Probability of statistical L-H transition in tokamaks.
Probability of statistical L-H transition in tokamaks.
复制标题
托卡马克中统计 L-H 转变的概率。
DOI：
10.1103/physrevlett.89.215001
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发表时间：
2002
影响因子：
8.6
通讯作者：
S. Toda
中科院分区：
文献类型：
--
作者：
S. Itoh;K. Itoh;S. Toda
为了描述托克马克等离子体的L-H跃迁，分析了径向电场Er分岔的统计模型。微波动中的噪声被证明是导致随机变化的Er，如果一个确定性的方法允许一个以上的解决方案。得到了Er的几率密度函数和系综平均。计算了L-H和H-L跃迁几率，并导出了有效相限。由于Er中剪切对湍流的抑制，该极限偏离了麦克斯韦规则。
A statistical model for the bifurcation of the radial electric field Er is analyzed in view of describing L-H transitions of tokamak plasmas. Noise in microfluctuations is shown to lead to random changes of Er if a deterministic approach allows for more than one solution. The probability density function for and the ensemble average of Er are obtained. The L-to-H and the H-to-L transition probabilities are calculated, and the effective phase limit is derived. Because of the suppression of turbulence by shear in Er, the limit deviates from Maxwell's rule.