The effect of magnetic flutter on residual flow
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
The hypothesis that stochastic magnetic fields disrupt zonal flows associated with ion temperature gradient turbulence saturation is investigated analytically with a residual flow calculation in the presence of magnetic flutter. The calculation starts from the time-asymptotic zero-beta residual flow of Rosenbluth and Hinton [Phys. Rev. Lett. 80, 724 (1998)] with the sudden application of an externally imposed, fixed magnetic field perturbation. The short-time electron response from radial charge loss due to magnetic flutter is calculated from the appropriate gyrokinetic equation. The potential evolution has quadratic behavior, with a zero crossing at finite time. The crossing time and its parametric dependencies are compared with numerical results from a gyrokinetic simulation of residual flow in the presence of magnetic flutter. The numerical and analytical results are in good agreement and support the hypothesis that the high-beta runaway of numerical simulations is a result of the disabling of zonal flows by finite-beta charge losses associated with magnetic flutter.
- OSTI ID:
- 22218422
- Journal Information:
- Physics of Plasmas, Vol. 20, Issue 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASYMPTOTIC SOLUTIONS
CHARGED-PARTICLE TRANSPORT
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DISTURBANCES
ELECTRONS
HIGH-BETA PLASMA
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
NUMERICAL ANALYSIS
PLASMA POTENTIAL
PLASMA SIMULATION
STOCHASTIC PROCESSES
TEMPERATURE GRADIENTS
TURBULENCE