Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas
Abstract
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. Finally, the stochastic model thus provides a valuable tool for predicting fluctuation-induced plasma–wall interactions in magnetically confined fusion plasmas.
- Authors:
-
[1];
[1];
[1];
[2]
- UiT The Arctic Univ. of Norway, Tromsø (Norway). Dept. of Physics and Technology
- Massachusetts Inst. of Technology, Cambridge, MA (United States). Plasma Science and Fusion Center
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1540162
- Alternate Identifier(s):
- OSTI ID: 1427326
- Grant/Contract Number:
- FC02-99ER54512; FC02-99ER54512- CMOD
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; physics
Citation Formats
Garcia, O. E., Kube, R., Theodorsen, A., LaBombard, B., and Terry, J. L. Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas. United States: N. p., 2018.
Web. doi:10.1063/1.5018709.
Garcia, O. E., Kube, R., Theodorsen, A., LaBombard, B., & Terry, J. L. Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas. United States. https://doi.org/10.1063/1.5018709
Garcia, O. E., Kube, R., Theodorsen, A., LaBombard, B., and Terry, J. L. Sun .
"Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas". United States. https://doi.org/10.1063/1.5018709. https://www.osti.gov/servlets/purl/1540162.
@article{osti_1540162,
title = {Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas},
author = {Garcia, O. E. and Kube, R. and Theodorsen, A. and LaBombard, B. and Terry, J. L.},
abstractNote = {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. Finally, the stochastic model thus provides a valuable tool for predicting fluctuation-induced plasma–wall interactions in magnetically confined fusion plasmas.},
doi = {10.1063/1.5018709},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {Sun May 20 00:00:00 EDT 2018},
month = {Sun May 20 00:00:00 EDT 2018}
}
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On the relation between non-exponential Scrape Off Layer profiles and the dynamics of filaments
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- Theodorsen, A.; Garcia, O. E.; Kube, R.
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