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Hammett, G.W.; Beer, M.A.; Dorland, W.; Smith, S.A.; Cowley, S.C.
Princeton Univ., NJ (United States). Plasma Physics Lab. Funding organisation: USDOE, Washington, DC (United States)1993
Princeton Univ., NJ (United States). Plasma Physics Lab. Funding organisation: USDOE, Washington, DC (United States)1993
AbstractAbstract
[en] A status report is given on recent developments in the gyrofluid approach to simulating tokamak turbulence. ''Gyrofluid'' (or ''gyro-Landau fluid'') equations attempt to extend the range of validity of fluid equations to a more collisionless regime typical of tokamaks, by developing fluid models of important kinetic effects such as Landau-damping and gyro-orbit averaging. The fluid moments approach should converge if enough moments are kept, though this may require a large number of moments for some processes. Toroidal gyrofluid equations have been extended from 4 to 6 moments, and to include the μ ∇B magnetic mirroring force. An efficient field-line coordinate system for toroidal turbulence simulations (useful for both particle and fluid simulations) is presented. Nonlinear 3-D simulations of toroidal ITG-driven turbulence indicate that turbulence-generated sheared flows play. an important role in the development and saturation of the turbulence. There is a strong enhancement of the flows when the electrons are assumed adiabatic on each flux surface, which is partially offset by toroidal drift effects which reduce the flows
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Jun 1993; 14 p; CONTRACT AC02-76CH03073; OSTI as DE93016720; NTIS; INIS; US Govt. Printing Office Dep.
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