Evidence from past recent years show regions in the plasma, where 2nd harmonic X-mode (X2) waves are prone to non-linear wave interactions, known as parametric decay instabilities (PDI). These have been observed in tokamaks, such as ASDEX-U and TCV, and in the stellarator, Wendelstein 7-X. In this study, a numerical research of growth rates for PDI is carried out for linear plasma device...
We report an analytical model for nonlinear collisionless electron cyclotron (EC) heating, accounting for electrons with non-zero initial perpendicular energy and high pitch angle under the 2nd harmonic, X-mode, perpendicular injection conditions with the help of the adiabatic Hamiltonian formulation [1]. During the tokamak pre-ionization stage, such electrons are expected to be present due to...
