22nd joint workshop on electron cyclotron emission (ECE) and electron cyclotron resonance heating (ECRH)

Session

Theory (Oral)

22 Apr 2024, 13:30

Royal Ball Room (Ramada Hotel, Daejeon, Republic of Korea)

52. Two-plasmon decay of microwaves in low temperature magnetized laboratory plasmas

Mr Johan Kølsen de Wit (Department of Physics, Technical University of Denmark, Fysikvej, DK-2800 Kgs. Lyngby, Denmark)

22/04/2024, 14:00

Theory

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...

71. Modelling of nonlinear collisionless electron cyclotron heating for the tokamak pre-ionization

Jinwoo Gwak (Seoul National University)

22/04/2024, 14:20

Theory

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...