Theory based scaling of edge turbulence and implications for the scrape-off layer width
Abstract
Turbulence and plasma parameter data from the National Spherical Torus Experiment NSTX [M. Ono, S.M. Kaye, Y.-K.M. Peng, G. Barnes et al., Nucl. Fusion 40, 557 (2000)] is examined and interpreted based on various theoretical estimates. In particular, quantities of interest for assessing the role of turbulent transport on the midplane scrape-off layer heat flux width are assessed. Because most turbulence quantities exhibit large scatter and little scaling within a given operation mode, this paper focuses on length and time scales and dimensionless parameters between operational modes including Ohmic, low (L), and high (H) modes using a large NSTX edge turbulence database [S.J. Zweben, W.M. Davis, S.M. Kaye, J.R. Myra et al., Nucl. Fusion 55, 093035 (2015)]. These are compared with theoretical estimates for drift and interchange rates, profile modification saturation levels, a resistive ballooning condition, and dimensionless parameters characterizing L and high H mode conditions. It is argued that the underlying instability physics governing edge turbulence in different operational modes is in fact similar, and is consistent with curvature-driven drift- ballooning. Saturation physics, however, is dependent on the operational mode. Five dimensionless parameters for drift-interchange turbulence are obtained and employed to assess the important of turbulence in setting themore »
- Authors:
-
[1];
[1];
[2]
- Lodestar Research Corp., Boulder, CO (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lodestar Research Corp., Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Contributing Org.:
- Lodestar Res Corp, 2400 Cent Ave, Boulder, CO 80301 USA.
- OSTI Identifier:
- 1340279
- Alternate Identifier(s):
- OSTI ID: 1330725; OSTI ID: 1358115
- Report Number(s):
- DOE-ER/54392-82; LRC-16-166
Journal ID: ISSN 1070-664X; TRN: US1701299
- Grant/Contract Number:
- AC02-09CH11466; FG02-02ER54678; FG02-97ER54392
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 11; 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; x-point; transition; transport; geometry; modes; edge turbulence, tokamak, drift-interchange, heat flux width
Citation Formats
Myra, J. R., Russell, D. A., and Zweben, S. J. Theory based scaling of edge turbulence and implications for the scrape-off layer width. United States: N. p., 2016.
Web. doi:10.1063/1.4966564.
Myra, J. R., Russell, D. A., & Zweben, S. J. Theory based scaling of edge turbulence and implications for the scrape-off layer width. United States. https://doi.org/10.1063/1.4966564
Myra, J. R., Russell, D. A., and Zweben, S. J. Tue .
"Theory based scaling of edge turbulence and implications for the scrape-off layer width". United States. https://doi.org/10.1063/1.4966564. https://www.osti.gov/servlets/purl/1340279.
@article{osti_1340279,
title = {Theory based scaling of edge turbulence and implications for the scrape-off layer width},
author = {Myra, J. R. and Russell, D. A. and Zweben, S. J.},
abstractNote = {Turbulence and plasma parameter data from the National Spherical Torus Experiment NSTX [M. Ono, S.M. Kaye, Y.-K.M. Peng, G. Barnes et al., Nucl. Fusion 40, 557 (2000)] is examined and interpreted based on various theoretical estimates. In particular, quantities of interest for assessing the role of turbulent transport on the midplane scrape-off layer heat flux width are assessed. Because most turbulence quantities exhibit large scatter and little scaling within a given operation mode, this paper focuses on length and time scales and dimensionless parameters between operational modes including Ohmic, low (L), and high (H) modes using a large NSTX edge turbulence database [S.J. Zweben, W.M. Davis, S.M. Kaye, J.R. Myra et al., Nucl. Fusion 55, 093035 (2015)]. These are compared with theoretical estimates for drift and interchange rates, profile modification saturation levels, a resistive ballooning condition, and dimensionless parameters characterizing L and high H mode conditions. It is argued that the underlying instability physics governing edge turbulence in different operational modes is in fact similar, and is consistent with curvature-driven drift- ballooning. Saturation physics, however, is dependent on the operational mode. Five dimensionless parameters for drift-interchange turbulence are obtained and employed to assess the important of turbulence in setting the scrapeoff layer heat flux width lambda_q and its scaling. An explicit proportionality of the width lambda_q to safety factor and major radius (qR) is obtained under these conditions. Quantitative estimates and reduced model numerical simulations suggest that the turbulence mechanism is not negligible in determining lambda_q in NSTX, at least for high plasma current discharges.},
doi = {10.1063/1.4966564},
journal = {Physics of Plasmas},
number = 11,
volume = 23,
place = {United States},
year = {Tue Nov 01 00:00:00 EDT 2016},
month = {Tue Nov 01 00:00:00 EDT 2016}
}
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Theory based scaling of edge turbulence and implications for the scrape-off layer width
dataset, January 2016
- Myra, J. R.; Russell, D. A.; Zweben, S. J.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Theory based scaling of edge turbulence and implications for the scrape-off layer width
dataset, January 2016
- Myra, J.; Russell, D.; Zweben, S.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Theory based scaling of edge turbulence and implications for the scrape-off layer width
dataset, January 2016
- Myra, J.; Russell, D.; Zweben, S.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
An experimental investigation on the high density transition of the Scrape-off Layer transport in ASDEX Upgrade
text, January 2014
- Carralero, D.; Birkenmeier, G.; Müller, H. W.
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Theory based scaling of edge turbulence and implications for the scrape-off layer width
dataset, January 2016
- Myra, J. R.; Russell, D. A.; Zweben, S. J.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Works referencing / citing this record:
Blob-hole correlation model for edge turbulence and comparisons with NSTX gas puff imaging data
journal, June 2018
- Myra, J. R.; Zweben, S. J.; Russell, D. A.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 7
High-resolution heat flux width measurements at reactor-level magnetic fields and observation of a unified width scaling across confinement regimes in the Alcator C-Mod tokamak
journal, July 2018
- Brunner, D.; LaBombard, B.; Kuang, A. Q.
- Nuclear Fusion, Vol. 58, Issue 9
Divertor leg filaments in NSTX-U
journal, October 2018
- Scotti, Filippo; Zweben, Stewart; Soukhanovskii, Vlad
- Nuclear Fusion, Vol. 58, Issue 12
Theory based scaling of edge turbulence and implications for the scrape-off layer width
dataset, January 2016
- Myra, J. R.; Russell, D. A.; Zweben, S. J.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Theory based scaling of edge turbulence and implications for the scrape-off layer width
dataset, January 2016
- Myra, J.; Russell, D.; Zweben, S.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data]
dataset, April 2018
- Charidakos, Ioannis Keramidas; Myra, James; Parker, Scott
- Zenodo-Supplementary information for journal article at DOI: 10.1063/1.5037723, 15 files (333.7 kB)
Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation
journal, July 2018
- Keramidas Charidakos, I.; Myra, J. R.; Parker, S.
- Physics of Plasmas, Vol. 25, Issue 7
Analysis Of Equilibrium And Turbulent Fluxes Across The Separatrix In A Gyrokinetic Simulation [Supplementary Data]
dataset, April 2018
- Charidakos, Ioannis Keramidas; Myra, James; Parker, Scott
- Zenodo-Supplementary information for journal article at DOI: 10.1063/1.5037723, 15 files (333.7 kB)
Analysis of equilibrium and turbulent fluxes across the separatrix in a gyrokinetic simulation
text, January 2018
- Charidakos, I. Keramidas; Myra, J. R.; Parker, S.
- arXiv