Abstract

Experiments on Experimental Advanced Superconducting Tokamak (EAST) were performed with high normalized beta (\({{\beta }_{N}}\sim 1.9\)) and favorable energy confinement (\({{H}_{{98,y2}}}\sim 1.1\)) for the operating space achieved in EAST. Gyrokinetic simulations were carried out for four different \({{\beta }_{N}}\) cases with the experimental plasma parameters and tokamak equilibrium data. It was found that the favorable confinement is effectively maintained when \({{\beta }_{N}}\) increases to 1.9. The radial distribution of potential fluctuation during turbulence saturation phase is consistent with that of thermal transport diffusivity. Turbulence with higher toroidal modes becomes important as \({{\beta }_{N}}\) increases, and zonal flow shearing rate suppresses the turbulence when \({{\beta }_{N}}\) increases to 1.9, which is responsible for the well-maintained confinement.

中文翻译：

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实验先进超导托卡马克在高βN放电中的湍流动力学模拟。

摘要

在实验高级超导托卡马克（EAST）上进行了高归一化的beta（\（{{beta} _ {N}} \ sim 1.9 \））和良好的能量限制（\（{{H} _ {{98， y2}}} \ sim 1.1 \））以获取在EAST中获得的操作空间。Gyrokinetic模拟，对于四个不同的实施\（{{\的β} _ {N}} \）的情况下与实验等离子体参数和托卡马克平衡数据。发现当\（{{\ beta} _ {N}} \）增加到1.9时，可以有效地保持有利的限制。湍流饱和阶段势能波动的径向分布与热输运扩散率一致。具有较高环形模式的湍流对于\（{{\ beta} _ {N}} \\当\（{{{beta} _ {N}} \）增加到1.9时，区域流动剪切速率将抑制湍流，这是保持良好约束的原因。