离子流到JET外壁的普适性
Universality of the ion flux to the JET outer wall
摘要：
在外壁限制器安装朗缪尔探针（OLP）的时间序列中观察到的离子通量的JET外壁的普遍性在大范围的等离子体电流和线平均密度在欧姆加热的水平目标L-模式等离子体。由OLP测量的离子饱和电流的平均值M和标准差σ显示出随等离子体电流和密度的系统变化。两者都随着等离子体电流减小和/或密度增加而增加。在通过减去M和通过sigma重新缩放实现的重正化之后，每个信号的概率分布函数（PDF）近似地塌陷到单个曲线上。曲线的形状偏离PDF尾部的分布，并且更好地由对数正态分布描述。崩溃发生在纵坐标的40年，考虑到数据跨越的宽参数空间，这是普遍性的强烈迹象。
英文摘要：
Universality in the ion flux to the JET outer-wall is observed in outerwall limiter mounted Langmuir probe (OLP) time-series across a large range of plasma current and line-averaged density during Ohmically heated horizontal target L-mode plasmas. The mean, M, and the standard deviation, sigma, of the ion-saturation current measured by the OLP show systematic variation with plasma current and density. Both increase as either plasma current decreases and/or density increases. Upon renormalization, achieved by subtraction of M and rescaling by sigma, the probability distribution functions (PDFs) of each signal collapse approximately onto a single curve. The shape of the curve deviates from a distribution in the tail of the PDF and is better described by a log-normal distribution. The collapse occurs over 4 decades of the ordinate which, given the wide parameter space over which the data spans, is a strong indication of universality.
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