Abstract

High-frequency oscillations are observed in a neon plasma of a direct current magnetron discharge. At low discharge currents, we see highly coherent 60MHz fluctuations. Above a distinct current threshold, secondary 5-10MHz fluctuations emerge in addition to turbulent fluctuations in the 60-100MHz range. The oscillations in the total discharge current suggest axial wave propagation. A lower-hybrid wave theory is invoked to model the high-frequency oscillations. We attribute the low-frequency modes to a turbulence-driven inverse cascade process, as suggested by recent simulations.

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