Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D
Abstract
Direct measurements of the pedestal recovery during an edge-localized mode cycle provide evidence that quasi-coherent fluctuations (QCFs) play a role in the inter-ELM pedestal dynamics. Using fast Thomson scattering measurements, the pedestal density and temperature evolutions are probed on sub-millisecond time scales to show a fast recovery of the density gradient compared to the temperature gradient. The temperature gradient appears to provide a drive for the onset of quasi-coherent fluctuations (as measured with the magnetic probe and the density diagnostics) localized in the pedestal. The amplitude evolution of these QCFs tracks the temperature gradient evolution including its saturation. Such correlation suggests that these QCFs play a key role in limiting the pedestal temperature gradient. The saturation of the QCFs coincides with the pressure gradient reaching the kinetic-ballooning mode (KBM) critical gradient as predicted by EPED1. Furthermore, linear microinstability analysis using GS2 indicates that the steep gradient is near the KBM threshold. Furthermore, the modeling and the observations together suggest that QCFs are consistent with dominant KBMs (although microtearing cannot be excluded as subdominant).
- Authors:
-
[1];
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Physics and Astronomy Dept., Los Angeles, CA (United States)
- Department of Engineering Physics, Madison, WI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1257720
- Alternate Identifier(s):
- OSTI ID: 1228241; OSTI ID: 1350064
- Report Number(s):
- PPPL-5096
Journal ID: ISSN 1070-664X; PHPAEN
- Grant/Contract Number:
- AC02-09CH11466; AC05-00OR22725; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; 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; Tokamaks; Turbulence; Edge Plasma; Gyrokinetic Equations
Citation Formats
Diallo, A., Groebner, R. J., Rhodes, T. L., Battaglia, D. J., Smith, D. R., Osborne, T. H., Canik, J. M., Guttenfelder, W., and Snyder, P. B. Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D. United States: N. p., 2015.
Web. doi:10.1063/1.4921148.
Diallo, A., Groebner, R. J., Rhodes, T. L., Battaglia, D. J., Smith, D. R., Osborne, T. H., Canik, J. M., Guttenfelder, W., & Snyder, P. B. Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D. United States. https://doi.org/10.1063/1.4921148
Diallo, A., Groebner, R. J., Rhodes, T. L., Battaglia, D. J., Smith, D. R., Osborne, T. H., Canik, J. M., Guttenfelder, W., and Snyder, P. B. Fri .
"Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D". United States. https://doi.org/10.1063/1.4921148. https://www.osti.gov/servlets/purl/1257720.
@article{osti_1257720,
title = {Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D},
author = {Diallo, A. and Groebner, R. J. and Rhodes, T. L. and Battaglia, D. J. and Smith, D. R. and Osborne, T. H. and Canik, J. M. and Guttenfelder, W. and Snyder, P. B.},
abstractNote = {Direct measurements of the pedestal recovery during an edge-localized mode cycle provide evidence that quasi-coherent fluctuations (QCFs) play a role in the inter-ELM pedestal dynamics. Using fast Thomson scattering measurements, the pedestal density and temperature evolutions are probed on sub-millisecond time scales to show a fast recovery of the density gradient compared to the temperature gradient. The temperature gradient appears to provide a drive for the onset of quasi-coherent fluctuations (as measured with the magnetic probe and the density diagnostics) localized in the pedestal. The amplitude evolution of these QCFs tracks the temperature gradient evolution including its saturation. Such correlation suggests that these QCFs play a key role in limiting the pedestal temperature gradient. The saturation of the QCFs coincides with the pressure gradient reaching the kinetic-ballooning mode (KBM) critical gradient as predicted by EPED1. Furthermore, linear microinstability analysis using GS2 indicates that the steep gradient is near the KBM threshold. Furthermore, the modeling and the observations together suggest that QCFs are consistent with dominant KBMs (although microtearing cannot be excluded as subdominant).},
doi = {10.1063/1.4921148},
journal = {Physics of Plasmas},
number = 5,
volume = 22,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2015},
month = {Fri May 15 00:00:00 EDT 2015}
}
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