• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2012 Fiscal Year Final Research Report

Transition to helical RFP states and associated confinement improvement in a spherical RFP

Research Project

  • PDF
Project/Area Number 22360390
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionKyoto Institute of Technology

Principal Investigator

MASAMUNE Sadao  京都工芸繊維大学, 工芸科学研究科, 教授 (00157182)

Co-Investigator(Kenkyū-buntansha) HIMURA Haruhiko  京都工芸繊維大学, 工芸科学研究科, 准教授 (30311632)
SANPEI Akio  京都工芸繊維大学, 工芸科学研究科, 助教 (90379066)
Project Period (FY) 2010 – 2012
Keywordsプラズマ・核融合 / 自己組織化 / エネルギー全般
Research Abstract

It has been confirmed from experimental results in RELAX that the quasi-single helicity (QSH) state can be achieved easily in low-aspect-ratio machine. Magnetic measurements and soft-X ray imaging diagnostics have revealed dense or high-temperature helical core with steep gradient in the SXR emissivity profile at the helical boundary which may suggest the electron thermal transport barrier in the QSH state. Feedback stabilization of the m/n=1/2 kink mode (RWM) has resulted in improved discharge duration by ~50% (from 2 ms to 3 ms). The Thomson scattering measurement has revealed that the central electron temperature reaches 200eV at Ip~120kA, corresponding to the electron beta of ~10%. The electron parameters have reached the designed values in the low-A RFP machine RELAX.

  • Research Products

    (67 results)

All 2013 2012 2011 2010 Other

All Journal Article (13 results) (of which Peer Reviewed: 13 results) Presentation (53 results) Remarks (1 results)

  • [Journal Article] Asymmetric toroidal flux generation due to phase locking of internally resonant tearing modes in the RELAX reversed-field pinch2013

    • Author(s)
      R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose
    • Journal Title

      Plasma Phys. Control. Fusion

      Volume: 15005 Pages: 55

    • DOI

      DOI:10.1088/0741-3335/55/1/015005

    • Peer Reviewed
  • [Journal Article] Phase Locking and Unlocking Associated with Transition to Quasi-Single Helicity State in RELAX Reversed Field Pinch2012

    • Author(s)
      R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: No.11 Pages: 81

    • DOI

      DOI:10.1143/JPSJ.81.115001

    • Peer Reviewed
  • [Journal Article] Modeling of Formation of Helical Structures in Reversed-Field Pinch2012

    • Author(s)
      N. Mizuguchi, A. Sanpei, S. Fujita, K. Oki, H. Himura, S. Masamune, K. Ichiguchi
    • Journal Title

      Plasma Fusion Res

      Volume: 2403117 Pages: 7

    • DOI

      DOI:10.1585/pfr.7.2403117

    • Peer Reviewed
  • [Journal Article] Design and Initial Result of Time-Resolved Vertical Soft X-Ray Imaging System in Low-A RFP2012

    • Author(s)
      A. Sanpei, K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, K. Nishimura, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi
    • Journal Title

      Plasma Fusion Res

      Volume: 2402052 Pages: 7

    • DOI

      DOI:10.1585/pfr.7.2402052

    • Peer Reviewed
  • [Journal Article] Characterization of quasi-single-helicity states in a low-aspect-ratio RFP2012

    • Author(s)
      K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, A. Sanpei, H. Himura, S. Masamune, R. Paccagnella
    • Journal Title

      Plasma Fusion Res

      Volume: 1402028 Pages: 7

    • DOI

      DOI:10.1585/pfr.7.1402028

    • Peer Reviewed
  • [Journal Article] Tangential Image of Helical SXR Emissivity Structure in Low-Aspect-Ratio RFP2011

    • Author(s)
      A. Sanpei, K. Oki, M. Nakamura, A. Higashi, H. Motoi, D. Fukahori, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi, R. Ikezoe
    • Journal Title

      IEEE Transaction Plasma Science

      Volume: 2410 Pages: 39

    • DOI

      DOI:10.1109/TPS.2011.2160369

    • Peer Reviewed
  • [Journal Article] Observation of Helical Structure by Imaging Diagnostics in a Low-Aspect-Ratio Reversed Field Pinch2011

    • Author(s)
      T. Onchi, R. Ikezoe, K. Oki, A. Sanpei, H. Himura, S. Masamune, N. Nishino, H. Koguchi
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 114501 Pages: 80

    • DOI

      DOI:10.1143/JPSJ.80.114501

    • Peer Reviewed
  • [Journal Article] Initial Result of Successive SXR Imaging Measurement in Low-A RFP2011

    • Author(s)
      A. Sanpei, K. Oki, M. Nakamura, A. Higashi, H. Motoi, D. Fukahori, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onch, R. Ikezoe
    • Journal Title

      Plasma Fusion Res

      Volume: 2406096 Pages: 6

    • DOI

      DOI:10.1585/pfr.6.2406096

    • Peer Reviewed
  • [Journal Article] Effect of pressure-driven MHD instabilities on confinement in reactor-relevant high-beta helical plasmas2011

    • Author(s)
      K.Y. Watanabe, S. Masamune, Y. Takemura, H. Funaba, S. Sakakibara, F. Watanabe, K. Tanaka, S. Ohdachi, K. Toi, Y. Narushima, and LHD Experiment Group
    • Journal Title

      Phys. Plasmas

      Volume: 056119 Pages: 18

    • DOI

      DOI:10.1063/1.3592675

    • Peer Reviewed
  • [Journal Article] Extended operational regimes and MHD behavior in a low-aspect-ratio reversed field pinch in RELAX2011

    • Author(s)
      R. Ikezoe, K. Oki, T. Onchi, Y. Konishi, M. Sugihara, S. Fujita, A. Sanpei, H. Himura, S. Masamune
    • Journal Title

      Plasma Phys. Control. Fusion

      Volume: 025003 Pages: 53

    • DOI

      DOI:10.1088/0741-3335/53/2/025003

    • Peer Reviewed
  • [Journal Article] Recent Progress in Low-A RFP Plasma Research in RELAX2010

    • Author(s)
      A.Sanpei, R. Ikezoe, T. Onchi, K. Oki, M. Sugihara, Y. Konishi, S. Fujita, M. Nakamura, A. Higashi, H. Motoi, H. Himura, S. Masamune
    • Journal Title

      Plasma Fusion Res

      Volume: S2063 Pages: 5

    • DOI

      DOI:10.1585/pfr.5.S2063

    • Peer Reviewed
  • [Journal Article] Density Regimes of Low-Aspect-Ratio RFP Plasmas in RELAX2010

    • Author(s)
      M. Sugihara, K. Oki, R. Ikezoe, T. Onchi, A. Sanpei, H. Himura, S. Masamune, T. Akiyama, A. Ejiri, K. Sakamoto, K. Nagasaki, V. Zhuravlev
    • Journal Title

      Plasma Fusion Res

      Volume: S2061 Pages: 5

    • DOI

      DOI:10.1585/pfr.5.S2061

    • Peer Reviewed
  • [Journal Article] Tangential soft-x ray imaging for three-dimensional structural studies in a reversed field pinch2010

    • Author(s)
      T. Onchi, R. Ikezoe, K. Oki, A. Sanpei, H. Himura, S. Masamune
    • Journal Title

      Rev. Sci. Instrum

      Volume: 073502 Pages: 81

    • DOI

      DOI:10.1063/1.3455216

    • Peer Reviewed
  • [Presentation] RFPの内部構造変化におけるMHD不安定性の役割2013

    • Author(s)
      三瓶明希夫,政宗貞男,RELAX Group
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      20130326-29
  • [Presentation] RELAXにおける低アスペクト比RFPのMHD不安定性のフィードバック制御2012

    • Author(s)
      中木聖也,政宗貞男他
    • Organizer
      第29回プラズマ・核融合学会年会
    • Place of Presentation
      春日市
    • Year and Date
      20121127-30
  • [Presentation] RELAXプラズマの高性能化シナリオ2012

    • Author(s)
      政宗貞男他
    • Organizer
      第29回プラズマ・核融合学会年会
    • Place of Presentation
      福岡県春日
    • Year and Date
      20121127-30
  • [Presentation] 軟X線イメージングを用いた低アスペクト比RFPにおける三次元構造の計測と評価2012

    • Author(s)
      三瓶明希夫他他
    • Organizer
      第29回プラズマ・核融合学会年会
    • Place of Presentation
      春日市
    • Year and Date
      20121127-30
  • [Presentation] RELAXにおける軟X線イメージング計測による2次元電子温度分布測定2012

    • Author(s)
      西村香苗, 政宗貞男他
    • Organizer
      第29回プラズマ・核融合学会年会
    • Place of Presentation
      春日市
    • Year and Date
      20121127-30
  • [Presentation] RELAXプラズマのパラメータ領域2012

    • Author(s)
      田中裕之, 政宗貞男他
    • Organizer
      第29回プラズマ・核融合学会年会
    • Place of Presentation
      春日市
    • Year and Date
      20121127-30
  • [Presentation] Evaluation of 3-D Structure in low-aspect-ratio RFP RELAX2012

    • Author(s)
      A. Sanpei, S. Masamune et al.
    • Organizer
      ITC22 P4-43
    • Place of Presentation
      Toki, Japan
    • Year and Date
      20121119-22
  • [Presentation] Mode control with external fields in the low-aspect-ratio RFP(invited)2012

    • Author(s)
      A. Sanpei et al.
    • Organizer
      17th Workshop on MHD stability control
    • Place of Presentation
      New York
    • Year and Date
      20121105-7
  • [Presentation] Evaluation of 3-D structure in RELAX RFP with SXR imaging technique2012

    • Author(s)
      A. Sanpei et al.
    • Organizer
      54th Annual Meeting of the APS-DPP
    • Place of Presentation
      Providence, USA
    • Year and Date
      20121029-1102
  • [Presentation] Progress in low-aspect-ratio RFP research in RELAX2012

    • Author(s)
      S. Masamune, et al.
    • Organizer
      54th Annual Meeting of the APS-DPP
    • Place of Presentation
      Providence, USA
    • Year and Date
      20121029-1102
  • [Presentation] Direct Observation of soft-X ray filament structure and high current operation in low-aspect-ratio RFP2012

    • Author(s)
      S. Masamune et al.
    • Organizer
      24th IAEA Fusion Energy Conf
    • Place of Presentation
      San Diego, USA
    • Year and Date
      20121008-13
  • [Presentation] 軟X線イメージングによる低アスペクト比RFPの三次元構造の評価2012

    • Author(s)
      三瓶明希夫他
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      20120918-21
  • [Presentation] 低アスペクト比RFP研究の最近の進展2012

    • Author(s)
      政宗貞男他
    • Organizer
      第9回核融合エネルギー連合講演会
    • Place of Presentation
      神戸国際会議場,神戸市
    • Year and Date
      20120628-29
  • [Presentation] 非中性プラズマと熱核融合プラズマにおける自己組織化2012

    • Author(s)
      三瓶明希夫他
    • Organizer
      第61回理論応用力学講演会
    • Place of Presentation
      東京大学生産技術研究所
    • Year and Date
      20120307-09
  • [Presentation] Characteristics of MHD mode dynamics in low-A RFP machine RELAX2012

    • Author(s)
      A.Sanpei, S.Masamune, J.K. Anderson et al.
    • Organizer
      2012 US-Japan MHD Workshop, ITPA-MHD TG and EP Topical group joint meeting
    • Place of Presentation
      NIFS, Japan
    • Year and Date
      20120305-07
  • [Presentation] 低アスペクト比RFP装置RELAXにおける鞍型コイルを用いたMHD制御実験2011

    • Author(s)
      中木聖也,政宗貞男,RELAX group
    • Organizer
      核融合科学研究所共同研究会「高ベータプラズマにおける自発的フローと三次元構造の形成」
    • Place of Presentation
      核融合科学研究所
    • Year and Date
      20111219-21
  • [Presentation] Tangential and vertical Soft-X ray imaging for three-dimensional structural studies in the RFP2011

    • Author(s)
      A. Sanpei, S. Masamune, RELAX group
    • Organizer
      ITC21
    • Place of Presentation
      Toki, Japan
    • Year and Date
      20111128-1201
  • [Presentation] RELAXにおける軟X線放射強度分布の時間発展2011

    • Author(s)
      深堀大佑,政宗貞男,RELAX group
    • Organizer
      PLASMACONFERENCE2011
    • Place of Presentation
      金沢市
    • Year and Date
      20111122-25
  • [Presentation] 低アスペクト比RFP装置RELAXの改造と最適化2011

    • Author(s)
      大木健輔,政宗貞男他
    • Organizer
      PLASMA CONFERENCE2011
    • Place of Presentation
      金沢市
    • Year and Date
      20111122-25
  • [Presentation] RELAXにおける低アスペクト比RFP研究の現状と展開2011

    • Author(s)
      政宗貞男他
    • Organizer
      PLASMA CONFERENCE2011
    • Place of Presentation
      金沢市
    • Year and Date
      20111122-25
  • [Presentation] 低アスペクト比RFPにおける3次元構造研究のための二方向軟X線イメージングシステムの開発2011

    • Author(s)
      三瓶明希夫他
    • Organizer
      PLASMA CONFERENCE2011
    • Place of Presentation
      金沢市
    • Year and Date
      20111122-25
  • [Presentation] 3-D soft-X ray imaging diagnostics for the study of MHD mode dynamics in RELAX2011

    • Author(s)
      A. Sanpei, RELAX group
    • Organizer
      53rd Annual Meeting of the APS-DPP, BP9.00068
    • Place of Presentation
      Salt Lake City, USA
    • Year and Date
      20111114-18
  • [Presentation] Progress in low-aspect-ratio RFP studies in RELAX2011

    • Author(s)
      S. Masamune
    • Organizer
      53rd Annual Meeting of the APS-DPP
    • Place of Presentation
      Salt Lake City, USA
    • Year and Date
      20111114-18
  • [Presentation] Progress in characterization of low-A RFP plasmas2011

    • Author(s)
      K. Oki, A. Sanpei, S. Masamune, and RELAX group
    • Organizer
      15th IEA/RFP Workshop
    • Place of Presentation
      Madison, USA
    • Year and Date
      20111010-12
  • [Presentation] Time-resolved soft-X ray imaging diagnostics for the study of MHD mode2011

    • Author(s)
      A. Sanpei
    • Organizer
      15th IEA/RFP Workshop
    • Place of Presentation
      Madison, USA
    • Year and Date
      20111010-12
  • [Presentation] Scenarios for high-current operation in RELAX2011

    • Author(s)
      S. Masamune
    • Organizer
      15th IEA/RFP Workshop
    • Place of Presentation
      Madison, USA
    • Year and Date
      20111010-12
  • [Presentation] Roles of self-organized plasmas in fusion energy science2011

    • Author(s)
      S. Masamune
    • Organizer
      2nd Int. Symposium of Advanced Energy Science
    • Place of Presentation
      Kyoto Univ., Uji, Japan
    • Year and Date
      20110927-28
  • [Presentation] Experimental Study of Formation of Vortex Crystal Configuration in Pure Electron Plasma2011

    • Author(s)
      A. Sanpei
    • Organizer
      RIMS Camp-style Seminar
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      20110828-31
  • [Presentation] Low-aspect-ratio RFP plasma properties in two characteristic regimes in RELAX (invited)2011

    • Author(s)
      S. Masamune
    • Organizer
      Workshop on Innovation in Fusion Science
    • Place of Presentation
      Seattle, USA
    • Year and Date
      20110816-19
  • [Presentation] 球状RFPプラズマにおける画像計測2011

    • Author(s)
      三瓶明希夫,政宗貞男他
    • Organizer
      電気学会プラズマ研究会
    • Place of Presentation
      大阪工業大学
    • Year and Date
      20110807-09
  • [Presentation] Control of MHD instabilities with RMP in RFP experiments2011

    • Author(s)
      政宗貞男
    • Organizer
      核融合科学研究所共同研究会「高ベータプラズマにおけるMHD平衡、安定性及び輸送特性に関する研究」
    • Place of Presentation
      核融合科学研究所
    • Year and Date
      20110127-28
  • [Presentation] RFPにおける準単一ヘリカル構造2010

    • Author(s)
      政宗貞男
    • Organizer
      核融合科学研究所共同研究研究会「MHD理論研究の進展と課題」
    • Place of Presentation
      核融合科学研究所
    • Year and Date
      20101221-22
  • [Presentation] RFPにおける3次元自己組織化とヘリカル系におけるMHDとの関係2010

    • Author(s)
      政宗貞男
    • Organizer
      核融合科学研究所共同研究会「高ベータ自己組織化プラズマの閉じ込めと輸送現象」
    • Place of Presentation
      核融合科学研究所
    • Year and Date
      20101216-17
  • [Presentation] Development of SXR imaging system for 3-D structural studies in toroidal plasmas2010

    • Author(s)
      A. Sanpei, RELAX Group
    • Organizer
      ITC20
    • Place of Presentation
      Toki, Japan
    • Year and Date
      20101207-10
  • [Presentation] 軟X線イメージングと高速カメラによる低アスペクト比RFPの3次元構造計測2010

    • Author(s)
      三瓶明希夫,RELAX Group
    • Organizer
      第27回プラ・核学会年会
    • Place of Presentation
      北大
    • Year and Date
      20101130-1203
  • [Presentation] 低アスペクト比RFPにおけるトムソン散乱による電子温度測定2010

    • Author(s)
      元井秀彦,政宗貞男,RELAX Group
    • Organizer
      第27回プラ・核学会年会
    • Place of Presentation
      北海道大学
    • Year and Date
      20101130-1203
  • [Presentation] サドルコイルアレイによる低アスペクト比RFPプラズマの能動的MHD制御2010

    • Author(s)
      中村満,政宗貞男他
    • Organizer
      第27回プラ・核学会年会
    • Place of Presentation
      北海道大学
    • Year and Date
      20101130-1203
  • [Presentation] 低アスペクト比RFP周辺部の電子密度・電子温度分布測定によるブートストラップ電流の評価2010

    • Author(s)
      東明男,三瓶明希夫,比村治彦,政宗貞男他
    • Organizer
      第27回プラ核学会
    • Place of Presentation
      北海道大学
    • Year and Date
      20101130-1203
  • [Presentation] 低アスペクト比RFPプラズマの軟X線放射強度分布の放電領域2010

    • Author(s)
      深堀大佑,三瓶明希夫,比村治彦,政宗貞男他
    • Organizer
      第27回プラ・核学会
    • Place of Presentation
      北海道大学
    • Year and Date
      20101130-1203
  • [Presentation] 低アスペクト比RFPプラズマの放電特性と最適化2010

    • Author(s)
      大木健輔,三瓶明希夫,比村治彦,政宗貞男他
    • Organizer
      第27回プラ・核学会
    • Place of Presentation
      20101130-1203
    • Year and Date
      20101130-1203
  • [Presentation] Initial results from 3-D MHD simulation studies for low-A RFP2010

    • Author(s)
      A. Sanpei, S. Masamune, S. N. Mizuguch et al.
    • Organizer
      15th Workshop on MHD Stability Control & Joint US-Japan MHD Workshop
    • Place of Presentation
      Madison WI, USA
    • Year and Date
      20101115-17
  • [Presentation] 3-D self-organization in RFPs with connections to stellarator MHD (invited)2010

    • Author(s)
      S. Masamune
    • Organizer
      15th Workshop on MHD Stability Control & Joint US-Japan MHD Workshop
    • Place of Presentation
      Madison WI, USA
    • Year and Date
      20101115-17
  • [Presentation] Optimization of low-aspect-ratio RFP configuration in RELAX2010

    • Author(s)
      S. Masamune
    • Organizer
      52nd Annual Meeting of the APS-DPP
    • Place of Presentation
      Chicago, USA
    • Year and Date
      20101108-12
  • [Presentation] Overview of RELAX2010

    • Author(s)
      S. Masamune
    • Organizer
      2010 USTC International Workshop of RFP
    • Place of Presentation
      Hefei, China
    • Year and Date
      20101018-19
  • [Presentation] Characteristics of extremely deep reversal and Quasi-Single- Helicity (QSH) states in a low-aspect-ratio RFP2010

    • Author(s)
      A. Sanpei, S. Masamune
    • Organizer
      23rd IAEA Fusion Energy Conference
    • Place of Presentation
      Daejon, Republic of Korea
    • Year and Date
      20101010-16
  • [Presentation] Mode structure of global MHD instabilities and its effect on plasma confinement in LHD2010

    • Author(s)
      S. Masamune
    • Organizer
      23rd IAEA Fusion Energy Conference
    • Place of Presentation
      Daejon, Republic of Korea
    • Year and Date
      20101010-16
  • [Presentation] RELAXにおける低アスペクト比RFP平衡配位とMHD不安定性2010

    • Author(s)
      政宗貞男,三瓶明希夫,比村治彦他
    • Organizer
      日本物理学会2010年秋季大会
    • Place of Presentation
      大阪府立大
    • Year and Date
      20100923-26
  • [Presentation] RFPプラズマで観測された準ヘリカル磁場構造(シンポジウム講演)2010

    • Author(s)
      政宗貞男
    • Organizer
      日本物理学会2010年秋季大会
    • Place of Presentation
      大阪府立大
    • Year and Date
      20100923-26
  • [Presentation] Experimental research on low-aspect-ratio RFP2010

    • Author(s)
      K. Oki, A. Sanpei, H. Himura, S. Masamune et al.
    • Organizer
      The 5th Japan-Korea Seminar on Advanced Diagnostics for Steady-State Fusion Plasma
    • Place of Presentation
      Oita, Japan
    • Year and Date
      20100826-29
  • [Presentation] RELAX における低アスペクト比RFP 配位の研究2010

    • Author(s)
      政宗貞男他
    • Organizer
      第8回核融合エネルギー連合講演会
    • Place of Presentation
      高山市民文化会館,岐阜県高山市
    • Year and Date
      20100610-11
  • [Presentation] Contribution of KIT to LHD -Topics from collaboration research on MHD phenomena in LHD-2010

    • Author(s)
      S. Masamune
    • Organizer
      14th IEA/RFP Workshop
    • Place of Presentation
      Consorzio RFX, Padova, ITALY
    • Year and Date
      20100426-28
  • [Presentation] Helically deformed plasma in RELAX -experiments and 3-D MHD simulation-2010

    • Author(s)
      A. Sanpei
    • Organizer
      14th IEA/RFP Workshop
    • Place of Presentation
      Consorzio RFX, Padova, ITALY
    • Year and Date
      20100426-28
  • [Presentation] Equilibrium and Stability of RELAX2010

    • Author(s)
      S. Masamune
    • Organizer
      14th IEA/RFP Workshop
    • Place of Presentation
      Consorzio RFX, Padova, ITALY
    • Year and Date
      20100426-28
  • [Remarks]

    • URL

      http://nuclear.es.kit.ac.jp/new/

URL: 

Published: 2014-08-29  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi