Low Threshold Parametric Decay Back Scattering Instability in Tokamak ECRH Experiments

Details Low Threshold Parametric Decay Back Scattering Instability in Tokamak ECRH Experiments Low Threshold Parametric Decay Back Scattering Instability in Tokamak ECRH Experiments

2010-05-16

arxiv.org/abs/1005.2747v1

Physics

Plasma Physics

7 pages, 4 figures

Scientific paper

The experimental conditions leading to substantial reduction of backscattering decay instability threshold in ECRH experiments in toroidal devices are analyzed. It is shown that drastic decrease of threshold is provided by non monotonic behavior of plasma density in the vicinity of magnetic island and poloidal magnetic field inhomogeneity making possible localization of ion Bernstein decay waves. The corresponding ion Bernstein wave gain and the parametric decay instability pump power threshold is calculated.

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