TY  - JOUR
AU  - Rajković, Milan
AU  - Watanabe, Tomo-Hiko
AU  - Škorić, Miloš M.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3772
AB  - The amplitude variability of the confined fusion plasma turbulence is neglected in order to study solely its zero-crossing information. The retained zero-crossing set enables insight into various aspects of edge plasma turbulence. Certain common features with neutral fluid turbulence are recognized in the low confinement regime (L-mode). Spectral characteristics of the zero-crossing set are compared between L-mode, dithering H-mode and H-mode plasma edge turbulence and a scaling exponent characterizing the tendency of small scales to cluster is introduced. A transformation invariant level-crossing function is shown to be a more reliable indicator of stable equilibrium states than the probability density function. In particular the zero-crossing function detects L-H transitions and recognizes edge localized modes as catastrophic events in the sense of stochastic catastrophe theory. The method may be of significant importance in the analysis and control of edge plasma trubulence.
T2  - Nuclear Fusion
T1  - Level-crossing function in the analysis of edge plasma turbulence
VL  - 49
IS  - 9
DO  - 10.1088/0029-5515/49/9/095016
ER  - 

@article{
author = "Rajković, Milan and Watanabe, Tomo-Hiko and Škorić, Miloš M.",
year = "2009",
abstract = "The amplitude variability of the confined fusion plasma turbulence is neglected in order to study solely its zero-crossing information. The retained zero-crossing set enables insight into various aspects of edge plasma turbulence. Certain common features with neutral fluid turbulence are recognized in the low confinement regime (L-mode). Spectral characteristics of the zero-crossing set are compared between L-mode, dithering H-mode and H-mode plasma edge turbulence and a scaling exponent characterizing the tendency of small scales to cluster is introduced. A transformation invariant level-crossing function is shown to be a more reliable indicator of stable equilibrium states than the probability density function. In particular the zero-crossing function detects L-H transitions and recognizes edge localized modes as catastrophic events in the sense of stochastic catastrophe theory. The method may be of significant importance in the analysis and control of edge plasma trubulence.",
journal = "Nuclear Fusion",
title = "Level-crossing function in the analysis of edge plasma turbulence",
volume = "49",
number = "9",
doi = "10.1088/0029-5515/49/9/095016"
}

Rajković, M., Watanabe, T.,& Škorić, M. M.. (2009). Level-crossing function in the analysis of edge plasma turbulence. in Nuclear Fusion, 49(9).
https://doi.org/10.1088/0029-5515/49/9/095016

Rajković M, Watanabe T, Škorić MM. Level-crossing function in the analysis of edge plasma turbulence. in Nuclear Fusion. 2009;49(9).
doi:10.1088/0029-5515/49/9/095016 .

Rajković, Milan, Watanabe, Tomo-Hiko, Škorić, Miloš M., "Level-crossing function in the analysis of edge plasma turbulence" in Nuclear Fusion, 49, no. 9 (2009),
https://doi.org/10.1088/0029-5515/49/9/095016 . .

TY  - JOUR
AU  - Rajković, Milan
AU  - Watanabe, Tomo-Hiko
AU  - Škorić, Miloš M.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3796
AB  - Effects of multihelicity confinement magnetic fields on turbulent transport and zonal flows are investigated by means of spatiotemporal analysis of gyrokinetic Vlasov simulation results for the ion temperature gradient turbulence, where the standard and the inward-shifted configurations of the Large Helical Device are considered. The analysis of simulation results demonstrates that fluctuations of electrostatic potential for zonal flows exhibit spatiotemporal chaos in both configurations. However, the intensity of chaos found is considerably decreased in the inward-shifted configuration consistent with improved confinement. Enhanced zonal flow generation in the inward shifted case is accompanied by transport reduction which may be a direct consequence of chaos suppression. (C) 2009 American Institute of Physics. [doi:10.1063/1.3237133]
T2  - Physics of Plasmas
T1  - Spatiotemporal dynamics and transport reduction in helical magnetic configuration
VL  - 16
IS  - 9
DO  - 10.1063/1.3237133
ER  - 

@article{
author = "Rajković, Milan and Watanabe, Tomo-Hiko and Škorić, Miloš M.",
year = "2009",
abstract = "Effects of multihelicity confinement magnetic fields on turbulent transport and zonal flows are investigated by means of spatiotemporal analysis of gyrokinetic Vlasov simulation results for the ion temperature gradient turbulence, where the standard and the inward-shifted configurations of the Large Helical Device are considered. The analysis of simulation results demonstrates that fluctuations of electrostatic potential for zonal flows exhibit spatiotemporal chaos in both configurations. However, the intensity of chaos found is considerably decreased in the inward-shifted configuration consistent with improved confinement. Enhanced zonal flow generation in the inward shifted case is accompanied by transport reduction which may be a direct consequence of chaos suppression. (C) 2009 American Institute of Physics. [doi:10.1063/1.3237133]",
journal = "Physics of Plasmas",
title = "Spatiotemporal dynamics and transport reduction in helical magnetic configuration",
volume = "16",
number = "9",
doi = "10.1063/1.3237133"
}

Rajković, M., Watanabe, T.,& Škorić, M. M.. (2009). Spatiotemporal dynamics and transport reduction in helical magnetic configuration. in Physics of Plasmas, 16(9).
https://doi.org/10.1063/1.3237133

Rajković M, Watanabe T, Škorić MM. Spatiotemporal dynamics and transport reduction in helical magnetic configuration. in Physics of Plasmas. 2009;16(9).
doi:10.1063/1.3237133 .

Rajković, Milan, Watanabe, Tomo-Hiko, Škorić, Miloš M., "Spatiotemporal dynamics and transport reduction in helical magnetic configuration" in Physics of Plasmas, 16, no. 9 (2009),
https://doi.org/10.1063/1.3237133 . .