On the definition of a kinetic equilibrium in global gyrokinetic simulations

Nonlinear electrostatic global gyrokinetic simulations of collisionless ion temperature gradient (ITG) turbulence and ExB zonal flows in axisymmetric toroidal plasmas are examined for different choices of the initial distribution function. Using a local Maxwellian leads to the generation of axisymmetric ExB flows that can be so strong as to prevent ITG mode growth. A method using a canonical Maxwellian is shown to avoid this spurious generation of ExB flows. In addition, a revised delta f scheme is introduced and compared to the standard delta f method. (c) 2006 American Institute of Physics.


Published in:
Physics of Plasmas, 13, 5
Year:
2006
Publisher:
American Institute of Physics
ISSN:
1070-664X
ISBN:
1070-664X
Other identifiers:
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-09-13

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