MAGNETIC-FIELD LINE HAMILTONIANS FOR SOME PERTURBED MHD EQUILIBRIA INCYLINDRICAL GEOMETRY

The magnetic field line equations for an axisymmetric plasma confining system can be cast in a hamiltonian form, We apply a general procedur e for this analogy in the case of cylindrical symmetry and use the res ult in order to describe two typical MHD equilibria. The case of a gen eral, nonintegrable perturbation is considered, resonances being treat ed with use of secular perturbation theory. We study the magnetic isla nd formation near these resonances.