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

Investigations on Confinement Improvement by Supressing Microscopic Instabilities in Toroidal Plasmas

Research Project

Project/Area Number 02808003
Research Category

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

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionNational Institute for Fusion Science

Principal Investigator

ITOH Kimitaka  National Inst. Fusion Science, Associate Professor, 助教授 (50176327)

Co-Investigator(Kenkyū-buntansha) FUKUYAMA Atsusi  Okayama University, Associate Professor, 助教授 (60116499)
ITOH Sanae  National Inst. Fusion Science, Associate Professor, 助教授 (70127611)
TOI Kazuo  National Inst. Fusion Science, Associate Professor, 助教授 (20093057)
NAKAJIMA Noriyoshi  National Inst. Fusion Science, Research Associate, 助手 (30172315)
SANUKI Heiji  National Inst. Fusion Science, Associate Professor, 助教授 (80109355)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1991: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1990: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsAnomalous Transport / Toroidal Plasma / Microscopic Instability / Magnetiv Hill / Current Diffusivity / Disruptive Instability / 微視見不安定性 / 磁場配位 / ドリフト反転 / スクレイプオフ層 / 境界条件
Research Abstract

The objective of this research is to develop the method to reduce the anomalous transport. Based on the working hypothesis that the cross field transport is driven by microscopic instabilities, we study the way to reduce the transport coefficient by suppressing the microinstabilities.
By this research project, we have obtained a new theoretical result on the anomalous transport in Torsatron/Heliotron configurations. The theory includes the roles of the current diffusivity. This new model formula, though appricable only to the systems with the magnetic hill, explains the majority of the experimental observations on confinement in such devices. If further verification will be gained through future examination with experiments, this method will give a guiding principle to predict a cofiguration, in which anomalous transport is reduced. In tokamaks, it has been shown that the toroidicity is a critical element to cause the anomalous transport. The theoretical model can be extended to systems with the magnetic well, by employing the ballooning formalism. The extension and generalization are left for the future study.
By studying the current diffusicity, we have obtained a new phsics picture of the disruptive phenomena. The mechanism of the accelerated growth of the global instabilities is presented. The magnetic braiding by the global instabilities gives rise to the enhanced current diffusivity, which then increases the growth rate of the mode.
In summary, this research project has shown a considerable progress in the original programme as well as in the unexpected area of the research.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (62 results)

All Other

All Publications (62 results)

  • [Publications] K.Itoh,K.Nagasaki and S.-I.Itoh: "Heat Deposition on the Partial Limitter" Jap.J.Appl.Phys.29. 1829-1830 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.-I.Itoh and K.Itoh: "Change of Transport at L- to H- mode Transition" J.Phys.Soc.Jpn. 59. 3815-3818 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh and S.-I.Itoh: "On the Relation Between the Local Transport Coefficient and the Global Confinement Scaling Law" Comment Plasma Phys.Controlled Fusion. 14. 1-11 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh and S.-I.Itoh: "Peaked-Density Profile Mode and Improved Confinement in Helical Systems" Comment Plasma Phys.Controlled Fusion. 14. 13-19 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N.Ueda,S.-I.Itoh,M.Tanaka and K.Itoh: "Design Method of Divertor in Tokamak Reactors" J.Nucl.Sci.Tech.28. 187-198 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 伊藤 公孝,伊藤 早苗: "プラズマの分布はどの様に決まっているかーートカマク・プラズマの熱・運動量・粒子の輸送ーー" 日本物理学会誌. 46. 360-367 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 伊藤 公孝: "核融合プラズマの長時間燃焼制御に関する調査研究について" 核融合研究. 65. 264-267 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh,H.Sanuki,(他): "Loss cone Region in Toroidal Helical Systems" Phys.Fluids B. 3. 1294-1296 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T.Seki,(他): "Application of the Intermediate Frequency Range Fast Wave to the JIPP TIIーU Plasma" Nucl.Fusion. 31. 1369-1381 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Ida,H.Yamada,H.Iguchi,K.Itoh,CHS Group: "Observation of Parallel Viscosity in Stellarator" Phys.Rev.Lett.67. 58-61 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh,H.Sanuki,S.-I.Itoh and K.Tani: "Effect of the Readial Electric Field on Alpha Particle Loss in Tokamaks" Nucl.Fusion. 31. 1405-1409 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S.-I.Itoh,H.Sanuki and K.Itoh: "Effect of Electric Field Inhomogeneities on Drift Wave Instabilities and Anomalous Transport" J.Phys.Soc.Japan. 60. 2505-2509 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Nagasaki,K.Itoh: "Decay Process of Maganetic Island by External Magnetic Perturbation" J.Phys.Soc.Jpn.60. 2966-2976 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H.Sanuki,K.Itoh,K.Ida,S.-I.Itoh: "On Radial Electric Field Structure in CHS Torsatron/Heliotron" J.Phys.Soc.Jpn.60. 3689-3705 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 伊藤 早苗,伊藤 公孝: "JETにおけるDーT燃焼実験迫る" 日本原子力学会誌. 33. 955-957 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Ida,S.-I.Ito,K.Itoh,S.Hidekuma,Y.Miura,and JFT-2M Group: "Density Peaking in the JET-2M Tokamak Plasma with Counter Neutral Beam Injection" Phys.Rev.Lett. 68. 182-185 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 伊藤 公孝,伊藤 早苗: "閉じ込め特性I.現象と観測(講座トロイダル・プラズマ閉じ込め入門)" 核融合研究. 67. 30-50 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh,S.-I.Itoh,and H.Sanuki: "An H-Mode-Like Bifurcation in Core Plasma of Stellarators" Comment Plasma Phys.Controlled Fusion. 15. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A.J.Lichtenberg,K.Itoh,S.-I.Itoh and A.Fukuyama: "Role of Stochasticity in Sawtooth Oscillation" Nucl.Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 伊藤 早苗,伊藤 公孝: "閉じ込め特性II.モデルと解析手法(講座トロイダル・プラズマ閉じ込め入門)" 核融合研究. 67. 136-165 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] P.Christiansen,(他): "A Global Energy Confinement HーMode Database for ITER" Nucl.Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Miura,K.Itoh,(他): "Geometric Dependence of the Scaling Law on the Energy Confinement Time in HーMode Discharges" Nucl.Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh,S.-I.Itoh and A.Fukuyama: "Impact of Improved Confinement on Fusion Research" Fusion Engineering Design. 15. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A.Fukuyama,S.-I.Itoh and K.Itoh: "A Consistency Analysis on the Tokamak Reactor" Fusion Engineering Design. 15. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh,S.-I.Itoh,and A.Fukuyama: "Energy Transport in the Steady State Plasma Sustained by the DC Helicity Injection" Comment Plasma Phys.Controlled Fusion. 15. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Itoh,H.Sanuki,S.-I.Itoh: "Influence of Fast Ion Loss on Radial Electric Field in Wendelstein VII-A Stellarator" Nuclear Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, K. Nagasaki and S. -I. Itoh: "Heat Deposition on the Partial Limiter" Jap. J. Appl. Phys. 29. 1829-1830 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. -I. Itoh and K. Itoh: "Change of Transport at L-to H-mode Transition" J. Phys. Soc. Jpn.59. 3815-3818 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh and S. -I. Itoh: "On the Relation Between the Local Transport coefficient and the Global Confinement Scaling Law" Comment Plasma Phys. Controlled Fusion. 14. 1-11 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh and S. -I. Itoh: "Peaked-Density Profile Mode and Improved Confinement in Helical Systems" Comment Plasma Phys. Controlled Fusion. 14. 13-19 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N. Ueda, S. -I. Itoh, M. Tanaka and K. Itoh: "Design Method of Divertor in Tokamak Reactors" J. Nucl Sci. Tech.28. 187-198 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, S. -I. Itoh: "How the Plasma Profile is Determined -- Transport of Heat, Momentum and Particles in Tokamak Plasmas" Buturi. 46. 360-367 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh: "On Assessment on the Control of Steady State Burn of Fusion Plasmas" Kakuyuugou Kenkyuu. 65. 264-267 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, H. Sanuki, J. Todoroki, T. Kamimura, S. -I. Itoh, A. Fukuyama and K. Hanatani: "Loss cone Region in Toroidal Helical Systems." Phys. Fluids B. 3. 1294-1296 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. Seki, R. Kumazawa, Y. Takase, A. Fukuyama, T. Watari, A. Ando, Y. Oka, O. Kaneko, K. Adati, R. Akiyama, R. Ando, T. Aoki, Y. Hamada, S. Hidekuma, S. Hirokura, K. Ida, K. Itoh, S. -I. Itoh, E. Kako, A. Karita, K. Kawahata, T. Kawamoto, Y. Kawasumi, S. Kutagawa, Y. Kitoh, M. Kojima, T. Kuroda, K. Masai, S. Morita, K. Narihara, Y. Ogawa, K. Ohkubo, S. Okajima, T. Ozeki, M. Sakamoto, M. Sasao, K. Sato, K. N. Sato, F. Shimbo, H. Takahashi, S. Tanahashi, Y. Taniguchi, K. Toi, T. Tsuzuki: "Application of the Intermediate Frequency Range Fast Wave to the JIPP TII-U Plasma" Nucl. Fusion. 31. 1369-1381 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Ida, H. Yamada, H. Iguchi, K. Itoh, CHS Group: "Observation of Parallel Viscosity in Stellarator" Phys. Rev. Lett.67. 58-61 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, H. Sanuki, S. -I. Itoh and K. Tani: "Effect of the Radial Electric Field on Alpha Particle Loss in Tokamaks" Nucl. Fusion. 31. 1405-1409 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. -I. Itoh, H. Sanuki and K. Itoh: "Effect of Electric Field Inhomogeneities on Drift Wave Instabilities and Anomalous Transport" J. Phys . Soc. Jpn.60. 2505-2509 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Nagasaki, K. Itoh: "Decay Process of Magnetic Island by External Magnetic Perturbation" J. Phys . Soc. Jpn.60. 2966-2976 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Sanuki, K. Itoh, K. Ida, S. -I. Itoh: "On Radial Electric Field Structure in CH3 Torsatron/Heliotron" J. Phys . Soc. Jpn.60. 3689-3705 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] S. -I. Itoh and K. Itoh: "DT Operation is Coming Soon on JET" J. Atomic Energy Soc. Jpn.33. 955-957 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Ida, S. -I. Itoh, K. Itoh, S. Hidekuma, Y. Miura, and JFT-2M Group: "Density Peaking in the JFT-2M Tokamak Plasma with Counter Neutral Beam Injection" Phys. Rev. Lett.68. 182-185 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh and S. -I. Itoh: "Confinement Properties I" Kakuyuugou Kenkyuu. 67. 30-50 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, S. -I. Itoh, and H. Sanuki: "An H-Mode-Like Bifurcation in Core Plasma of Stellarators" Comment Plasma Phys. Controlled Fusion. 15. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A. J. Lichtenberg, K. Itoh, S. -I. Itoh and A. fukuyama: "The Role of Stochasticity in Sawtooth Oscillation" Nucl. Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh and S. -I. Itoh: "confinement Properties II" Kakuyuugou Kenkyuu. 67. 136-165 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] P. Christiansen, J. G. Cordey, K. Thjomsen, A. Tanga, J. Deboo, D. Schissel, T. Taylor, O. Kardaun, F. Wagner, F. Ryter, S. M. Kaye, Y. Miura, N. Suzuki, M. Mori, T. Matsuda, H. Tamai, T. Takizuka, S. -I. Itoh, K. Itoh: "A Global Energy Confinement H-Mode database for ITER" Nucl. Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y. Miura, K. Itoh, S. -I. Itoh, T. Takizuka, H. Tamai, T. Matsuda, N. Suzuki, M. Mori, H. Maeda, O. Kardaun: "Geometric Dependence of the Scaling Law on the Energy Confinement Time in H-Mode Discharges" Nucl. Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, S. -I. Itoh and A. Fukuyama: "Impact of Improved Confinement on Fusion Research" Fusion Engineering Design. 15. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] A. Fukuyama, S. -I. Itoh and K. Itoh: "A Consistency Analysis on the Tokamak Reactor" Fusion Engineering Design. 15. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, S. -I. Itoh, and A. Fukuyama: "Energy Transport in the Steady State Plasma Sustained by the DC Helicity Injection" Comment Plasma Phys. Controlled Fusion. 15. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Itoh, H. Sanuki, S. -I. Itoh: "Influence of Fast Ion Loss on Radial Electric Field in Wendelstein VII-A Stellarator" Nuclear Fusion. 32. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 伊藤 公孝: "プラズマの分布は如何にして決まるか" 日本物理学会誌. 46. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 長崎 白伸: "Magnetic Field Stwcture near Plasma Boundary in Helical Systems and Diverfor Tokamaks" Japanese J.Apple Phys.29. 1336-1344 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 伊藤 公孝: "Heat Deposition on Pantial Limiter" Japanese J.Apple.Phys.29. 1829-1830 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 伊藤 早苗: "A Model of Peaked Density Protile and Inward Pinch in Tokamaks" J.Phys.Soc.Jpn.59. 3431-3434 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 伊藤 早苗: "Change of Transport at Lーto Hーmode Transition" J.Phys.Soc.Jpn.59. 3815-3818 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 東井 和夫: "Role of Edge Magnetic Shear on the Limiter Hーmode Transition of the JlPP TーIIU Tokamak" Phys Rev.Lett.64. 1895-1898 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 伊藤 早苗: "改善モ-ドとその閉じ込め改善度への評価" 核融合研究. 63. 356-379 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 伊藤 公孝: "閉込め改善の核融合炉開発の意義について" 核融合研究. 63. 442-459 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 伊藤 早苗: "Simulation Study of Scaling in SOL Plasma by Two Dimensiond Transport Code" Plasma Physics and Controlled Fusion. 32. 415-427 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 上田 憲照: "A Design Method of Diverfor in Tokamak Reactors" J.Nncl.Sci.Tech.28. (1991)

    • Related Report
      1990 Annual Research Report

URL: 

Published: 1990-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi