Coherent high-frequency axial oscillations in a partially magnetized direct current magnetron discharge

Coherent high-frequency axial oscillations in a partially magnetized direct current magnetron discharge

High frequency oscillations are observed in a neon plasma of a direct current magnetron discharge. At low discharge currents, we see highly coherent 60 MHz fluctuations. Above a distinct current threshold, secondary 5 - 10 MHz fluctuations emerge in addition to turbulent fluctuations in the 60 - 100...

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Veröffentlicht in:arXiv.org 2024-05
Hauptverfasser: Przybocki, Ryan C, Cappelli, Mark A
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Axial modes
Direct current
Discharge
High frequencies
Neon
Oscillations
Spokes
Turbulence
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description High frequency oscillations are observed in a neon plasma of a direct current magnetron discharge. At low discharge currents, we see highly coherent 60 MHz fluctuations. Above a distinct current threshold, secondary 5 - 10 MHz fluctuations emerge in addition to turbulent fluctuations in the 60 - 100 MHz 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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subjects Axial modes
Direct current
Discharge
High frequencies
Neon
Oscillations
Spokes
Turbulence
title Coherent high-frequency axial oscillations in a partially magnetized direct current magnetron discharge
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