Abstract
Parametric decay instability near the upper hybrid resonance and anomalous mm-wave scattering in tokamak and stellarator plasmas
Highlights
Introduction and BackgroundThe parametric decay instability (PDI) is results from a three-wave interaction in which an incident wave decays into two daughter waves
In this work we focus on parametric decay of an electromagnetic pump wave into two electrostatic daughter waves, an X-mode pump wave decaying into a high-frequency warm upper hybrid (UH) wave and a low-frequency warm lower hybrid (LH)
Where ωUH2 = ωpe2 + ωce2 is the square of the UH frequency, ωLH2 = ωce2ωpi2/ωUH2 is the square of the LH frequency, be1,2 = meTek1,22/(e2B2) is the square of the wave number normalised by the inverse square of the thermal electron
Summary
Introduction and BackgroundThe parametric decay instability (PDI) is results from a three-wave interaction in which an incident (pump) wave decays into two daughter waves. PDIs result in frequency-shifted radiation which interferes with mm-wave plasma diagnostics such as electron cyclotron emission (ECE) or collective Thomson scattering (CTS).
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