Abstract
A variational method is presented in order to determine and study linear microinstabilities in tokamaks. Exploiting the existence of a system of action and angular variables for trapped and circulating particles, a functional, extremum in the turbulent electromagnetic field, is analytically established and implemented in the code TORRID. The coupling of poloidal harmonics due to toroidal effects is investigated within the frame of a WKB formalism whose zeroth order is equivalent to the ballooning analysis. The essential features of the code TORRID are described. Curvature effects on ionic modes profiles and stability thresholds are presented as an example of application.
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