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A continuum one-dimensional SOC model for thermal transport in tokamaks

Varun Tangri, Amita Das, Predhiman Kaw, Raghvendra Singh2003年被引用 6Nuclear FusionIF 3出版社

Based on the now well-known and experimentally observed critical gradient length (LTe) in tokamaks, we present a continuum one-dimensional model for explaining self organized heat transport in tokamaks. The key parameters of this model include a hysteresis parameter, which ensures that the switching of the heat transport coefficient χ upwards and downwards takes place at two different values of R/LTe. Extensive numerical simulations of this model reproduce many features of present day tokamaks, such as sub-marginal temperature profiles, intermittent transport events, 1/f scaling of the frequency spectra, propagating fronts, etc. This model utilizes a minimal set of phenomenological parameters, which may be determined from experiments and/or simulations. Analytical and physical understanding of the observed features has also been attempted.

日本語訳

トカマクにおける現在よく知られ、実験的に観測されている臨界勾配長(LTe)に基づき、トカマクにおける自己組織化熱輸送を説明するための連続体一次元モデルを提示する。このモデルの主要パラメータにはヒステリシスパラメータが含まれ、これにより熱輸送係数χの上方および下方への切り替えがR/LTeの二つの異なる値で生じることが保証される。このモデルの広範な数値シミュレーションは、準限界温度分布、間欠的輸送イベント、周波数スペクトルの1/fスケーリング、伝播フロントなど、現代のトカマクの多くの特徴を再現する。このモデルは、実験および/またはシミュレーションから決定され得る最小限の現象論的パラメータセットを利用する。観測された特徴の解析的および物理的理解も試みられている。

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