Physics of Plasmas
Feedback | Help | Exit
Physics of Plasmas
   
 
 
 
Previous Article
On the nature of radial transport across sheared zonal flows in electrostatic ion-temperature-gradient gyrokinetic tokamak plasma turbulence
It is argued that the usual understanding of the suppression of radial turbulent transport across a sheared zonal flow based on a reduction in effective transport coefficients is, by itself, incomplet...
Next Article
Turbulence-driven zonal flows in helical systems with radial electric fields
Collisionless long-time responses of the zonal-flow potential to the initial condition and turbulence source in helical systems having radial electric fields are derived theoretically. All classes of ...

Role of zonal flows in trapped electron mode turbulence through nonlinear gyrokinetic particle and continuum simulation

Phys. Plasmas 16, 055906 (2009); doi:10.1063/1.3116282

Published 15 May 2009

You are not logged in to this journal. Log in

D. R. Ernst,1 J. Lang,2 W. M. Nevins,3 M. Hoffman,4 Y. Chen,2 W. Dorland,5 and S. Parker2
1Plasma Science and Fusion Center, Massachusetts Institute of Technology, 167 Albany Street, NW16-258, Cambridge, Massachusetts 02139, USA
2Center for Integrated Plasma Studies, University of Colorado, Boulder, Colorado 80309, USA
3Lawrence Livermore National Laboratory, Livermore, California 94551, USA
4Department of Physics and Department of Nuclear Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
5Department of Physics, Institute for Research in Electronics and Applied Physics, and Center for Scientific Computation and Mathematical Modelling, University of Maryland, College Park, Maryland 20742, USA
Trapped electron mode (TEM) turbulence exhibits a rich variety of collisional and zonal flow physics. This work explores the parametric variation of zonal flows and underlying mechanisms through a series of linear and nonlinear gyrokinetic simulations, using both particle-in-cell and continuum methods. A new stability diagram for electron modes is presented, identifying a critical boundary at etae=1, separating long and short wavelength TEMs. A novel parity test is used to separate TEMs from electron temperature gradient driven modes. A nonlinear scan of etae reveals fine scale structure for etae>~1, consistent with linear expectation. For etae<1, zonal flows are the dominant saturation mechanism, and TEM transport is insensitive to etae. For etae>1, zonal flows are weak, and TEM transport falls inversely with a power law in etae. The role of zonal flows appears to be connected to linear stability properties. Particle and continuum methods are compared in detail over a range of etae=d ln Te/d ln ne values from zero to five. Linear growth rate spectra, transport fluxes, fluctuation wavelength spectra, zonal flow shearing spectra, and correlation lengths and times are in close agreement. In addition to identifying the critical parameter etae for TEM zonal flows, this paper takes a challenging step in code verification, directly comparing very different methods of simulating simultaneous kinetic electron and ion dynamics in TEM turbulence. ©2009 American Institute of Physics
History: Received 6 January 2009; accepted 23 January 2009; published 15 May 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/055906/1
BUY THIS ARTICLE   (US$28)
Download PDF (825 kB) View Cart

KEYWORDS and PACS

Keywords
PACS
  • 52.25.Fi
    Plasma transport properties
  • 52.25.Vy
    Impurities in plasmas
  • 52.30.Gz
    Gyrokinetics in plasmas
  • 52.35.Kt
    Plasma drift waves
  • 52.35.Ra
    Plasma turbulence
  • 52.50.Qt
    Plasma heating by radio-frequency fields
  • 52.55.Dy
    General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc
  • 52.55.Fa
    Tokamaks
  • 52.65.Tt
    Gyrofluid and gyrokinetic plasma simulations
  • YEAR: 2009

RELATED DATABASES


To view database links for this article,
you need to log in.
To view database links for this article,
you need to log in.

PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (28)
View in Separate Window/Tab
For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.
  1. ITER Physics Expert Group on Confinement and Transport, ITER Physics Expert Group on Confinement Modelling and Database, ITER Physics Basis Editors, and Nucl. Fusion 39, 2175 (1999).
  2. C. Angioni, L. Carraro, T. Dannert, N. Dubuit, R. Dux, C. Fuchs, X. Garbet, L. Garzotti, C. Giroud, R. Guirlet, F. Jenko, O. J. W. F. Kardaun, L. Lauro-Taroni, P. Mantica, M. Maslov, V. Naulin, R. Neu, A. G. Peeters, G. Pereverzev, M. E. Puiatti, T. Pütterich, J. Stober, M. Valovič, M. Valisa, H. Weisen, A. Zabolotsky, ASDEX Upgrade Team, JET EFDA Contributors, and Phys. Plasmas 14, 055905 (2007).
  3. T. L. Rhodes, W. A. Peebles, J. C. DeBoo, R. Prater, J. E. Kinsey, G. M. Staebler, J. Candy, M. E. Austin, R. V. Bravenec, K. H. Burrell, J. S. deGrassie, E. J. Doyle, P. Gohil, C. M. Greenfield, R. J. Groebner, J. Lohr, M. A. Makowski, X. V. Nguyen, C. C. Petty, W. M. Solomon, H. E. St. John, M. A. Van Zeeland, G. Wang, and L. Zeng, Plasma Phys. Controlled Fusion 49, B183 (2007).
  4. I. H. Hutchinson, R. Boivin, F. Bombarda, P. Bonoli, S. Fairfax, C. Fiore, J. Goetz, S. Golovato, R. Granetz, M. Greenwald, S. Horne, A. Hubbard, J. Irby, B. LaBombard, B. Lipschultz, E. Marmar, G. McCracken, M. Porkolab, J. Rice, J. Snipes, Y. Takase, J. Terry, S. Wolfe, C. Christensen, D. Garnier, M. Graf, T. Hsu, T. Luke, M. May, A. Niemczewski, G. Tinios, J. Schachter, and J. Urbahn, Phys. Plasmas 1, 1511 (1994).
  5. D. R. Ernst, P. T. Bonoli, P. J. Catto, W. Dorland, C. L. Fiore, R. S. Granetz, M. Greenwald, A. E. Hubbard, M. Porkolab, M. H. Redi, J. E. Rice, K. Zhurovich, and Alcator C-Mod Group, Phys. Plasmas 11, 2637 (2004).
  6. D. R. Ernst, N. Basse, W. Dorland, C. L. Fiore, L. Lin, A. Long, M. Porkolab, K. Zeller, and K. Zhurovich, Proceedings of the 21st International Atomic Energy Agency Fusion Energy Conference, Chengdu, China, 2006 (International Atomic Energy Agency, Vienna, 2007), Paper No. IAEA-CN-149/TH/1-3; available at http://www-pub.iaea.org/MTCD/Meetings/FEC2006/th_1-3.pdf.
  7. T. Dannert and F. Jenko, Phys. Plasmas 12, 072309 (2005).
  8. J. Lang, Y. Chen, and S. E. Parker, Phys. Plasmas 14, 082315 (2007).
  9. M. Hoffman and D. R. Ernst, Bull. Am. Phys. Soc. 52, 16 (2007).
  10. J. Lang, Y. Chen, and S. E. Parker, Phys. Plasmas 15, 055907 (2008).
  11. J. Anderson, H. Nordmann, R. Singh, and J. Weiland, Plasma Phys. Controlled Fusion 48, 651 (2006).
  12. P. W. Terry, R. Gatto, and D. A. Baver, Phys. Rev. Lett. 89, 205001 (2002).
  13. D. A. Baver, P. W. Terry, and R. A. Gatto, Phys. Plasmas 9, 3318 (2002).
  14. R. Gatto, P. W. Terry, and D. A. Baver, Phys. Plasmas 13, 022306 (2006).
  15. L. Chen, Z. Lin, and R. White, Phys. Plasmas 7, 3129 (2000).
  16. B. N. Rogers, W. Dorland, and M. Kotschenreuther, Phys. Rev. Lett. 85, 5336 (2000).
  17. P. H. Diamond, S. -I. Itoh, K. Itoh, and T. S. Hahm, Plasma Phys. Controlled Fusion 47, R35 (2005).
  18. F. Merz and F. Jenko, Phys. Rev. Lett. 100, 035005 (2008).
  19. J. Li and Y. Kishimoto, Plasma Phys. Controlled Fusion 44, A479 (2002).
  20. A. M. Dimits, G. Bateman, M. A. Beer, B. I. Cohen, W. Dorland, G. W. Hammett, C. Kim, J. E. Kinsey, M. Kotschenreuther, A. H. Kritz, L. L. Lao, J. Mandrekas, W. M. Nevins, S. E. Parker, A. J. Redd, D. E. Shumaker, R. Sydora, and J. Weiland, Phys. Plasmas 7, 969 (2000).
  21. W. D. Dorland, F. Jenko, M. Kotschenreuther, and B. N. Rogers, Phys. Rev. Lett. 85, 5579 (2000).
  22. Y. Chen and S. E. Parker, J. Comput. Phys. 189, 463 (2003).
  23. B. Coppi and F. Pegoraro, Nucl. Fusion 17, 969 (1977).
  24. B. Coppi and G. Rewoldt, Phys. Rev. Lett. 33, 1329 (1974).
  25. B. Coppi, S. Migliuolo, and Y. -K. Pu, Phys. Fluids B 2, 2322 (1990).
  26. J. Candy and R. E. Waltz, J. Comput. Phys. 186, 545 (2003).
  27. W. M. Nevins, J. Candy, S. Cowley, T. Dannert, A. Dimits, W. Dorland, C. Estrada-Mila, G. W. Hammett, F. Jenko, M. J. Pueschel, and D. E. Shumaker, Phys. Plasmas 13, 122306 (2006).
  28. Y. Xiao and P. J. Catto, Phys. Plasmas 13, 102311 (2006).

CITING ARTICLES
For access to citing articles, you need to log in.
For access to citing articles, you need to Log in.


Copyright © American Institute of Physics