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2002 Fiscal Year Final Research Report Summary

Formation of Zonal flows and Kelvin-Helmholtz instabilities in magnetically confined plasmas

Research Project

Project/Area Number 13680557
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

WAKATANI Masahiro  Kyoto University, Graduate School of Energy Science, Professor, エネルギー科学研究科, 教授 (00109357)

Co-Investigator(Kenkyū-buntansha) HAMAGUCHI Satoshi  Kyoto University, Graduate School of Energy Science, Associate Professor, エネルギー科学研究科, 助教授 (60301826)
Project Period (FY) 2001 – 2002
KeywordsZonal flow / inverse cascade / electrostatic turbulence / electromagnetic turbulence / Reynolds stress / Maxwell stress / poloidal shear flow
Research Abstract

Controlling anomalous transport arising from plasma turbulence is a great challenge for the development of magnetically confined fusion devices such as tokamaks. It is of significant importance to understand the relation of turbulence and plasma flows as flows in plasmas such as zonal flows are known to suppress turbulence under high-confinement mode operations of such fusion devices. In this work, we have clarified how electromagnetic turbulence can contribute to the formation of zonal flows through stabilization of Kelvin-Helmholtz instabilities. In 2001, we focused on resistive drift-Alfven waves and resistive wall modes and performed nonlinear numerical simulations of these modes. It is found that, although the magnetic fluctuation energy due to drift Alfven modes is relatively small compared with its kinetic energy, the Maxwell stress reduces the Reynolds stress, inhibiting the formation of poloidal flows. Also we have found that, if a resistive wall is sufficiently close to the p … More lasma and the growth rate of resistive wall mode is finite, the Maxwell stress due to magnetic fluctuations diminishes poloidal flows and the flow velocities near rational surfaces become almost zero. In 2002, we focused on the resistive interchange mode (RIM) and obtained the following results
1) In the case where two resonant surfaces exist in the plasma (i.e., the case of double resonance), poloidal shear flows due to fluctuations are formed at the positions of mode resonant surfaces and the minimum rotational transform. On the other hand, in the case of non resonance, a flow is formed at the position of the minimum rotational transform
2) In the case of single resonance, nonlinear interactions of RIMs form a locally flat or even inverse-gradient density profile near the rational surfaces, which results in a density profile stable even under high-β conditions
3) The poloidal shear flows arising from fluctuations further localize the flat or inverse-gradient region in the density profile Less

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] M.Sato, S.Hamaguchi, M.Wakatani: "Destabilization of nonlinear resistive wall mode due to suppression of poloidal rotation in a cylindrical tokamak"Physics of plasmas. 10. 187-194 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Ishizawa, M.Sato, M.Wakatani: "Electron inertia effects on m=1 instability in a cylindrical tokamak with a negative central current"Physics of Plasmas. (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Wakatani, M.Sato, N.Miyato, S.Hamaguchi: "Shear flow generation due to electromagnetic instabilities"Nuclear Fusion. 43. 63-67 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takeda, S.Hamaguchi, M.Wakatani: "ELM-like behavior generated by nonlinear ion-temperature-gradient-driven mode"Plasma Physics and Controlled Fusion. 44. A487-A494 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Unemura, S.Hamaguchi, M.Wakatani: "Effect of poloidal shear flow on local flattening of density profile due to nonlinear resistive interchange mode"Plasma Physics and Controlled Fusion. 44. A507-A515 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Miyato, S.Hamaguchi, M.Wakatani: "Nonlinear behavior of resistive drift-Alfven instabilities in a magnetized cylindrical plasma"Plasma Physics Control. Fusion. 44. 1689-1705 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Miyato, S.Hamaguchi, M.Wakatani: "Resistive drift-Alfven instability in tokamak edge plasmas"Plasma Physics and Controlled Fusion. 44. A293-A298 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Miyato, S.Hamaguchi, M.Wakatani: "Plasma current effects on unstable resistive drift-Alfven modes in a magnetized cylindrical plasma"Journal of the Physical Society of Japan. 70・11. 3197-3200 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Sato, S.Hamaguchi, M.Wakatani: "Nonlinear double tearing mode in negative shear cylindrical tokamaks"Journal of the Physical Society of Japan. 70・9. 2578-2587 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Unemura, S.Hamaguchi, M.Wakatani: "Comparison between double-resonant and non-resonant mode driven conversions in a stellarator with a non-monotonic rotational transform"Journal of the Physical Society of Japan. 70・4. 983-987 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Furukawa, Y.Nakamura, S.Hamaguchi, M.Wakatani: "High-n ballooning instabilities in toroidally rotating tokamaks"Physics of Plasmas. 8・11. 4889-4897 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Sato, S. Hamaguchi, and M. Wakatani: "Destabilization of nonlinear resistive wall mode due to suppression of poloidal rotation in a cylindrical tokamak"Physics of Plasmas. 10. 187-194 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Ishizawa, M. Sato, and M. Wakatani: "Electron inertia effects on m=1 instability in a cylindrical tokamak with a negative central current"Physics of Plasmas. to appear. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Wakatani, M. Sato, N. Miyato and S. Hamaguchi: "Shear flow generation due to electromagnetic instabilities"Nuclear Fusion. 43. 63-67 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Takeda, S. Hamaguchi, and M. Wakatani: "ELM-like behavior generated by nonlinear ion-temperature-gradient-driven mode"Plasma Physics and Controlled Fusion. 44. A487-494 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Unemura, S. Hamaguchi, and M. Wakatani: "Effect of poloidal shear flow on local flattening of density profile due to nonlinear resistive interchange mode"Plasma Physics and Controlled Fusion. 44. A507-515 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Miyato, S. Hamaguchi, and M. Wakatani: "Nonlinear behavior of resistive drift-Alfven inatabilities in a magnetized cyliudrical plasma"Plasma Physics and Controlled Fusion. 44. 1689-1705 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Miyato, S. Hamaguchi and M. Wakatani: "Resistive drift-Alfven instability in tokamak edge plasmas"Plasma Physics and Controlled Fusion. 44. A293-A298 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Furukawa, Yuji Nakamura, S. Hamaguchi, and M. Wakatani: "High-n ballooning instabilities in toroidally rotating tokamaks"Physics of Plasmas. 8, No. 11. 4889-4897 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Sato, S. Hamaguchi and M. Wakatani: "Nonlinear Double Tearing Mode in Negative Shear Cylindrical Tokamaks"Journal of the Physical Society of Japan. 70, No. 9. 2578-2587 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Miyato, S. Hamaguchi and M. Wakatani: "Plasma current Effects on Unstable Resistive Drift-Alfven Modes in a Magnetized Cylindrical Plasma"Journal of the Physical Society of Japan. 70, No. 11. 3197-3200 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Unemura, S. Hamaguchi, and M. Wakatani: "Comparison between double-resonant and non-resonant mode driven conversions in a stellarator with a non-monotonic rotational transform"Journal of the Physical Society of Japan. 70, No.4. 983-987 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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