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arXiv physics/0606259physics.plasm-ph
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充气成像RFX-mod中边缘turbulence的统计特征

Statistical features of edge turbulence in RFX-mod from Gas Puffing Imaging

F. Sattin, P. Scarin, M. Agostini, R. Cavazzana, G. Serianni, M. Spolaore, N. Vianello

摘要:

RFX-mod设备边缘等离子体中的等离子体密度波动通过气体抽吸成像诊断进行测量。信号的统计特征量化的概率分布函数(PDF),并计算几种放电。发现来自没有特定控制方法的放电的PDF由伽马函数充分描述,与Graves等人的最近结果一致[J. P. Graves等人,Plasma Phys. Control. Fusion 47,L1(2005)]。另一方面,用于等离子体控制的外部方法的脉冲具有修改的PDF。第一个实证分析表明,它们可以通过简单函数的线性组合进行插值。文献的检查表明,这种PDF是常见的其他设备,以及,并已被建议是由于同时存在不同的机制,分别驱动相干爆发和高斯背景湍流。尝试将PDF中的差异与血浆条件(诸如血浆柱的局部移位)相关联。一个简单的唯象模型来解释PDF的性质,并赋予其参数的意义。

英文摘要:

Plasma density fluctuations in the edge plasma of the RFX-mod device are measured through the Gas Puffing Imaging Diagnostics. Statistical features of the signal are quantified in terms of the Probability Distribution Function (PDF), and computed for several kinds of discharges. The PDFs from discharges without particular control methods are found to be adequately described by a Gamma function, consistently with the recent results by Graves et al [J.P. Graves, et al, Plasma Phys. Control. Fusion 47, L1 (2005)]. On the other hand, pulses with external methods for plasma control feature modified PDFs. A first empirical analysis suggests that they may be interpolated through a linear combination of simple functions. An inspection of the literature shows that this kind of PDFs is common to other devices as well, and has been suggested to be due to the simultaneous presence of different mechanisms driving respectively coherent bursts and gaussian background turbulence. An attempt is made to relate differences in the PDFs to plasma conditions such as the local shift of the plasma column. A simple phenomenological model to interpret the nature of the PDF and assign a meaning to its parameters is also developed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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