Theory of fine-scale zonal flow generation
POSTER
Abstract
Most zonal flow generation theory has been built upon drift wave turbulence with a usual assumption of $q_r \rho _{i\theta } <<1$ [Diamond et al., IAEA-CN-69/TH3/1 (1998), Chen et al., Phys. Plasma 7, 3129 (2000)]. However, recent nonlinear GTC simulations of trapped electron mode (TEM) turbulence exhibit a relatively short radial scale of the zonal flows with $q_r \rho_{i\theta} \sim 1$[Z. Lin et al., IAEA-CN/TH/8-4 (2004)]. This work reports an extension of zonal flow growth calculation via the wave kinetics approach to this short wavelength regime. A generalized expression for the neoclassical polarization shielding [Rosenbluth and Hinton, Phys. Rev. Lett. 80, 724 (1998)] comes from the modern bounce-kinetic equation [Fong and Hahm, Phys. Plasmas 6, 188 (1999)].
Authors
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Lu Wang
Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA
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T.S. Hahm
Princeton University, Plasma Physics Laboratory, Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA, Princeton Plasma Physics Laboratory