Nonmagnetohydrodynamic effects, caused by a minority population of energetic particles and/or by the large gyroradii of the main ion population, strongly modify the stability of a high temperature toroidal plasma against m = 1 internal modes. It is shown that the enhanced stability due to the presence of the energetic particles is reduced in the large gyroradius regime, where the width of the transition layer of the mode is determined by the gyroradius of the main ions. This modification results from the presence of a discrete spectrum of resistively damped Alfven-type modes which can be destabilized through the resonance with the energetic particles.
LARGE GYRORADIUS M=1 ALFVEN MODES AND ENERGETIC PARTICLES
PEGORARO, FRANCESCO;
1991
Abstract
Nonmagnetohydrodynamic effects, caused by a minority population of energetic particles and/or by the large gyroradii of the main ion population, strongly modify the stability of a high temperature toroidal plasma against m = 1 internal modes. It is shown that the enhanced stability due to the presence of the energetic particles is reduced in the large gyroradius regime, where the width of the transition layer of the mode is determined by the gyroradius of the main ions. This modification results from the presence of a discrete spectrum of resistively damped Alfven-type modes which can be destabilized through the resonance with the energetic particles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
