Characterizing Electron Temperature Gradient Turbulence Via Numerical Simulation

Nevins, W M; Candy, J; Cowley, S; Dannert, T; Dimits, A; Dorland, W; Estrada-Mila, C; Hammett, G W; Jenko, F; Pueschel, M J; Shumaker, D E

doi:10.1063/1.2402510

Characterizing Electron Temperature Gradient Turbulence Via Numerical Simulation

Conference · Mon May 22 04:00:00 EDT 2006

DOI:https://doi.org/10.1063/1.2402510· OSTI ID:900467

Nevins, W M; Candy, J; Cowley, S; Dannert, T; Dimits, A; Dorland, W; Estrada-Mila, C; Hammett, G W; Jenko, F; Pueschel, M J; Shumaker, D E

Numerical simulations of electron temperature gradient (ETG) turbulence are presented which characterize the ETG fluctuation spectrum, establish limits to the validity of the adiabatic ion model often employed in studying ETG turbulence, and support the tentative conclusion that plasmaoperating regimes exist in which ETG turbulence produces sufficient electron heat transport to be experimentally relevant. We resolve prior controversies regarding simulation techniques and convergence by benchmarking simulations of ETG turbulence from four microturbulence codes, demonstrating agreement on the electron heat flux, correlation functions, fluctuation intensity, and rms flow shear at fixed simulation cross section and resolution in the plane perpendicular to the magnetic field. Excellent convergence of both continuum and particle-in-cell codes with time step and velocity-space resolution is demonstrated, while numerical issues relating to perpendicular (to the magnetic field) simulation dimensions and resolution are discussed. A parameter scan in the magnetic shear, s, demonstrates that the adiabatic ion model is valid at small values of s (s < 0.4 for the parameters used in this scan) but breaks down at higher magnetic shear. A proper treatment employing gyrokinetic ions reveals a steady increase in the electron heat transport with increasing magnetic shear, reaching electron heat transport rates consistent with analyses of experimental tokamak discharges.

View Conference

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 900467

Report Number(s):: UCRL-CONF-221590

Country of Publication:: United States

Language:: English

References (33)

Shearing rate of time-dependent E×B flow Hahm, T. S.; Beer, M. A.; Lin, Z. Physics of Plasmas, Vol. 6, Issue 3 https://doi.org/10.1063/1.873331	journal	March 1999
Toroidal electron temperature gradient driven drift modes Horton, W.; Hong, B. G.; Tang, W. M. Physics of Fluids, Vol. 31, Issue 10 https://doi.org/10.1063/1.866954	journal	January 1988
Numerical study of zonal flow dynamics and electron transport in electron temperature gradient driven turbulence Li, Jiquan; Kishimoto, Y. Physics of Plasmas, Vol. 11, Issue 4 https://doi.org/10.1063/1.1669397	journal	April 2004
Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes Waltz, R. E.; Kerbel, G. D.; Milovich, J. Physics of Plasmas, Vol. 1, Issue 7 https://doi.org/10.1063/1.870934	journal	July 1994
Size Scaling of Turbulent Transport in Magnetically Confined Plasmas Lin, Z.; Ethier, S.; Hahm, T. S. Physical Review Letters, Vol. 88, Issue 19 https://doi.org/10.1103/PhysRevLett.88.195004	journal	April 2002
Model for Thermal Transport in Tokamaks Guzdar, P. N.; Liu, C. S.; Dong, J. Q. Physical Review Letters, Vol. 57, Issue 22 https://doi.org/10.1103/PhysRevLett.57.2818	journal	December 1986
Poloidal Flow Driven by Ion-Temperature-Gradient Turbulence in Tokamaks Rosenbluth, M. N.; Hinton, F. L. Physical Review Letters, Vol. 80, Issue 4 https://doi.org/10.1103/PhysRevLett.80.724	journal	January 1998
Discrete particle noise in particle-in-cell simulations of plasma microturbulence Nevins, W. M.; Hammett, G. W.; Dimits, A. M. Physics of Plasmas, Vol. 12, Issue 12 https://doi.org/10.1063/1.2118729	journal	December 2005
Collisionless electron temperature gradient instability Lee, Y. C.; Dong, J. Q.; Guzdar, P. N. Physics of Fluids, Vol. 30, Issue 5 https://doi.org/10.1063/1.866248	journal	January 1987
Global profile effects and structure formations in toroidal electron temperature gradient driven turbulence Idomura, Y.; Tokuda, S.; Kishimoto, Y. Nuclear Fusion, Vol. 45, Issue 12 https://doi.org/10.1088/0029-5515/45/12/012	journal	November 2005
Zonal flows in plasma—a review Diamond, P. H.; Itoh, S-I; Itoh, K. Plasma Physics and Controlled Fusion, Vol. 47, Issue 5 https://doi.org/10.1088/0741-3335/47/5/R01	journal	April 2005
Global numerical study of electron temperature gradient-driven turbulence and transport scaling Labit, B.; Ottaviani, M. Physics of Plasmas, Vol. 10, Issue 1 https://doi.org/10.1063/1.1527942	journal	January 2003
Influence of sheared poloidal rotation on edge turbulence Biglari, H.; Diamond, P. H.; Terry, P. W. Physics of Fluids B: Plasma Physics, Vol. 2, Issue 1 https://doi.org/10.1063/1.859529	journal	January 1990
Electron temperature gradient driven turbulence Jenko, F.; Dorland, W.; Kotschenreuther, M. Physics of Plasmas, Vol. 7, Issue 5 https://doi.org/10.1063/1.874014	journal	May 2000
An Eulerian gyrokinetic-Maxwell solver Candy, J.; Waltz, R. E. Journal of Computational Physics, Vol. 186, Issue 2 https://doi.org/10.1016/S0021-9991(03)00079-2	journal	April 2003
Comparisons and physics basis of tokamak transport models and turbulence simulations Dimits, A. M.; Bateman, G.; Beer, M. A. Physics of Plasmas, Vol. 7, Issue 3 https://doi.org/10.1063/1.873896	journal	March 2000
Confinement studies of auxiliary heated NSTX plasmas LeBlanc, B. P.; Bell, R. E.; Kaye, S. M. Nuclear Fusion, Vol. 44, Issue 4 https://doi.org/10.1088/0029-5515/44/4/005	journal	March 2004
Effect of rotation on H-mode transport in DIII–D via changes in the E×B velocity shear Petty, C. C.; Wade, M. R.; Kinsey, J. E. Physics of Plasmas, Vol. 9, Issue 1 https://doi.org/10.1063/1.1421077	journal	January 2002
Electron heat transport in improved confinement discharges in DIII-D Stallard, B. W.; Greenfield, C. M.; Staebler, G. M. Physics of Plasmas, Vol. 6, Issue 5 https://doi.org/10.1063/1.873494	journal	May 1999
Scalings of Ion-Temperature-Gradient-Driven Anomalous Transport in Tokamaks Dimits, A. M.; Williams, T. J.; Byers, J. A. Physical Review Letters, Vol. 77, Issue 1 https://doi.org/10.1103/PhysRevLett.77.71	journal	July 1996
Short wavelength effects on the collisionless neoclassical polarization and residual zonal flow level Xiao, Yong; Catto, Peter J. Physics of Plasmas, Vol. 13, Issue 10 https://doi.org/10.1063/1.2358497	journal	October 2006
The numerical tokamak project: simulation of turbulent transport Cohen, B. I.; Barnes, D. C.; Dawson, J. M. Computer Physics Communications, Vol. 87, Issue 1-2 https://doi.org/10.1016/0010-4655(94)00166-Y	journal	May 1995
Role of nonlinear toroidal coupling in electron temperature gradient turbulence Lin, Z.; Chen, L.; Zonca, F. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1894766	journal	May 2005
Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices Burrell, K. H. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872367	journal	May 1997
Turbulence spreading into the linearly stable zone and transport scaling Hahm, T. S.; Diamond, P. H.; Lin, Z. Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A https://doi.org/10.1088/0741-3335/46/5A/036	journal	April 2004
The local limit of global gyrokinetic simulations Candy, J.; Waltz, R. E.; Dorland, W. Physics of Plasmas, Vol. 11, Issue 5 https://doi.org/10.1063/1.1695358	journal	May 2004
Reduced transport and E _r shearing in improved confinement regimes in JT-60U Shirai, H.; Kikuchi, M.; Takizuka, T. Nuclear Fusion, Vol. 39, Issue 11Y https://doi.org/10.1088/0029-5515/39/11Y/311	journal	November 1999
Prediction of Significant Tokamak Turbulence at Electron Gyroradius Scales Jenko, F.; Dorland, W. Physical Review Letters, Vol. 89, Issue 22 https://doi.org/10.1103/PhysRevLett.89.225001	journal	November 2002
Electron Temperature Gradient Turbulence Dorland, W.; Jenko, F.; Kotschenreuther, M. Physical Review Letters, Vol. 85, Issue 26 https://doi.org/10.1103/PhysRevLett.85.5579	journal	December 2000
Predictive modelling of JET optimized shear discharges Parail, V. V.; Baranov, Yu. F.; Challis, C. D. Nuclear Fusion, Vol. 39, Issue 3 https://doi.org/10.1088/0029-5515/39/3/310	journal	March 1999
Radial and zonal modes in hyperfine-scale stellarator turbulence Jenko, F.; Kendl, A. Physics of Plasmas, Vol. 9, Issue 10 https://doi.org/10.1063/1.1507591	journal	October 2002
Dynamics of large-scale structure and electron transport in tokamak microturbulence simulations Li, J. Q.; Kishimoto, Y.; Miyato, N. Nuclear Fusion, Vol. 45, Issue 11 https://doi.org/10.1088/0029-5515/45/11/010	journal	October 2005
Gyrokinetic turbulence simulation of profile shear stabilization and broken gyroBohm scaling Waltz, R. E.; Candy, J. M.; Rosenbluth, M. N. Physics of Plasmas, Vol. 9, Issue 5 https://doi.org/10.1063/1.1448830	journal	May 2002

Similar Records

Characterizing electron temperature gradient turbulence via numerical simulation

Journal Article · Thu Dec 14 23:00:00 EST 2006 · Physics of Plasmas · OSTI ID:20860430

Resolving electron scale turbulence in spherical tokamaks with flow shear

Journal Article · Mon Feb 14 23:00:00 EST 2011 · Physics of Plasmas · OSTI ID:21535167

Relating Gyrokinetic Electron Turbulence to Plasma Confinement in the National Spherical Torus Experiment

Thesis/Dissertation · Tue Nov 01 00:00:00 EDT 2011 · OSTI ID:1365790

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONVERGENCE
CORRELATION FUNCTIONS
CROSS SECTIONS
DIMENSIONS
ELECTRON TEMPERATURE
ELECTRONS
FLUCTUATIONS
HEAT FLUX
MAGNETIC FIELDS
RESOLUTION
SHEAR
SIMULATION
TRANSPORT
TURBULENCE

Characterizing Electron Temperature Gradient Turbulence Via Numerical Simulation

Citation Formats

References (33)

Similar Records

Related Subjects