K. Molvig

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Neoclassical transport theory is developed in a Lagrangian formulation, in contrast to the usual Eulerian development. The Lagrangian formulation is constructed from the three actions: magnetic moment, parallel invariant, and bounce averaged poloidal flux. By averaging over the fast orbital time scales an equation in the actions alone of the Fokker-Planck(More)
A derivation and approximate solution of renormalized mode coupling equations describing the turbulent drift wave spectrum is presented. Arguments are given which indicate that a weak turbulence formulation of the spectrum equations fails for a system with negative dissipation. The inadequacy of the weak turbulence theory is circumvented by utilizing a(More)
Zonal ‡ow helps reduce and control the level of ion temperature gradient (ITG) turbulence in a tokamak. The collisional damping of zonal ‡ow has been estimated by Hinton and Rosenbluth (H-R). Their calculation shows that the damping of zonal ‡ow is closely related to the frequency response of neoclassical polarization of the plasma. Based on a variational(More)
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