PPPL-3349 is available in pdf or postscript formats.

Small-Action Resonance in Hamiltonian Systems and Redistribution of Energetic Ions in Tokamaks

Authors: Yu.V. Yakovenko, Ya.I. Kolesnichenko, V.V. Lutsenko, and R.B. White

Date: May 27, 1999

It has been found that an arbitrary small perturbation in an integrable Hamiltonian system typically leads to driven resonance in the regions of the phase space where at least one of the action variables is sufficiently small. In particular, such a small-action resonance is shown to play a dominant role in the sawtooth-crash-induced disappearance of a strongly localized gamma-ray and neutron emitting region in a tokamak plasma, which was observed experimentally.