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Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas

Permanent lenke
https://hdl.handle.net/10037/14831
DOI
https://doi.org/10.1063/1.5018709
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article.pdf (1.134Mb)
Accepted manuscript version (PDF)
Dato
2018-03-20
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Garcia, Odd Erik; Kube, Ralph; Theodorsen, Audun; Labombard, B; Terry, J.L
Sammendrag
Plasma fluctuations in the scrape-off layer of the Alcator C-Mod tokamak in ohmic and high confinement modes have been analyzed using gas puff imaging data. In all cases investigated, the time series of emission from a single spatially resolved view into the gas puff are dominated by large-amplitude bursts, attributed to blob-like filament structures moving radially outwards and poloidally. There is a remarkable similarity of the fluctuation statistics in ohmic plasmas and in edge localized mode-free and enhanced D-alpha high confinement mode plasmas. Conditionally averaged waveforms have a two-sided exponential shape with comparable temporal scales and asymmetry, while the burst amplitudes and the waiting times between them are exponentially distributed. The probability density functions and the frequency power spectral densities are similar for all these confinement modes. These results provide strong evidence in support of a stochastic model describing the plasma fluctuations in the scrape-off layer as a super-position of uncorrelated exponential pulses. Predictions of this model are in excellent agreement with experimental measurements in both ohmic and high confinement mode plasmas. The stochastic model thus provides a valuable tool for predicting fluctuation-induced plasma–wall interactions in magnetically confined fusion plasmas.
Beskrivelse
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Garcia, O. E., Kube, R., Theodorsen, A., Labombard, B. & Terry, J. (2018). Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas. Physics of Plasmas, 25(5), and may be found at http://doi.org/10.1063/1.5018709
Forlag
AIP
Sitering
Garcia, O. E., Kube, R., Theodorsen, A., Labombard, B. & Terry, J. (2018). Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas. Physics of Plasmas, 25(5). http://doi.org/10.1063/1.5018709
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