Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
Abstract
Linear (local) gyrokinetic predictions of edge microinstabilities in highly shaped, lithiated and non-lithiated NSTX discharges are reported using the gyrokinetic code GS2. Microtearing modes dominate the non-lithiated pedestal top. The stabilization of these modes at the lithiated pedestal top enables the electron temperature pedestal to extend further inwards, as observed experimentally. Kinetic ballooning modes are found to be unstable mainly at the mid-pedestal of both types of discharges, with un- stable trapped electron modes nearer the separatrix region. At electron wavelengths, ETG modes are found to be unstable from mid-pedestal outwards for ηe, exp ~2.2 with higher growth rates for the lithiated discharge. Near the separatrix, the critical temperature gradient for driving ETG modes is reduced in the presence of lithium, re ecting the reduction of the lithiated density gradients observed experimentally. A preliminary linear study in the edge of non-lithiated discharges shows that the equilibrium shaping alters the electrostatic modes stability, found more unstable at high plasma shaping.
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- NSTX-U team
- OSTI Identifier:
- 1273406
- Alternate Identifier(s):
- OSTI ID: 1259972
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 6; 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; Lithium; Microinstabilities; Plasma gyrokinetics
Citation Formats
Coury, M., Guttenfelder, W., Mikkelsen, D. R., Canik, J. M., Canal, G. P., Diallo, A., Kaye, S., Kramer, G. J., and Maingi, R. Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry. United States: N. p., 2016.
Web. doi:10.1063/1.4954911.
Coury, M., Guttenfelder, W., Mikkelsen, D. R., Canik, J. M., Canal, G. P., Diallo, A., Kaye, S., Kramer, G. J., & Maingi, R. Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry. United States. https://doi.org/10.1063/1.4954911
Coury, M., Guttenfelder, W., Mikkelsen, D. R., Canik, J. M., Canal, G. P., Diallo, A., Kaye, S., Kramer, G. J., and Maingi, R. Thu .
"Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry". United States. https://doi.org/10.1063/1.4954911. https://www.osti.gov/servlets/purl/1273406.
@article{osti_1273406,
title = {Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry},
author = {Coury, M. and Guttenfelder, W. and Mikkelsen, D. R. and Canik, J. M. and Canal, G. P. and Diallo, A. and Kaye, S. and Kramer, G. J. and Maingi, R.},
abstractNote = {Linear (local) gyrokinetic predictions of edge microinstabilities in highly shaped, lithiated and non-lithiated NSTX discharges are reported using the gyrokinetic code GS2. Microtearing modes dominate the non-lithiated pedestal top. The stabilization of these modes at the lithiated pedestal top enables the electron temperature pedestal to extend further inwards, as observed experimentally. Kinetic ballooning modes are found to be unstable mainly at the mid-pedestal of both types of discharges, with un- stable trapped electron modes nearer the separatrix region. At electron wavelengths, ETG modes are found to be unstable from mid-pedestal outwards for ηe, exp ~2.2 with higher growth rates for the lithiated discharge. Near the separatrix, the critical temperature gradient for driving ETG modes is reduced in the presence of lithium, re ecting the reduction of the lithiated density gradients observed experimentally. A preliminary linear study in the edge of non-lithiated discharges shows that the equilibrium shaping alters the electrostatic modes stability, found more unstable at high plasma shaping.},
doi = {10.1063/1.4954911},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = {Thu Jun 30 00:00:00 EDT 2016},
month = {Thu Jun 30 00:00:00 EDT 2016}
}
Web of Science
Figures / Tables:
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Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016
- Coury, M.; Guttenfelder, W.; Mikkelsen, D.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016
- Coury, M.; Guttenfelder, W.; Mikkelsen, D.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016
- Coury, M.; Guttenfelder, W.; Mikkelsen, D.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Simulating Gyrokinetic Microinstabilities in Stellarator Geometry with GS2
text, January 2011
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Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016
- Coury, M.; Guttenfelder, W.; Mikkelsen, D.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Works referencing / citing this record:
Blob wakes in NSTX
journal, July 2019
- Zweben, S. J.; Myra, J. R.; Diallo, A.
- Physics of Plasmas, Vol. 26, Issue 7
Effects of divertor geometry on H-mode pedestal structure in attached and detached plasmas in the DIII-D tokamak
journal, July 2018
- Wang, H. Q.; Guo, H. Y.; Leonard, A. W.
- Nuclear Fusion, Vol. 58, Issue 9
Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016
- Coury, M.; Guttenfelder, W.; Mikkelsen, D.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016
- Coury, M.; Guttenfelder, W.; Mikkelsen, D.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Figures / Tables found in this record: