Effects of intermittency on turbulent transport in magnetized plasmas

Abstract

We analyze how the turbulent transport of $\mathbf{E}\times \mathbf{B}$ type in magnetically confined plasmas is affected by intermittent features of turbulence. The latter are captured by the non-Gaussian distribution $P(\varphi )$ of the turbulent electric potential $\varphi$. Our analysis is performed at an analytical level and confirmed numerically using two statistical approaches. We have found that the diffusion is inhibited linearly by intermittency, mainly via the kurtosis of the distribution $P(\varphi )$. The associated susceptibility for this linear process is shown to be dependent on the poloidal velocity $V_p$ and on the correlation time ${\tau }_c$ with a maxima at the time-of-flight ${\tau }_{fl}$. Intermittency does not affect the Kubo number scaling in the strong regime.

24 pages, 10 figures

References in corpus (4)

• Statistical analysis of Hasegawa - Wakatani turbulence
• Statistical properties of Charney-Hasegawa-Mima zonal flows
• Effects of the parallel acceleration on heavy impurity transport in turbulent tokamak plasmas
• Turbulent transport of fast ions in tokamak plasmas in the presence of resonant magnetic perturbations