JET-P(89)41
Plasma Modes, Periodicity and Symplectic Structure
A group theoretical formulation of the so-called "ballooning" or "extended variable"; representation, commonly adopted for the study of the linear eigenmodes of short wavelength excitations in a toroidal, axisymmetric electromagnetic plasma, is presented. With the help of this novel formulation, this representation is generalised so as to include the non-linear evolution of the excitations.