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(THP2/37) Self-Consistent Quasilinear Fokker-Planck - Maxwell Modelling of Ion Cyclotron Resonance Heating in Tokamak Plasmas

   
P. U. Lamalle  and D. van Eester 
 
Laboratoire de Physique des Plasmas - Laboratorium voor Plasmafysica,
EURATOM - Belgian State Association, Trilateral Euregio Cluster,
Ecole Royale Militaire - Koninklijke Militaire School, B-1000 Brussels, Belgium

Abstract
Models of the radiofrequency (rf) response and of the rf quasilinear diffusion operator of tokamak plasmas have been derived with identical approximations; they are under implementation in a full-wave code and a bounce-averaged quasilinear Fokker-Planck (QLFP) code, respectively. Combined iterative use of the codes will allow self-consistent simulations of ICRH in general tokamak geometry, with due account taken of the mutual influence between the distribution function of the heated species, which is strongly nonmaxwellian under intense ICRH, and the rf wave pattern. This first application focuses on the fundamental cyclotron interaction (i.e. typically on minority heating scenarios), transport across magnetic surfaces and finite Larmor radius effects currently being neglected. Theory and its numerical implementation are based on weak Galerkin formulations  of Maxwell's equations and of the QLFP equation. Two particularly attractive benefits result from this approach: i) the power depositions associated with each equation are automatically consistent with each other; ii) elementary building blocks common to the rf response and the QL operator are evaluated only once, yielding drastic computer time savings.

 

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IAEA 1999