In the framework of the study of parametric instabilities involving lower hybrid wave propagation in a magnetized plasma, this work presents a new nonlinear parametric dispersion equation, based on a kinetic model, taking into account the collisional effects, useful to analyze the instabilities emerging in the outer layers of a tokamak plasma. For typical parameters of present day LHCD experiments, we compare the numerical solutions of the full parametric dispersion equation in collisionless plasma with the numerical solutions obtained in both collisional and collisionless case, considering only the particle dynamics parallel to the equilibrium magnetic field. The role of the electron temperature and the ion composition are also investigated in order to find outer plasma conditions useful to suppress the parametric instabilities in future fusion reactor scenarios. © 2017 IOP Publishing Ltd.
Suppression of parametric instabilities induced by lower hybrid waves
Napoli, F.;Castaldo, C.
2017-01-01
Abstract
In the framework of the study of parametric instabilities involving lower hybrid wave propagation in a magnetized plasma, this work presents a new nonlinear parametric dispersion equation, based on a kinetic model, taking into account the collisional effects, useful to analyze the instabilities emerging in the outer layers of a tokamak plasma. For typical parameters of present day LHCD experiments, we compare the numerical solutions of the full parametric dispersion equation in collisionless plasma with the numerical solutions obtained in both collisional and collisionless case, considering only the particle dynamics parallel to the equilibrium magnetic field. The role of the electron temperature and the ion composition are also investigated in order to find outer plasma conditions useful to suppress the parametric instabilities in future fusion reactor scenarios. © 2017 IOP Publishing Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
