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首页> 外文期刊>Plasma physics and controlled fusion >Characterizing time intermittency in non-diffusive fast ion transport through plasma turbulence
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Characterizing time intermittency in non-diffusive fast ion transport through plasma turbulence

机译：通过等离子体湍流表征非扩散快速离子输送时间间歇性的时间间隔

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Turbulent fast ion transport has been investigated in astrophisycal, laboratory and fusion plasmas. When gyro- and drift-averaging across plasma structures manifest as non-markovian and non-local effects, this results in generally non-diffusive transport. The intermittency of the formation of these plasma structures, such as blobs, can potentially be reflected in the transport of the fast ions as well. In the TORPEX basic plasma device, a toroidal beam of suprathermal Li-6 ions is injected into electrostatic plasma turbulence. Conditional sampling techniques confirm turbulent E x B-drifts as physical driving mechanism of radial fast ion transport, which features sub-, super- or quasi-diffusive regimes depending on the fast ion energy and propagation time. To address the question of how far local intermittency is associated with each regime, we analyze characteristics of time-intermittency on an extensive set of local fast ion time-series across all observed regimes. Modeling the time-average fast ion profiles as the result of a meandering smaller instantaneous beam allows us to predict the skewness of such time-series based on their time-average. Comparisons with the skewness of simple two-valued time-series can yield relative indications towards certain transport regimes in our specific system, based on the differences in the size of the instantaneous fast ion beam.
机译：在天体性，实验室和融合等离子体中研究了湍流快速离子转运。当陀螺和漂移平均血浆结构表现为非马拉维亚和非局部效应时，这导致通常不扩散的运输。形成这些等离子体结构的间隔，例如斑点，也可以在快速离子的运输中反映。在Torpex基本等离子体器件中，将Suprathermal Li-6离子的环形束注入静电等离子体湍流中。条件采样技术确认湍流E X B漂移作为径向快速离子传输的物理驱动机制，其特征根据快速离子能量和传播时间来具有子，超级或准漫射状态。为了解决当地间歇性与每个制度相关的问题的问题，我们分析了所有观察到的制度的广泛局部快速离子时间系列的时间间歇性的特征。根据曲折较小的瞬时光束建模时平均快速离子轮廓允许我们基于它们的时间平均预测这种时间序列的偏斜度。基于瞬时快速离子束的尺寸的差异，具有简单的双值时间系列的歪曲的比较可以在我们的特定系统中产生对某些运输制度的相对指示。

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