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Investigations on Confinement Improvement by Supressing Microscopic Instabilities in Toroidal Plasmas

Investigations on Confinement Improvement by Supressing Microscopic Instabilities in Toroidal Plasmas
通过抑制环形等离子体中微观不稳定性来改善约束的研究
批准号:
02808003
负责人:
ITOH Kimitaka
金额:
$1.41万
依托单位国家:
日本
项目类别:
Grant-in-Aid for General Scientific Research (C)
财政年份:
1990
资助国家:
日本
项目状态:
已结题
起止时间:
1990 至 1991

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中文摘要
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英文摘要
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.
期刊论文(25)
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会议论文
A.J.Lichtenberg,K.Itoh,S.-I.Itoh and A.Fukuyama: "Role of Stochasticity in Sawtooth Oscillation" Nucl.Fusion. 32. (1992)
A.J.Lichtenberg、K.Itoh、S.-I.Itoh 和 A.Fukuyama:“随机性在锯齿振荡中的作用”Nucl.Fusion。
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通讯作者:
長崎 白伸: "Magnetic Field Stwcture near Plasma Boundary in Helical Systems and Diverfor Tokamaks" Japanese J.Apple Phys.29. 1336-1344 (1990)
Hakunobu Nagasaki:“螺旋系统和 Diverfor Tokamaks 中等离子体边界附近的磁场结构”Japan J.Apple Phys.29 (1990)。
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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)
Kazuo Toi:“边缘磁剪切对 JlPP T-IIU 托卡马克限制器 H 模式转变的作用”Phys Rev.Lett.64 (1990)。
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25
    Physics Modelling for Abrupt Events in Magnetized Plasmas
    Theoretical study of transport process in fusion ignition plasmas
    • 批准号:
      19360418
    • 项目类别:
      Grant-in-Aid for Scientific Research (B)
    • 资助金额:
      $10.9万
    • 财政年份:
      2007
    • 负责人:
      ITOH Kimitaka
    • 依托单位:
    Foundations for the theory of transport in thermonuclear fusion plasmas
    • 批准号:
      15360495
    • 项目类别:
      Grant-in-Aid for Scientific Research (B)
    • 资助金额:
      $8.51万
    • 财政年份:
      2003
    • 负责人:
      ITOH Kimitaka
    • 依托单位:
    Study of Improved Confinement in Helical Plasmas
    • 批准号:
      11680501
    • 项目类别:
      Grant-in-Aid for Scientific Research (C)
    • 资助金额:
      $2.37万
    • 财政年份:
      1999
    • 负责人:
      ITOH Kimitaka
    • 依托单位:
    海外基金