Dynamic behavior of structure trnsition phenomena in nonequilibrium and nonlinear plasmas in open systems

开放系统中非平衡和非线性等离子体结构转变现象的动态行为

基本信息

  • 批准号:
    11837021
  • 负责人:
  • 金额:
    $ 2.3万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1999
  • 资助国家:
    日本
  • 起止时间:
    1999 至 2001
  • 项目状态:
    已结题

项目摘要

Nonlinear MHD simulations on relaxation phenomena in spherical tokamak and helical plasmas, including 3D HINT equilibrium computations, are executed. The dynamics of global relaxation phenomena in spherical tokamak have been revealed. We analyze the sawtooth and the internal reconnection event (IRE). For the sawtooth case, a new nonlinear trigger mechanism is found, in which the n=1 activity in the core region is subsequently excited by development of higher n ballooning modes in the periphery region. After a process of pressure collapse, the torus returns to a state close to the axisymmetric initial configuration but with a broader pressure profile. The overall shape of the torus surface does not change throughout the event. On the other hand, simulations for IRE show a large distortion of the torus. The differences arise from only slight discrepancies in the initial profiles. The 3D equilibrium code HINT, which does not assume the existence of magnetic surfaces, is modified in a couple of directions to extend the functions. A new MHD simulation code for a full three dimensional geometry of helical plasmas were developed. A relaxation phenomenon driven by pressure driven instabilities in the LHD configuration was observed, which was not destructive but caused transition to a new equilibrium. An initial phase of plasma deformations is dominated by medium-n resistive ballooning instability. In the later stage, a well-confined state is recovered by having spontaneous evolution to a broader pressure profile. Virtual reality display system was developed as an advanced visualization method to understand complex phenomena.
对球形托卡马克和螺旋等离子体中的弛豫现象进行了非线性MHD模拟,包括三维HINT平衡计算。揭示了球形托卡马克中全局弛豫现象的动力学机制。我们分析了内重联事件和内重联事件(IRE)。对于非线性的情况下,一个新的非线性触发机制被发现,其中在核心区域的n=1的活动随后被激发的发展在外围区域的高n气球模式。在压力崩溃过程之后,环面返回到接近于轴对称初始构型的状态,但具有更宽的压力分布。圆环曲面的整体形状在整个事件中不会更改。另一方面,IRE的模拟显示了环面的大失真。这些差异仅仅是由于初始轮廓中的微小差异造成的。三维平衡程序HINT没有假设磁表面的存在,在几个方向上进行了修改,以扩展功能。开发了一个新的三维螺旋等离子体MHD模拟程序。在LHD位形中观察到由压力驱动的不稳定性驱动的弛豫现象,该弛豫现象不是破坏性的,而是引起向新平衡的转变。等离子体变形的初始阶段主要是由中等n电阻气球不稳定性。在后期阶段,通过自发演化到更宽的压力分布来恢复良好的封闭状态。虚拟现实显示系统作为一种先进的可视化手段被开发出来,以理解复杂的现象。

项目成果

期刊论文数量(33)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hayashi Takaya: "Recent progress in simulation study of magnetically confined plasmas"Journal of Plasma and Fusion Research. 77-6. 521-524 (2001)
Hayashi Takaya:“磁约束等离子体模拟研究的最新进展”等离子体与聚变研究杂志。
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    0
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  • 通讯作者:
Hayashi Takaya: "Dynamics of Relaxation Phenomena in Spherical Tokamak"Fusion Energy. (In print). (2001)
Hayashi Takaya:“球形托卡马克中弛豫现象的动力学”聚变能。
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    0
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Takaya Hayashi: "Relaxation phenomena in spherical tokamak"Progress of Theoretical Physics. (In press). (2000)
Takaya Hayashi:“球形托卡马克中的弛豫现象”理论物理进展。
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    0
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Naoki Mizuguchi: "Dynamics of Spherical Tokamak Plasma on Internal Reconnection Event"Physics of Plasmas. 7, 3. 940-949 (2000)
Naoki Mizuguchi:“球形托卡马克等离子体内部重联事件的动力学”等离子体物理学。
  • DOI:
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  • 影响因子:
    0
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  • 通讯作者:
Miura Hideaki: "Nonlinear simulation of resistive ballooning modes in Large Helical Device"Physics of Plasmas. 8-11. 4870-4878 (2001)
Miura Hideaki:“大型螺旋装置中电阻气球模式的非线性模拟”等离子体物理学。
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    0
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HAYASHI Takaya其他文献

A novel regulatory role for TRAF2 and TRAF5 in the IL-6-driven Th17 development.
TRAF2 和 TRAF5 在 IL-6 驱动的 Th17 发育中的新调节作用。
  • DOI:
  • 发表时间:
    2017
  • 期刊:
  • 影响因子:
    0
  • 作者:
    NAGASHIMA Hiroyuki;OKUYAMA Yuko;HAYASHI Takaya;ISHII Naoto;SO Takanori
  • 通讯作者:
    SO Takanori
Can Relaxation Events and Stability be Problems?
松弛事件和稳定性会成为问题吗?

HAYASHI Takaya的其他文献

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{{ truncateString('HAYASHI Takaya', 18)}}的其他基金

Comparison of confinement physiscs for toroidal plasmas
环形等离子体的约束物理比较
  • 批准号:
    11695035
  • 财政年份:
    1999
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Comparative Study of Confinement Physics in Toroidal Plasmas
环形等离子体中约束物理的比较研究
  • 批准号:
    08045027
  • 财政年份:
    1996
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for international Scientific Research
HIGH SPEED PARALLEL COMPUTATION OF THREE-DIMENSIONAL EQUILIBRIUM AND STABILITY FOR NONAXISYMMETRIC TORUS PLASMAS
非轴对称环面等离子体三维平衡和稳定性的高速并行计算
  • 批准号:
    05680403
  • 财政年份:
    1993
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
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