Particle-in-cell simulations of parametric decay instabilities near the upper hybrid layer
Department of Physics, Technical University of Denmark , Fysikvej, DK-2800 Kgs. Lyngby, Denmark
2 York Plasma Institute, Department of Physics, University of York, York YO10 5DD United Kingdom
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Published online: 25 March 2019
The particle-in-cell (PIC) code EPOCH is used to simulate parametric decay instabilities (PDIs) converting a 105 GHz microwave X-mode pump wave into electrostatic daughter waves at the upper hybrid (UH) layer of a fusion plasma in 1D. The resulting ﬁelds are analyzed, identifying modes in f -and k-space, and estimating their spectral power as a function of pump wave intensity. Both linearly and nonlinearly converted modes are identiﬁed and their characteristics agree with literature. A dipole approximation employed in literature appears to be unjust.
© The Authors, published by EDP Sciences, 2019
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