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Long Range Temperature Fluctuation in LHD

机译:LHD的远程温度波动

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We report a detailed correlation technique to identify the long-range temperature fluctuation in the Large Helical Device. Correlation hunting has successfully realized the observation of electron temperature fluctuations, which are characterized by their correlation length comparable to the plasma minor radius, with low frequency of ~ 1-3 kHz, ballistic radial propagation (at a speed of ~1 km/s, of the order of diamagnetic drift velocity), spatial mode number of m = 1/1 (or 2/1), and amplitude of ~2% at the maximum. Bicoherence analysis confirmed their nonlinear coupling with local microscopic turbulent fluctuations. This long-range temperature fluctuation is a possible carrier of fast propagation in transport processes observed so far. We also comment on the theoretical interpretation.
机译:我们报告了一种详细的关联技术,以识别大型螺旋设备中的远程温度波动。相关性搜寻已成功实现了对电子温度波动的观察,其特征在于其相关长度可与等离子短半径媲美,低频约为1-3 kHz,弹道径向传播(速度约为1 km / s, (反磁漂移速度的阶数),m / n的空间模数= 1/1(或2/1),且振幅最大为〜2%。双相干分析证实了它们与局部微观湍流波动的非线性耦合。这种远距离的温度波动可能是迄今为止观察到的运输过程中快速传播的可能载体。我们还对理论解释进行评论。

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