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arXiv 2609.15125physics.plasm-ph

TCV中湍流的双长度空间相关函数

Two-length spatial correlation function of turbulence in TCV

  • Ecole Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院)
  • Laboratoire de Physique des Plasmas (LPP), CNRS, Sorbonne Université, Ecole polytechnique, Institut Polytechnique de Paris(等离子体物理实验室,法国国家科学研究中心,索邦大学,巴黎综合理工学院,巴黎理工学院)
  • CEA, IRFM(法国原子能和替代能源委员会,聚变研究国际中心)

机构由 AI 辅助整理,请以论文原文为准。

Olivier Panico, Pascale Hennequin, Sascha Rienäcker, Oleg Krutkin, Benoit Labit, Yanick Sarazin, the TCV team

AI总结:

本研究在TCV中利用双通道多普勒背向散射测量密度涨落空间相关函数,发现双长度尺度,可能指示雪崩输运,并量化了相关长度与加热功率的关系。

AI中文摘要:

在托卡马克可变配置装置(TCV)中,使用双通道多普勒背向散射(DBS)诊断测量了密度涨落的空间相关函数。在某些情况下,空间相关函数表现出两个特征长度尺度。通过与非线性约化模拟类比,两个相关长度的存在可能表明存在类似雪崩的输运。将DBS获得的相关函数与短脉冲反射计测量结果进行比较,显示出合理的一致性。在同一等离子体几何结构中,针对不同的加热功率测量了短程和长程相关性。发现短尺度相关长度约为3-5个拉莫尔半径,而大尺度相关性延伸约5-15个拉莫尔半径。在电子回旋加热放电的最边缘,相关性减弱,这与一个狭窄的Er阱相吻合。

英文摘要:

Spatial correlation functions of density fluctuations are measured in the Tokamak à Configuration Variable (TCV) using a dual-channel Doppler backscattering (DBS) diagnostic. In certain cases, the spatial correlation function exhibits two characteristic length scales. By analogy with nonlinear reduced simulations, the presence of two correlation lengths may be indicative of avalanche-like transport. The correlation functions obtained from DBS are compared with those from short-pulse reflectometry measurements and show reasonable agreement. Both short- and long-range correlations are measured in the same plasma geometry for different heating powers. Short-scale correlation lengths are found to be on the order of 3-5 Larmor radii, while large-scale correlations extend over approximately 5-15 Larmor radii. The correlations are found to decrease towards the very edge of electron cyclotron heated discharges, coinciding with a narrow Er well.

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