Parallel electron force balance and the L-H transition
Abstract
In one popular paradigm for the L-H transition, energy transfer to the mean flows directly depletes turbulence fluctuation energy, resulting in suppression of the turbulence and a corresponding transport bifurcation. To quantitatively evaluate this mechanism, one must remember that electron parallel force balance couples nonzonal velocity fluctuations with electron pressure fluctuations on rapid timescales, comparable with the electron transit time. For this reason, energy in the nonzonal velocity stays in a fairly fixed ratio to the free energy in electron density fluctuations, at least for frequency scales much slower than electron transit. Furthermore, in order for direct depletion of the energy in turbulent fluctuations to cause the L-H transition, energy transfer via Reynolds stress must therefore drain enough energy to significantly reduce the sum of the free energy in nonzonal velocities and electron pressure fluctuations. At low k⊥, the electron thermal free energy is much larger than the energy in nonzonal velocities, posing a stark challenge for this model of the L-H transition.
- Authors:
-
- Princeton Univ., Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1303849
- Alternate Identifier(s):
- OSTI ID: 1254197
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; 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; energy transfer; free energy; Reynolds stress modeling; shear flows; turbulence effects
Citation Formats
Stoltzfus-Dueck, T. Parallel electron force balance and the L-H transition. United States: N. p., 2016.
Web. doi:10.1063/1.4951015.
Stoltzfus-Dueck, T. Parallel electron force balance and the L-H transition. United States. https://doi.org/10.1063/1.4951015
Stoltzfus-Dueck, T. Mon .
"Parallel electron force balance and the L-H transition". United States. https://doi.org/10.1063/1.4951015. https://www.osti.gov/servlets/purl/1303849.
@article{osti_1303849,
title = {Parallel electron force balance and the L-H transition},
author = {Stoltzfus-Dueck, T.},
abstractNote = {In one popular paradigm for the L-H transition, energy transfer to the mean flows directly depletes turbulence fluctuation energy, resulting in suppression of the turbulence and a corresponding transport bifurcation. To quantitatively evaluate this mechanism, one must remember that electron parallel force balance couples nonzonal velocity fluctuations with electron pressure fluctuations on rapid timescales, comparable with the electron transit time. For this reason, energy in the nonzonal velocity stays in a fairly fixed ratio to the free energy in electron density fluctuations, at least for frequency scales much slower than electron transit. Furthermore, in order for direct depletion of the energy in turbulent fluctuations to cause the L-H transition, energy transfer via Reynolds stress must therefore drain enough energy to significantly reduce the sum of the free energy in nonzonal velocities and electron pressure fluctuations. At low k⊥, the electron thermal free energy is much larger than the energy in nonzonal velocities, posing a stark challenge for this model of the L-H transition.},
doi = {10.1063/1.4951015},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {Mon May 23 00:00:00 EDT 2016},
month = {Mon May 23 00:00:00 EDT 2016}
}
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Works referenced in this record:
A review of theories of the L-H transition
journal, December 1999
- Connor, J. W.; Wilson, H. R.
- Plasma Physics and Controlled Fusion, Vol. 42, Issue 1
A quarter-century of H-mode studies
journal, November 2007
- Wagner, F.
- Plasma Physics and Controlled Fusion, Vol. 49, Issue 12B
Influence of sheared poloidal rotation on edge turbulence
journal, January 1990
- Biglari, H.; Diamond, P. H.; Terry, P. W.
- Physics of Fluids B: Plasma Physics, Vol. 2, Issue 1
Self-Regulating Shear Flow Turbulence: A Paradigm for the L to H Transition
journal, April 1994
- Diamond, P. H.; Liang, Y. -M.; Carreras, B. A.
- Physical Review Letters, Vol. 72, Issue 16
Zonal flow production in the L–H transition in Alcator C-Mod
journal, May 2014
- Cziegler, I.; Tynan, G. R.; Diamond, P. H.
- Plasma Physics and Controlled Fusion, Vol. 56, Issue 7
Recent progress towards a physics-based understanding of the H-mode transition
journal, January 2016
- Tynan, G. R.; Cziegler, I.; Diamond, P. H.
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 4
Plasma Edge Turbulence
journal, February 1983
- Hasegawa, Akira; Wakatani, Masahiro
- Physical Review Letters, Vol. 50, Issue 9
Computation of electromagnetic turbulence and anomalous transport mechanisms in tokamak plasmas
journal, November 2003
- Scott, Bruce D.
- Plasma Physics and Controlled Fusion, Vol. 45, Issue 12A
Advances in the simulation of toroidal gyro‐Landau fluid model turbulence
journal, June 1995
- Waltz, R. E.; Kerbel, G. D.; Milovich, J.
- Physics of Plasmas, Vol. 2, Issue 6
Nonadiabatic electron response in the Hasegawa-Wakatani equations
journal, August 2013
- Stoltzfus-Dueck, T.; Scott, B. D.; Krommes, J. A.
- Physics of Plasmas, Vol. 20, Issue 8
Parallel electron force balance and the L-H transition
dataset, January 2016
- Stotlzfus-Dueck, T.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Parallel electron force balance and the L-H transition
dataset, January 2016
- Stoltzfus-Dueck, T.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Parallel electron force balance and the L-H transition
dataset, January 2016
- Stoltzfus-Dueck, T.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Parallel electron force balance and the L-H transition
dataset, January 2016
- Stotlzfus-Dueck, T.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Works referencing / citing this record:
Intrinsic rotation in axisymmetric devices
journal, November 2019
- Stoltzfus-Dueck, T.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 12
Parallel electron force balance and the L-H transition
dataset, January 2016
- Stotlzfus-Dueck, T.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Parallel electron force balance and the L-H transition
dataset, January 2016
- Stoltzfus-Dueck, T.
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)