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Density fluctuation of geodesic acoustic mode on the HL-2A tokamak

机译：HL-2A托卡马克上测地声模的密度波动

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摘要

The density fluctuations of the geodesic acoustic mode (GAM) have been observed in Ohmic deuterium plasma discharges with a combination of rake-like and three-step Langmuir probe arrays on the HL-2A tokamak. The probe arrays with poloidal and toroidal separations of 36 and 1330 mm are applied to measure the spectral property and intermittency of the GAM density fluctuations. The poloidal and toroidal mode numbers of the fluctuations are simultaneously measured for the first time. The measured fluctuation amplitude is consistent with the theoretical prediction. High coherence and near zero phase shift of the GAM density fluctuations separated toroidally by 37.5° at the same magnetic flux surface was first observed, indicating the symmetric structure of the GAM in the toroidal direction. The peak time delays of the cross-correlation function of the fluctuations above and below the midplane suggest the expected sin θ dependence. The nonlinear three wave coupling between the GAM and the ambient turbulence is shown to be a plausible mechanism for the generation of the GAM density fluctuations. The significant coherence and the corresponding fixed phase shift (～π) between the original data and the envelope of the high frequency ambient turbulence provide the experimental evidence for the envelope modulation. The GAM amplitude is out of phase with the particle flux. Most of the intermittent frequencies for particle flux are close to the GAM frequency.
机译：在HL-2A托卡马克上结合了耙状和三步Langmuir探针阵列，在欧姆氘氘等离子体放电中观察到了测地声模（GAM）的密度波动。极性和环形间距分别为36和1330 mm的探针阵列用于测量GAM密度波动的光谱特性和间歇性。第一次同时测量波动的极坐标和环形模数。测得的波动幅度与理论预测一致。在同一磁通量表面上，首先观察到GAM密度波动的高相干性和接近零相移，其环面相距37.5°，表明GAM在环面方向上呈对称结构。中平面上方和下方波动的互相关函数的峰值时间延迟表明了预期的sinθ依赖性。 GAM和环境湍流之间的非线性三波耦合被证明是产生GAM密度波动的合理机制。原始数据与高频环境湍流的包络线之间的显着相干和相应的固定相移（〜π）为包络调制提供了实验证据。 GAM振幅与粒子通量异相。粒子通量的大多数间歇频率都接近GAM频率。

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  • 来源
    《Nuclear fusion》 |2009年第8期|287-298|共12页
  • 作者

    J. Cheng; L.W. Yan; K.J. Zhao; J.Q. Dong; W.Y. Hong; J. Qian; Q.W. Yang; X.T. Ding; X.R. Duan; Y. Liu;

  • 作者单位

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

    Southwestern Institute of Physics, P O Box 432, Chengdu 610041,People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    plasma turbulence; transport properties; nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.); tokamaks, spherical tokamaks;

    机译：等离子体湍流运输特性;非线性现象：波;波传播和其他相互作用（包括参数效应;模式耦合;质动力效应等）;托卡马克;球形托卡马克;

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