical System2005

    • Author(s)
      S. Okamura, T. Akiyama, A. Fujisawa, K. Ida, H. Iguchi, R. Ikeda, M. Isobe, Y. Jinguji, S. Kado, T. Kobuchi, K. Matsuo, K. Matsuoka, H. Matsushita, T. Minami, S. Mizuno, K. Nagaoka, K. Nakamura, H. Nakano, S. Nishimura, T. Oishi, S. Ohshima, A. Shimizu, C. Suzuki, C. Takahashi, M. Takeuchi, K. Toi, Y. Yoshimura and M. Yoshinuma
    • Organizer
      5th General Scientific Assembly of the Asia Plasma and Fusion Association
    • Place of Presentation
      Jeju island(Korea)
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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